Loans and allowance for credit losses - Credit Quality Indicators by Class of Financing Receivable (Details) - USD ($)
$ in Thousands |
Dec. 31, 2020 |
Jan. 01, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
$ 4,352,490
|
|
| Loans |
$ 7,082,959
|
$ 4,409,642
|
4,409,642
|
$ 3,667,511
|
| Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
57,152
|
|
| Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
4,143,116
|
|
| Loans |
6,586,216
|
|
4,143,116
|
|
| Pass | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
142,511
|
|
| Loans |
364,520
|
|
186,180
|
|
| Watch | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
43,669
|
|
| Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
66,863
|
|
| Loans |
129,073
|
|
80,346
|
|
| Substandard | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
13,483
|
|
| Commercial and industrial |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
1,032,352
|
|
| Loans |
1,346,122
|
|
1,034,036
|
867,083
|
| Commercial and industrial | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
1,684
|
|
| Commercial and industrial | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
946,247
|
|
| Loans |
1,238,409
|
|
|
|
| Commercial and industrial | Pass | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Commercial and industrial | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
66,910
|
|
| Loans |
68,367
|
|
|
|
| Commercial and industrial | Watch | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
1,224
|
|
| Commercial and industrial | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
19,195
|
|
| Loans |
39,146
|
|
|
|
| Commercial and industrial | Substandard | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
460
|
|
| Construction |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
548,217
|
|
| Loans |
1,222,220
|
|
551,101
|
556,051
|
| Construction | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
2,884
|
|
| Construction | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
541,201
|
|
| Loans |
1,178,821
|
|
|
|
| Construction | Pass | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Construction | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
4,790
|
|
| Loans |
34,684
|
|
|
|
| Construction | Watch | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
2,681
|
|
| Construction | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
2,226
|
|
| Loans |
8,703
|
|
|
|
| Construction | Substandard | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
203
|
|
| Residential real estate | 1-to-4 family mortgage |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
691,116
|
|
| Loans |
1,089,270
|
|
710,454
|
555,815
|
| Residential real estate | 1-to-4 family mortgage | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
19,338
|
|
| Residential real estate | 1-to-4 family mortgage | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
666,177
|
|
| Loans |
1,025,911
|
|
|
|
| Residential real estate | 1-to-4 family mortgage | Pass | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Residential real estate | 1-to-4 family mortgage | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
11,380
|
|
| Loans |
39,182
|
|
|
|
| Residential real estate | 1-to-4 family mortgage | Watch | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
15,091
|
|
| Residential real estate | 1-to-4 family mortgage | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
13,559
|
|
| Loans |
23,591
|
|
|
|
| Residential real estate | 1-to-4 family mortgage | Substandard | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
4,247
|
|
| Residential real estate | Residential line of credit |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
221,457
|
|
| Loans |
408,211
|
|
221,530
|
190,480
|
| Residential real estate | Residential line of credit | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
73
|
|
| Residential real estate | Residential line of credit | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
218,086
|
|
| Loans |
396,348
|
|
|
|
| Residential real estate | Residential line of credit | Pass | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Residential real estate | Residential line of credit | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
1,343
|
|
| Loans |
6,511
|
|
|
|
| Residential real estate | Residential line of credit | Watch | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Residential real estate | Residential line of credit | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
2,028
|
|
| Loans |
4,756
|
|
|
|
| Residential real estate | Residential line of credit | Substandard | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
73
|
|
| Residential real estate | Multi-family mortgage |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
69,429
|
|
| Loans |
175,676
|
|
69,429
|
75,457
|
| Residential real estate | Multi-family mortgage | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Residential real estate | Multi-family mortgage | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
69,366
|
|
| Loans |
175,619
|
|
|
|
| Residential real estate | Multi-family mortgage | Pass | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Residential real estate | Multi-family mortgage | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
63
|
|
| Loans |
0
|
|
|
|
| Residential real estate | Multi-family mortgage | Watch | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Residential real estate | Multi-family mortgage | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
0
|
|
| Loans |
57
|
|
|
|
| Residential real estate | Multi-family mortgage | Substandard | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Residential real estate | Non-owner occupied |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
1,598,979
|
|
|
|
| Residential real estate | Non-owner occupied | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
1,448,084
|
|
|
|
| Residential real estate | Non-owner occupied | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
130,100
|
|
|
|
| Residential real estate | Non-owner occupied | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
20,795
|
|
|
|
| Commercial real estate |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
924,841
|
|
|
|
| Commercial real estate | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
828,223
|
|
|
|
| Commercial real estate | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
70,059
|
|
|
|
| Commercial real estate | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
26,559
|
|
|
|
| Commercial real estate | Owner occupied |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
624,379
|
|
| Loans |
924,841
|
|
630,270
|
493,524
|
| Commercial real estate | Owner occupied | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
5,891
|
|
| Commercial real estate | Owner occupied | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
576,737
|
|
| Commercial real estate | Owner occupied | Pass | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Commercial real estate | Owner occupied | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
30,379
|
|
| Commercial real estate | Owner occupied | Watch | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
4,535
|
|
| Commercial real estate | Owner occupied | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
17,263
|
|
| Commercial real estate | Owner occupied | Substandard | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
1,356
|
|
| Commercial real estate | Non-owner occupied |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
910,547
|
|
| Loans |
1,598,979
|
|
920,744
|
700,248
|
| Commercial real estate | Non-owner occupied | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
10,197
|
|
| Commercial real estate | Non-owner occupied | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
876,670
|
|
| Commercial real estate | Non-owner occupied | Pass | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Commercial real estate | Non-owner occupied | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
24,342
|
|
| Commercial real estate | Non-owner occupied | Watch | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
6,617
|
|
| Commercial real estate | Non-owner occupied | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
9,535
|
|
| Commercial real estate | Non-owner occupied | Substandard | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
3,580
|
|
| Consumer and other |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
254,993
|
|
| Loans |
317,640
|
|
272,078
|
$ 228,853
|
| Consumer and other | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
17,085
|
|
| Consumer and other | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
248,632
|
|
| Loans |
294,801
|
|
|
|
| Consumer and other | Pass | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
0
|
|
| Consumer and other | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
3,304
|
|
| Loans |
15,617
|
|
|
|
| Consumer and other | Watch | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
13,521
|
|
| Consumer and other | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Total loans, excluding purchased credit impaired loans |
|
|
3,057
|
|
| Loans |
$ 5,466
|
|
|
|
| Consumer and other | Substandard | Purchased Credit Impaired loans |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
|
|
$ 3,564
|
|