Loans and allowance for credit losses - Credit Quality of Loan Portfolio by Year of Origination (Details) - USD ($)
$ in Thousands |
Dec. 31, 2020 |
Jan. 01, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
$ 1,517,481
|
|
|
|
| 2019 |
1,246,239
|
|
|
|
| 2018 |
853,371
|
|
|
|
| 2017 |
696,494
|
|
|
|
| 2016 |
648,821
|
|
|
|
| Prior |
900,082
|
|
|
|
| Revolving Loans Amortized Cost Basis |
1,220,471
|
|
|
|
| Loans |
7,082,959
|
$ 4,409,642
|
$ 4,409,642
|
$ 3,667,511
|
| Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
1,497,137
|
|
|
|
| 2019 |
1,211,412
|
|
|
|
| 2018 |
773,545
|
|
|
|
| 2017 |
600,634
|
|
|
|
| 2016 |
589,607
|
|
|
|
| Prior |
764,683
|
|
|
|
| Revolving Loans Amortized Cost Basis |
1,149,198
|
|
|
|
| Loans |
6,586,216
|
|
4,143,116
|
|
| Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
16,627
|
|
|
|
| 2019 |
24,396
|
|
|
|
| 2018 |
56,256
|
|
|
|
| 2017 |
78,586
|
|
|
|
| 2016 |
47,801
|
|
|
|
| Prior |
90,980
|
|
|
|
| Revolving Loans Amortized Cost Basis |
49,874
|
|
|
|
| Loans |
364,520
|
|
186,180
|
|
| Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
3,628
|
|
|
|
| 2019 |
9,991
|
|
|
|
| 2018 |
22,984
|
|
|
|
| 2017 |
16,960
|
|
|
|
| 2016 |
11,053
|
|
|
|
| Prior |
43,798
|
|
|
|
| Revolving Loans Amortized Cost Basis |
20,659
|
|
|
|
| Loans |
129,073
|
|
80,346
|
|
| Doubtful |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
89
|
|
|
|
| 2019 |
440
|
|
|
|
| 2018 |
586
|
|
|
|
| 2017 |
314
|
|
|
|
| 2016 |
360
|
|
|
|
| Prior |
621
|
|
|
|
| Revolving Loans Amortized Cost Basis |
740
|
|
|
|
| Loans |
3,150
|
|
|
|
| Commercial and industrial |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
341,806
|
|
|
|
| 2019 |
189,148
|
|
|
|
| 2018 |
82,337
|
|
|
|
| 2017 |
64,787
|
|
|
|
| 2016 |
45,070
|
|
|
|
| Prior |
46,542
|
|
|
|
| Revolving Loans Amortized Cost Basis |
576,432
|
|
|
|
| Loans |
1,346,122
|
|
1,034,036
|
867,083
|
| Commercial and industrial | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
335,519
|
|
|
|
| 2019 |
183,905
|
|
|
|
| 2018 |
64,897
|
|
|
|
| 2017 |
56,598
|
|
|
|
| 2016 |
30,641
|
|
|
|
| Prior |
40,964
|
|
|
|
| Revolving Loans Amortized Cost Basis |
525,885
|
|
|
|
| Loans |
1,238,409
|
|
|
|
| Commercial and industrial | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
3,786
|
|
|
|
| 2019 |
2,555
|
|
|
|
| 2018 |
6,213
|
|
|
|
| 2017 |
3,764
|
|
|
|
| 2016 |
7,847
|
|
|
|
| Prior |
4,301
|
|
|
|
| Revolving Loans Amortized Cost Basis |
39,901
|
|
|
|
| Loans |
68,367
|
|
|
|
| Commercial and industrial | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
2,467
|
|
|
|
| 2019 |
2,688
|
|
|
|
| 2018 |
11,227
|
|
|
|
| 2017 |
4,403
|
|
|
|
| 2016 |
6,582
|
|
|
|
| Prior |
1,277
|
|
|
|
| Revolving Loans Amortized Cost Basis |
10,502
|
|
|
|
| Loans |
39,146
|
|
|
|
| Commercial and industrial | Doubtful |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
34
|
|
|
|
| 2019 |
0
|
|
|
|
| 2018 |
0
|
|
|
|
| 2017 |
22
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
0
|
|
|
|
| Revolving Loans Amortized Cost Basis |
144
|
|
|
|
| Loans |
200
|
|
|
|
| Construction |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
462,757
|
|
|
|
| 2019 |
393,683
|
|
|
|
| 2018 |
91,865
|
|
|
|
| 2017 |
54,304
|
|
|
|
| 2016 |
41,636
|
|
|
|
| Prior |
65,971
|
|
|
|
| Revolving Loans Amortized Cost Basis |
112,004
|
|
|
|
| Loans |
1,222,220
|
|
551,101
|
556,051
|
| Construction | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
460,232
|
|
|
|
| 2019 |
387,759
|
|
|
|
| 2018 |
78,319
|
|
|
|
| 2017 |
40,777
|
|
|
|
| 2016 |
40,386
|
|
|
|
| Prior |
59,344
|
|
|
|
| Revolving Loans Amortized Cost Basis |
112,004
|
|
|
|
| Loans |
1,178,821
|
|
|
|
| Construction | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
1,952
|
|
|
|
| 2019 |
4,169
|
|
|
|
| 2018 |
10,368
|
|
|
|
| 2017 |
13,386
|
|
|
|
| 2016 |
1,250
|
|
|
|
| Prior |
3,559
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
34,684
|
|
|
|
| Construction | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
573
|
|
|
|
| 2019 |
1,755
|
|
|
|
| 2018 |
3,178
|
|
|
|
| 2017 |
129
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
3,068
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
8,703
|
|
|
|
| Construction | Doubtful |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
0
|
|
|
|
| 2018 |
0
|
|
|
|
| 2017 |
12
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
0
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
12
|
|
|
|
| Residential real estate | 1-to-4 family mortgage |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
284,978
|
|
|
|
| 2019 |
179,968
|
|
|
|
| 2018 |
169,514
|
|
|
|
| 2017 |
163,957
|
|
|
|
| 2016 |
115,537
|
|
|
|
| Prior |
175,316
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
1,089,270
|
|
710,454
|
555,815
|
| Residential real estate | 1-to-4 family mortgage | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
282,747
|
|
|
|
| 2019 |
176,374
|
|
|
|
| 2018 |
159,036
|
|
|
|
| 2017 |
147,816
|
|
|
|
| 2016 |
107,911
|
|
|
|
| Prior |
152,027
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
1,025,911
|
|
|
|
| Residential real estate | 1-to-4 family mortgage | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
1,783
|
|
|
|
| 2019 |
2,166
|
|
|
|
| 2018 |
6,672
|
|
|
|
| 2017 |
10,668
|
|
|
|
| 2016 |
4,004
|
|
|
|
| Prior |
13,889
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
39,182
|
|
|
|
| Residential real estate | 1-to-4 family mortgage | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
448
|
|
|
|
| 2019 |
1,422
|
|
|
|
| 2018 |
3,787
|
|
|
|
| 2017 |
5,473
|
|
|
|
| 2016 |
3,418
|
|
|
|
| Prior |
9,043
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
23,591
|
|
|
|
| Residential real estate | 1-to-4 family mortgage | Doubtful |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
6
|
|
|
|
| 2018 |
19
|
|
|
|
| 2017 |
0
|
|
|
|
| 2016 |
204
|
|
|
|
| Prior |
357
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
586
|
|
|
|
| Residential real estate | Residential line of credit |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
0
|
|
|
|
| 2018 |
0
|
|
|
|
| 2017 |
0
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
0
|
|
|
|
| Revolving Loans Amortized Cost Basis |
408,211
|
|
|
|
| Loans |
408,211
|
|
221,530
|
190,480
|
| Residential real estate | Residential line of credit | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
0
|
|
|
|
| 2018 |
0
|
|
|
|
| 2017 |
0
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
0
|
|
|
|
| Revolving Loans Amortized Cost Basis |
396,348
|
|
|
|
| Loans |
396,348
|
|
|
|
| Residential real estate | Residential line of credit | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
0
|
|
|
|
| 2018 |
0
|
|
|
|
| 2017 |
0
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
0
|
|
|
|
| Revolving Loans Amortized Cost Basis |
6,511
|
|
|
|
| Loans |
6,511
|
|
|
|
| Residential real estate | Residential line of credit | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
0
|
|
|
|
| 2018 |
0
|
|
|
|
| 2017 |
0
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
0
|
|
|
|
| Revolving Loans Amortized Cost Basis |
4,756
|
|
|
|
| Loans |
4,756
|
|
|
|
| Residential real estate | Residential line of credit | Doubtful |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
0
|
|
|
|
| 2018 |
0
|
|
|
|
| 2017 |
0
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
0
|
|
|
|
| Revolving Loans Amortized Cost Basis |
596
|
|
|
|
| Loans |
596
|
|
|
|
| Residential real estate | Multi-family mortgage |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
29,006
|
|
|
|
| 2019 |
13,446
|
|
|
|
| 2018 |
11,843
|
|
|
|
| 2017 |
46,561
|
|
|
|
| 2016 |
28,330
|
|
|
|
| Prior |
35,396
|
|
|
|
| Revolving Loans Amortized Cost Basis |
11,094
|
|
|
|
| Loans |
175,676
|
|
69,429
|
75,457
|
| Residential real estate | Multi-family mortgage | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
29,006
|
|
|
|
| 2019 |
13,446
|
|
|
|
| 2018 |
11,843
|
|
|
|
| 2017 |
46,561
|
|
|
|
| 2016 |
28,330
|
|
|
|
| Prior |
35,339
|
|
|
|
| Revolving Loans Amortized Cost Basis |
11,094
|
|
|
|
| Loans |
175,619
|
|
|
|
| Residential real estate | Multi-family mortgage | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
0
|
|
|
|
| 2018 |
0
|
|
|
|
| 2017 |
0
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
0
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
0
|
|
|
|
| Residential real estate | Multi-family mortgage | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
0
|
|
|
|
| 2018 |
0
|
|
|
|
| 2017 |
0
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
57
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
57
|
|
|
|
| Residential real estate | Multi-family mortgage | Doubtful |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
0
|
|
|
|
| 2018 |
0
|
|
|
|
| 2017 |
0
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
0
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
0
|
|
|
|
| Residential real estate | Non-owner occupied |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
166,962
|
|
|
|
| 2019 |
233,152
|
|
|
|
| 2018 |
350,814
|
|
|
|
| 2017 |
221,149
|
|
|
|
| 2016 |
290,370
|
|
|
|
| Prior |
297,712
|
|
|
|
| Revolving Loans Amortized Cost Basis |
38,820
|
|
|
|
| Loans |
1,598,979
|
|
|
|
| Residential real estate | Non-owner occupied | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
166,962
|
|
|
|
| 2019 |
222,238
|
|
|
|
| 2018 |
324,848
|
|
|
|
| 2017 |
193,496
|
|
|
|
| 2016 |
264,820
|
|
|
|
| Prior |
237,933
|
|
|
|
| Revolving Loans Amortized Cost Basis |
37,787
|
|
|
|
| Loans |
1,448,084
|
|
|
|
| Residential real estate | Non-owner occupied | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
8,704
|
|
|
|
| 2018 |
24,464
|
|
|
|
| 2017 |
27,653
|
|
|
|
| 2016 |
25,550
|
|
|
|
| Prior |
42,696
|
|
|
|
| Revolving Loans Amortized Cost Basis |
1,033
|
|
|
|
| Loans |
130,100
|
|
|
|
| Residential real estate | Non-owner occupied | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
2,210
|
|
|
|
| 2018 |
1,502
|
|
|
|
| 2017 |
0
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
17,083
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
20,795
|
|
|
|
| Residential real estate | Non-owner occupied | Doubtful |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
0
|
|
|
|
| 2018 |
0
|
|
|
|
| 2017 |
0
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
0
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
0
|
|
|
|
| Commercial real estate |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
141,915
|
|
|
|
| 2019 |
182,641
|
|
|
|
| 2018 |
104,251
|
|
|
|
| 2017 |
116,906
|
|
|
|
| 2016 |
82,914
|
|
|
|
| Prior |
237,800
|
|
|
|
| Revolving Loans Amortized Cost Basis |
58,414
|
|
|
|
| Loans |
924,841
|
|
|
|
| Commercial real estate | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
133,046
|
|
|
|
| 2019 |
174,965
|
|
|
|
| 2018 |
95,182
|
|
|
|
| 2017 |
89,214
|
|
|
|
| 2016 |
76,539
|
|
|
|
| Prior |
208,013
|
|
|
|
| Revolving Loans Amortized Cost Basis |
51,264
|
|
|
|
| Loans |
828,223
|
|
|
|
| Commercial real estate | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
8,825
|
|
|
|
| 2019 |
5,891
|
|
|
|
| 2018 |
6,646
|
|
|
|
| 2017 |
21,618
|
|
|
|
| 2016 |
6,101
|
|
|
|
| Prior |
18,561
|
|
|
|
| Revolving Loans Amortized Cost Basis |
2,417
|
|
|
|
| Loans |
70,059
|
|
|
|
| Commercial real estate | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
44
|
|
|
|
| 2019 |
1,785
|
|
|
|
| 2018 |
2,423
|
|
|
|
| 2017 |
6,074
|
|
|
|
| 2016 |
274
|
|
|
|
| Prior |
11,226
|
|
|
|
| Revolving Loans Amortized Cost Basis |
4,733
|
|
|
|
| Loans |
26,559
|
|
|
|
| Commercial real estate | Doubtful |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
0
|
|
|
|
| 2019 |
0
|
|
|
|
| 2018 |
0
|
|
|
|
| 2017 |
0
|
|
|
|
| 2016 |
0
|
|
|
|
| Prior |
0
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
0
|
|
|
|
| Commercial real estate | Non-owner occupied |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| Loans |
1,598,979
|
|
920,744
|
700,248
|
| Consumer and other |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
90,057
|
|
|
|
| 2019 |
54,201
|
|
|
|
| 2018 |
42,747
|
|
|
|
| 2017 |
28,830
|
|
|
|
| 2016 |
44,964
|
|
|
|
| Prior |
41,345
|
|
|
|
| Revolving Loans Amortized Cost Basis |
15,496
|
|
|
|
| Loans |
317,640
|
|
$ 272,078
|
$ 228,853
|
| Consumer and other | Pass |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
89,625
|
|
|
|
| 2019 |
52,725
|
|
|
|
| 2018 |
39,420
|
|
|
|
| 2017 |
26,172
|
|
|
|
| 2016 |
40,980
|
|
|
|
| Prior |
31,063
|
|
|
|
| Revolving Loans Amortized Cost Basis |
14,816
|
|
|
|
| Loans |
294,801
|
|
|
|
| Consumer and other | Watch |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
281
|
|
|
|
| 2019 |
911
|
|
|
|
| 2018 |
1,893
|
|
|
|
| 2017 |
1,497
|
|
|
|
| 2016 |
3,049
|
|
|
|
| Prior |
7,974
|
|
|
|
| Revolving Loans Amortized Cost Basis |
12
|
|
|
|
| Loans |
15,617
|
|
|
|
| Consumer and other | Substandard |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
96
|
|
|
|
| 2019 |
131
|
|
|
|
| 2018 |
867
|
|
|
|
| 2017 |
881
|
|
|
|
| 2016 |
779
|
|
|
|
| Prior |
2,044
|
|
|
|
| Revolving Loans Amortized Cost Basis |
668
|
|
|
|
| Loans |
5,466
|
|
|
|
| Consumer and other | Doubtful |
|
|
|
|
| Financing Receivable, Allowance for Credit Loss [Line Items] |
|
|
|
|
| 2020 |
55
|
|
|
|
| 2019 |
434
|
|
|
|
| 2018 |
567
|
|
|
|
| 2017 |
280
|
|
|
|
| 2016 |
156
|
|
|
|
| Prior |
264
|
|
|
|
| Revolving Loans Amortized Cost Basis |
0
|
|
|
|
| Loans |
$ 1,756
|
|
|
|