Loans and allowance for credit losses - Amortized Cost, Related Allowance and Interest Income of Non-accrual Loans (Details) - USD ($)
$ in Thousands |
12 Months Ended |
|
Dec. 31, 2020 |
Dec. 31, 2019 |
| Financing Receivable, Past Due [Line Items] |
|
|
| Beginning of period non-accrual amortized cost |
|
$ 25,282
|
| Non-accrual with no related allowance |
$ 32,661
|
|
| Non-accrual with related allowance |
18,099
|
|
| Related allowance |
2,550
|
|
| Year to date Interest Income |
816
|
|
| Commercial and industrial |
|
|
| Financing Receivable, Past Due [Line Items] |
|
|
| Beginning of period non-accrual amortized cost |
|
5,586
|
| Non-accrual with no related allowance |
13,960
|
|
| Non-accrual with related allowance |
2,045
|
|
| Related allowance |
383
|
|
| Year to date Interest Income |
325
|
|
| Construction |
|
|
| Financing Receivable, Past Due [Line Items] |
|
|
| Beginning of period non-accrual amortized cost |
|
1,254
|
| Non-accrual with no related allowance |
3,061
|
|
| Non-accrual with related allowance |
992
|
|
| Related allowance |
131
|
|
| Year to date Interest Income |
69
|
|
| Residential real estate | 1-to-4 family mortgage |
|
|
| Financing Receivable, Past Due [Line Items] |
|
|
| Beginning of period non-accrual amortized cost |
|
4,585
|
| Non-accrual with no related allowance |
3,048
|
|
| Non-accrual with related allowance |
2,875
|
|
| Related allowance |
84
|
|
| Year to date Interest Income |
22
|
|
| Residential real estate | Residential line of credit |
|
|
| Financing Receivable, Past Due [Line Items] |
|
|
| Beginning of period non-accrual amortized cost |
|
489
|
| Non-accrual with no related allowance |
854
|
|
| Non-accrual with related allowance |
903
|
|
| Related allowance |
31
|
|
| Year to date Interest Income |
72
|
|
| Commercial real estate | Owner occupied |
|
|
| Financing Receivable, Past Due [Line Items] |
|
|
| Beginning of period non-accrual amortized cost |
|
2,285
|
| Non-accrual with no related allowance |
7,172
|
|
| Non-accrual with related allowance |
776
|
|
| Related allowance |
63
|
|
| Year to date Interest Income |
89
|
|
| Commercial real estate | Non-owner occupied |
|
|
| Financing Receivable, Past Due [Line Items] |
|
|
| Beginning of period non-accrual amortized cost |
|
9,460
|
| Non-accrual with no related allowance |
4,566
|
|
| Non-accrual with related allowance |
7,905
|
|
| Related allowance |
1,711
|
|
| Year to date Interest Income |
215
|
|
| Consumer and other |
|
|
| Financing Receivable, Past Due [Line Items] |
|
|
| Beginning of period non-accrual amortized cost |
|
$ 1,623
|
| Non-accrual with no related allowance |
0
|
|
| Non-accrual with related allowance |
2,603
|
|
| Related allowance |
147
|
|
| Year to date Interest Income |
$ 24
|
|