Loans and allowance for loan losses - Nonaccrual TDRs and the related specific valuation allowance by portfolio segment (Details)
$ in Thousands |
3 Months Ended |
12 Months Ended |
|
Mar. 31, 2021
USD ($)
loan
|
Dec. 31, 2020
USD ($)
loan
|
| Specific Valuation Allowance [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
$ 8
|
$ 17
|
| Number of Loans | loan |
2
|
2
|
| Portfolio Segment [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
$ 7,610
|
$ 7,491
|
| Number of Loans | loan |
35
|
34
|
| Performing Financing Receivable [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
$ 6,678
|
$ 6,550
|
| Number of Loans | loan |
28
|
27
|
| Nonperforming Financial Instruments [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
$ 932
|
$ 941
|
| Number of Loans | loan |
7
|
7
|
| Commercial real estate | Specific Valuation Allowance [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
|
$ 9
|
| Commercial real estate | Portfolio Segment [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
$ 5,262
|
5,387
|
| Commercial real estate | Performing Financing Receivable [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
4,962
|
5,084
|
| Commercial real estate | Nonperforming Financial Instruments [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
$ 300
|
303
|
| Consumer real estate |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Number of Loans | loan |
1
|
|
| Consumer real estate | Specific Valuation Allowance [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
$ 8
|
8
|
| Consumer real estate | Portfolio Segment [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
2,323
|
2,077
|
| Consumer real estate | Performing Financing Receivable [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
1,716
|
1,466
|
| Consumer real estate | Nonperforming Financial Instruments [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
607
|
611
|
| Owner Occupied [Member] | Commercial real estate | Specific Valuation Allowance [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
|
9
|
| Owner Occupied [Member] | Commercial real estate | Portfolio Segment [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
3,367
|
3,396
|
| Owner Occupied [Member] | Commercial real estate | Performing Financing Receivable [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
3,367
|
3,396
|
| Non-Owner Occupied [Member] | Commercial real estate | Portfolio Segment [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
1,895
|
1,991
|
| Non-Owner Occupied [Member] | Commercial real estate | Performing Financing Receivable [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
1,595
|
1,688
|
| Non-Owner Occupied [Member] | Commercial real estate | Nonperforming Financial Instruments [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
$ 300
|
303
|
| First Deed of Trust [Member] | Consumer real estate |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Number of Loans | loan |
1
|
|
| First Deed of Trust [Member] | Consumer real estate | Specific Valuation Allowance [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
$ 8
|
8
|
| First Deed of Trust [Member] | Consumer real estate | Portfolio Segment [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
1,717
|
1,460
|
| First Deed of Trust [Member] | Consumer real estate | Performing Financing Receivable [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
1,171
|
910
|
| First Deed of Trust [Member] | Consumer real estate | Nonperforming Financial Instruments [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
546
|
550
|
| Second Deed of Trust [Member] | Consumer real estate | Portfolio Segment [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
606
|
617
|
| Second Deed of Trust [Member] | Consumer real estate | Performing Financing Receivable [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
545
|
556
|
| Second Deed of Trust [Member] | Consumer real estate | Nonperforming Financial Instruments [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
61
|
61
|
| Commercial and industrial loans (except those secured by real estate) | Commercial and industrial loans | Portfolio Segment [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
25
|
27
|
| Commercial and industrial loans (except those secured by real estate) | Commercial and industrial loans | Nonperforming Financial Instruments [Member] |
|
|
| Information concerning Troubled Debt Restructurings |
|
|
| Recorded Investment |
$ 25
|
$ 27
|