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Allowance for Credit Losses - Loans - Commercial and commercial real estate loan portfolios (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total loans | $ 1,025,687 |  | $ 1,038,271
Current period gross charge-offs, Total | 164 | $ 139 |
Other commercial and industrial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total loans | 148,805 |  | 159,424
Current period gross charge-offs, Total | 103 |  |
Other commercial real estate (non-owner occupied) |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total loans | 229,574 |  | 240,286
Residential mortgage |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total loans | 176,991 |  | 174,670
Commercial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2024/2023 | 20,799 |  | 128,219
2023/2022 | 129,940 |  | 120,075
2022/2021 | 117,506 |  | 126,424
2021/2020 | 125,474 |  | 70,567
2020/2019 | 69,281 |  | 66,896
PRIOR | 226,128 |  | 182,673
Revolving Loans Amortized to Basis | 56,624 |  | 65,703
Revolving Loans Converted to Term |  |  | 269
Total loans | 745,752 |  | 760,826
Current period gross charge-offs, 2023/2022 |  |  | 75
Current period gross charge-offs, 2022/2021 | 103 |  |
Current period gross charge-offs, 2020/2019 |  |  | 804
Current period gross charge-offs, Prior |  |  | 2,433
Current period gross charge-offs, Total | 103 |  | 3,312
Commercial | Commercial real estate (owner occupied) |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2024/2023 | 2,074 |  | 17,801
2023/2022 | 17,706 |  | 6,750
2022/2021 | 6,481 |  | 15,531
2021/2020 | 15,375 |  | 8,415
2020/2019 | 11,157 |  | 12,574
PRIOR | 33,748 |  | 26,802
Revolving Loans Amortized to Basis | 1,489 |  | 1,274
Total loans | 88,030 |  | 89,147
Commercial | Other commercial and industrial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2024/2023 | 4,955 |  | 22,662
2023/2022 | 21,643 |  | 35,435
2022/2021 | 33,005 |  | 12,894
2021/2020 | 12,016 |  | 5,831
2020/2019 | 5,480 |  | 4,912
PRIOR | 24,556 |  | 21,165
Revolving Loans Amortized to Basis | 47,150 |  | 56,455
Revolving Loans Converted to Term |  |  | 70
Total loans | 148,805 |  | 159,424
Current period gross charge-offs, 2023/2022 |  |  | 75
Current period gross charge-offs, 2022/2021 | 103 |  |
Current period gross charge-offs, Prior |  |  | 405
Current period gross charge-offs, Total | 103 |  | 480
Commercial | Commercial real estate (non-owner occupied) |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total loans |  |  | 161,961
Commercial | Commercial real estate (non-owner occupied) - retail |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2024/2023 | 8,000 |  | 35,545
2023/2022 | 36,073 |  | 23,682
2022/2021 | 23,455 |  | 33,110
2021/2020 | 32,820 |  | 23,146
2020/2019 | 22,935 |  | 9,226
PRIOR | 45,521 |  | 36,269
Revolving Loans Amortized to Basis | 983 |  | 983
Total loans | 169,787 |  | 161,961
Current period gross charge-offs, Prior |  |  | 2,028
Current period gross charge-offs, Total |  |  | 2,028
Commercial | Commercial real estate (non-owner occupied) - multi-family |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2024/2023 | 5,297 |  | 22,620
2023/2022 | 23,843 |  | 16,767
2022/2021 | 16,682 |  | 16,622
2021/2020 | 17,062 |  | 13,007
2020/2019 | 12,874 |  | 10,916
PRIOR | 33,232 |  | 28,755
Revolving Loans Amortized to Basis | 566 |  | 1,321
Total loans | 109,556 |  | 110,008
Commercial | Other commercial real estate (non-owner occupied) |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2024/2023 | 473 |  | 29,591
2023/2022 | 30,675 |  | 37,441
2022/2021 | 37,883 |  | 48,267
2021/2020 | 48,201 |  | 20,168
2020/2019 | 16,835 |  | 29,268
PRIOR | 89,071 |  | 69,682
Revolving Loans Amortized to Basis | 6,436 |  | 5,670
Revolving Loans Converted to Term |  |  | 199
Total loans | 229,574 |  | 240,286
Current period gross charge-offs, 2020/2019 |  |  | 804
Current period gross charge-offs, Total |  |  | 804
Pass | Commercial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2024/2023 | 20,799 |  | 128,219
2023/2022 | 129,940 |  | 118,099
2022/2021 | 115,760 |  | 125,833
2021/2020 | 125,275 |  | 69,601
2020/2019 | 68,327 |  | 57,123
PRIOR | 200,933 |  | 164,651
Revolving Loans Amortized to Basis | 56,550 |  | 64,716
Revolving Loans Converted to Term |  |  | 70
Total loans | 717,584 |  | 728,312
Pass | Commercial | Commercial real estate (owner occupied) |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2024/2023 | 2,074 |  | 17,801
2023/2022 | 17,706 |  | 6,750
2022/2021 | 6,481 |  | 15,067
2021/2020 | 15,375 |  | 8,415
2020/2019 | 11,157 |  | 10,322
PRIOR | 33,491 |  | 26,538
Revolving Loans Amortized to Basis | 1,489 |  | 351
Total loans | 87,773 |  | 85,244
Pass | Commercial | Other commercial and industrial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2024/2023 | 4,955 |  | 22,662
2023/2022 | 21,643 |  | 34,816
2022/2021 | 32,438 |  | 12,767
2021/2020 | 12,016 |  | 5,831
2020/2019 | 5,480 |  | 4,912
PRIOR | 23,002 |  | 19,587
Revolving Loans Amortized to Basis | 47,076 |  | 56,391
Revolving Loans Converted to Term |  |  | 70
Total loans | 146,610 |  | 157,036
Pass | Commercial | Commercial real estate (non-owner occupied) - retail |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2024/2023 | 8,000 |  | 35,545
2023/2022 | 36,073 |  | 23,368
2022/2021 | 23,143 |  | 33,110
2021/2020 | 32,820 |  | 23,146
2020/2019 | 22,935 |  | 9,226
PRIOR | 44,397 |  | 35,102
Revolving Loans Amortized to Basis | 983 |  | 983
Total loans | 168,351 |  | 160,480
Pass | Commercial | Commercial real estate (non-owner occupied) - multi-family |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2024/2023 | 5,297 |  | 22,620
2023/2022 | 23,843 |  | 16,767
2022/2021 | 16,682 |  | 16,622
2021/2020 | 17,062 |  | 12,041
2020/2019 | 11,920 |  | 9,638
PRIOR | 31,840 |  | 28,632
Revolving Loans Amortized to Basis | 566 |  | 1,321
Total loans | 107,210 |  | 107,641
Pass | Commercial | Other commercial real estate (non-owner occupied) |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2024/2023 | 473 |  | 29,591
2023/2022 | 30,675 |  | 36,398
2022/2021 | 37,016 |  | 48,267
2021/2020 | 48,002 |  | 20,168
2020/2019 | 16,835 |  | 23,025
PRIOR | 68,203 |  | 54,792
Revolving Loans Amortized to Basis | 6,436 |  | 5,670
Total loans | 207,640 |  | 217,911
Special Mention | Commercial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023/2022 |  |  | 314
2022/2021 | 312 |  | 591
2020/2019 |  |  | 2,252
PRIOR | 4,829 |  | 4,944
Revolving Loans Amortized to Basis |  |  | 923
Total loans | 5,141 |  | 9,024
Special Mention | Commercial | Commercial real estate (owner occupied) |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2022/2021 |  |  | 464
2020/2019 |  |  | 2,252
Revolving Loans Amortized to Basis |  |  | 923
Total loans |  |  | 3,639
Special Mention | Commercial | Other commercial and industrial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2022/2021 |  |  | 127
Total loans |  |  | 127
Special Mention | Commercial | Commercial real estate (non-owner occupied) - retail |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023/2022 |  |  | 314
2022/2021 | 312 |  |
PRIOR | 1,124 |  | 1,167
Total loans | 1,436 |  | 1,481
Special Mention | Commercial | Other commercial real estate (non-owner occupied) |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
PRIOR | 3,705 |  | 3,777
Total loans | 3,705 |  | 3,777
Substandard | Commercial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023/2022 |  |  | 1,662
2022/2021 | 1,434 |  |
2021/2020 | 199 |  | 966
2020/2019 | 954 |  | 7,521
PRIOR | 20,366 |  | 13,078
Revolving Loans Amortized to Basis | 74 |  | 64
Revolving Loans Converted to Term |  |  | 199
Total loans | 23,027 |  | 23,490
Substandard | Commercial | Commercial real estate (owner occupied) |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
PRIOR | 257 |  | 264
Total loans | 257 |  | 264
Substandard | Commercial | Other commercial and industrial |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023/2022 |  |  | 619
2022/2021 | 567 |  |
PRIOR | 1,554 |  | 1,578
Revolving Loans Amortized to Basis | 74 |  | 64
Total loans | 2,195 |  | 2,261
Substandard | Commercial | Commercial real estate (non-owner occupied) - multi-family |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021/2020 |  |  | 966
2020/2019 | 954 |  | 1,278
PRIOR | 1,392 |  | 123
Total loans | 2,346 |  | 2,367
Substandard | Commercial | Other commercial real estate (non-owner occupied) |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023/2022 |  |  | 1,043
2022/2021 | 867 |  |
2021/2020 | 199 |  |
2020/2019 |  |  | 6,243
PRIOR | 17,163 |  | 11,113
Revolving Loans Converted to Term |  |  | 199
Total loans | $ 18,229 |  | $ 18,598

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