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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