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Actual regulatory capital position and minimum capital requirements (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Total Capital To Risk Weighted Assets [Member]    
Banking Regulation, Total Capital, Actual $ 171,829 $ 168,786
Banking Regulation, Total Risk-Based Capital Ratio, Actual 0.1341 0.1343
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum $ 102,472 $ 100,525
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.080 0.080
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferAmount-0] $ 134,495 $ 131,939
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferRatio-0] 10.50% 10.50%
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum $ 128,090 $ 125,656
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.100 0.100
Tier 1 Capital To Risk Weighted Assets [Member]    
Banking Regulation, Total Capital, Actual $ 155,812 $ 153,762
Banking Regulation, Total Risk-Based Capital Ratio, Actual 0.1216 0.1224
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum $ 76,854 $ 75,394
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.060 0.060
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferAmount-0] $ 108,877 $ 106,808
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferRatio-0] 8.50% 8.50%
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum $ 102,472 $ 100,525
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.080 0.080
Common Equity Tier 1 Capital To Risk Weighted Assets [Member]    
Banking Regulation, Total Capital, Actual $ 155,812 $ 153,762
Banking Regulation, Total Risk-Based Capital Ratio, Actual 0.1216 0.1224
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum $ 57,641 $ 56,545
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.045 0.045
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferAmount-0] $ 89,663 $ 87,959
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferRatio-0] 7.00% 7.00%
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum $ 83,259 $ 81,677
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.065 0.065
Tier 1 Capital To Average Assets [Member]    
Banking Regulation, Total Capital, Actual $ 155,812 $ 153,762
Banking Regulation, Total Risk-Based Capital Ratio, Actual 0.0998 0.0999
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum $ 62,444 $ 61,540
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.040 0.040
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferAmount-0] $ 62,444 $ 61,540
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferRatio-0] 4.00% 4.00%
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum $ 78,055 $ 76,925
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.050 0.050