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Actual regulatory capital position and minimum capital requirements (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Total Capital To Risk Weighted Assets [Member]    
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Banking Regulation, Total Capital, Actual $ 149,213 $ 127,254
Banking Regulation, Total Risk-Based Capital Ratio, Actual 0.1420 0.1357
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum $ 84,080 $ 75,037
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.080 0.080
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferAmount-0] $ 110,355 $ 98,486
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferRatio-0] 10.50% 10.50%
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum $ 105,100 $ 93,796
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.100 0.100
Tier 1 Capital To Risk Weighted Assets [Member]    
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Banking Regulation, Total Capital, Actual $ 136,074 $ 115,503
Banking Regulation, Total Risk-Based Capital Ratio, Actual 0.1295 0.1231
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum $ 63,060 $ 56,278
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.060 0.060
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferAmount-0] $ 89,335 $ 79,727
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferRatio-0] 8.50% 8.50%
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum $ 84,080 $ 75,037
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.080 0.080
Common Equity Tier 1 Capital To Risk Weighted Assets [Member]    
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Banking Regulation, Total Capital, Actual $ 136,074 $ 115,503
Banking Regulation, Total Risk-Based Capital Ratio, Actual 0.1295 0.1231
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum $ 47,295 $ 42,208
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.045 0.045
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferAmount-0] $ 73,570 $ 66,657
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferRatio-0] 7.00% 7.00%
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum $ 68,315 $ 60,967
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.065 0.065
Tier 1 Capital To Average Assets [Member]    
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Banking Regulation, Total Capital, Actual $ 136,074 $ 115,503
Banking Regulation, Total Risk-Based Capital Ratio, Actual 0.0931 0.0890
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum $ 58,451 $ 51,907
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.040 0.040
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferAmount-0] $ 58,451 $ 51,907
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferRatio-0] 4.00% 4.00%
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum $ 73,063 $ 64,884
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.050 0.050