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Actual regulatory capital position and minimum capital requirements (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Total Capital (to risk-weighted assets)    
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Banking Regulation, Total Capital, Actual $ 127,254 $ 114,421
Banking Regulation, Total Risk-Based Capital Ratio, Actual 0.1357 0.1284
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum $ 75,037 $ 71,278
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.080 0.080
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferAmount-0] $ 98,486 $ 93,553
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferRatio-0] 0.105 0.105
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum $ 93,796 $ 89,098
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.100 0.100
Tier 1 Capital (to risk-weighted assets)    
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Banking Regulation, Total Capital, Actual $ 115,503 $ 105,430
Banking Regulation, Total Risk-Based Capital Ratio, Actual 0.1231 0.1183
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum $ 56,278 $ 53,459
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.060 0.060
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferAmount-0] $ 79,727 $ 75,733
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferRatio-0] 0.085 0.085
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum $ 75,037 $ 71,278
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.080 0.080
Common Equity Tier 1 Capital (to risk-weighted assets)    
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Banking Regulation, Total Capital, Actual $ 115,503 $ 105,430
Banking Regulation, Total Risk-Based Capital Ratio, Actual 0.1231 0.1183
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum $ 42,208 $ 40,094
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.045 0.045
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferAmount-0] $ 65,657 $ 62,368
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferRatio-0] 0.070 0.070
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum $ 60,967 $ 57,914
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.065 0.065
Tier 1 Capital (to average assets)    
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Banking Regulation, Total Capital, Actual $ 115,503 $ 105,430
Banking Regulation, Total Risk-Based Capital Ratio, Actual 0.0890 0.0960
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum $ 51,907 $ 43,944
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.040 0.040
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferAmount-0] $ 51,907 $ 43,944
[custom:TotalCapitalMinimumCapitalRequiredForCapitalAdequacyPlusRequiredCapitalConservationBufferRatio-0] 0.040 0.040
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum $ 64,884 $ 54,930
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.050 0.050