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Minimum Regulatory Capital Requirements - Summary of Bank's Actual and Required Capital Amounts and Ratios (Detail)
$ in Thousands
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jan. 01, 2019
Federal Home Loan Banks [Abstract]      
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Amount $ 259,510 $ 256,943  
Total Risk-Based Capital to Risk Weighted Assets Actual, Amount 281,085 274,226  
Tier 1 Capital to Risk Weighted Assets Actual, Amount 259,510 256,943  
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount $ 259,510 $ 256,943  
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio 11.15% 14.26%  
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio 0.1207 0.1522  
Tier 1 Capital to Risk Weighted Assets Actual, Ratio 0.1115 0.1426  
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio 0.0903 0.1025 0.040
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount $ 104,763 $ 81,074  
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount 186,245 144,138  
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount 139,684 108,104  
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount $ 114,972 $ 100,317  
Common Equity Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio 4.50% 4.50%  
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio 0.0800 0.0800 0.080
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio 0.0600 0.0600  
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Ratio 0.0400 0.0400  
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount $ 151,324 $ 117,112  
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount 232,806 180,173  
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount 186,245 144,138  
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount $ 143,714 $ 125,396  
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio 6.50% 6.50%  
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio 0.1000 0.1000  
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio 0.0800 0.0800  
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio 0.0500 0.0500