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Minimum Regulatory Capital Requirements - Summary of Bank's Actual and Required Capital Amounts and Ratios (Detail)
$ in Thousands
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 01, 2019
Federal Home Loan Banks [Abstract]      
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Amount $ 256,943 $ 164,322  
Total Risk-Based Capital to Risk Weighted Assets Actual, Amount 274,226 178,635  
Tier 1 Capital to Risk Weighted Assets Actual, Amount 256,943 164,322  
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount $ 256,943 $ 164,322  
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio 14.26% 11.63%  
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio 15.22 12.64  
Tier 1 Capital to Risk Weighted Assets Actual, Ratio 14.26 11.63  
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio 10.25 9.08 4.0
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount $ 81,074 $ 63,542  
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount 144,138 113,032  
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount 108,104 84,774  
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount $ 100,317 $ 72,419  
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 8.00 8.00 8.0
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio 6.00 6.00  
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Ratio 4.00 4.00  
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount $ 117,112 $ 91,783  
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount 180,173 141,290  
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount 144,138 113,032  
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount $ 125,396 $ 90,524  
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 10.00 10.00  
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio 8.00 8.00  
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio 5.00 5.00