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LOANS - Summary of impaired loans (Detail) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Financing Receivable, Past Due [Line Items]      
Loans with no related allowance recorded $ 1,751,664   $ 1,992,979
Loans with an allowance recorded 173,925   174,776
Amount of allowance for loan losses allocated 35,859   35,859
Average of individually impaired loans 2,046,672 $ 1,236,074  
Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Loans with an allowance recorded     173,925
Residential First Mortgage | Commercial Real Estate Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Loans with no related allowance recorded 1,223,436   1,486,469
Loans with an allowance recorded 173,925   174,776
Amount of allowance for loan losses allocated 35,859   35,859
Average of individually impaired loans 1,529,303 1,217,094  
Commercial and Multi-Family | Commercial Real Estate Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Loans with no related allowance recorded 488,654   488,003
Average of individually impaired loans 488,329 222,534  
Home equity & other consumer | Consumer      
Financing Receivable, Past Due [Line Items]      
Loans with no related allowance recorded 39,574   $ 18,507
Average of individually impaired loans $ 29,040 $ 18,980