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LOANS - Summary of impaired loans (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Financing Receivable, Past Due [Line Items]          
Loans with no related allowance recorded $ 1,712,099   $ 1,712,099   $ 1,992,979
Loans with an allowance recorded 172,489   172,489   174,776
Amount of allowance for loan losses allocated 35,859   35,859   35,859
Average of individually impaired loans 1,717,360 $ 1,886,621 1,794,841 $ 1,708,976  
Commercial Portfolio Segment          
Financing Receivable, Past Due [Line Items]          
Loans with an allowance recorded         174,776
Residential First Mortgage | Commercial Real Estate Portfolio Segment          
Financing Receivable, Past Due [Line Items]          
Loans with no related allowance recorded 1,206,747   1,206,747   1,486,469
Loans with an allowance recorded 172,489   172,489   174,776
Amount of allowance for loan losses allocated 35,859   35,859   35,859
Average of individually impaired loans 1,211,139 1,745,580 1,283,046 1,534,737  
Commercial and Multi-Family Real Estate | Commercial Real Estate Portfolio Segment          
Financing Receivable, Past Due [Line Items]          
Loans with no related allowance recorded 487,252   487,252   488,003
Average of individually impaired loans 488,051 111,267 488,190 148,084  
Home Equity and Other Consumer | Consumer          
Financing Receivable, Past Due [Line Items]          
Loans with no related allowance recorded 18,100   18,100   $ 18,507
Average of individually impaired loans $ 18,170 $ 29,774 $ 23,605 $ 26,155