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LOANS - Summary of impaired loans (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Financing Receivable, Past Due [Line Items]          
Loans with no related allowance recorded $ 1,722,618   $ 1,722,618   $ 1,992,979
Loans with an allowance recorded 173,353   173,353   174,776
Amount of allowance for loan losses allocated 35,859   35,859   35,859
Average of individually impaired loans 1,910,781 $ 1,458,608 1,996,440 $ 1,477,678  
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 1,215,530   1,215,530   1,486,469
Loans with an allowance recorded 173,353   173,353   174,776
Amount of allowance for loan losses allocated 35,859   35,859   35,859
Average of individually impaired loans 1,393,122 1,217,094 1,482,496 1,231,099  
Commercial and Multi-Family | Commercial Real Estate Portfolio Segment          
Financing Receivable, Past Due [Line Items]          
Loans with no related allowance recorded 488,849   488,849   488,003
Average of individually impaired loans 488,752 222,534 488,504 227,226  
Home equity & other consumer | Consumer          
Financing Receivable, Past Due [Line Items]          
Loans with no related allowance recorded 18,239   18,239   $ 18,507
Average of individually impaired loans $ 28,907 $ 18,980 $ 25,440 $ 19,353