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LOANS - Summary of impaired loans (Detail) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]      
Loans with no related allowance recorded $ 1,176,319   $ 1,147,126
Loans with an allowance recorded 177,366   177,641
Amount of allowance for loan losses allocated 35,859   35,859
Average of individually impaired loans 1,458,608 $ 1,241,581  
Residential First Mortgage | Commercial Real Estate Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Loans with no related allowance recorded 935,685   904,730
Loans with an allowance recorded 177,366   177,641
Amount of allowance for loan losses allocated 35,859   35,859
Average of individually impaired loans 1,217,094 1,231,715  
Commercial and Multi-Family | Commercial Real Estate Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Loans with no related allowance recorded 221,717   223,352
Average of individually impaired loans 222,534    
Home equity & other consumer | Consumer      
Financing Receivable, Past Due [Line Items]      
Loans with no related allowance recorded 18,917   $ 19,044
Average of individually impaired loans $ 18,980 $ 9,866