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BORROWED FUNDS - Others (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Federal Reserve Bank of Boston    
Borrowed funds    
Percentage of carrying value pledged as collateral 82.00%  
Amortized borrowing capacity $ 54,900,000 $ 70,600,000
Amount outstanding $ 0 $ 0
Federal Home Loan Bank Advances | First mortgage loans on owner-occupied residential property    
Borrowed funds    
Percentage of carrying value pledged as collateral on FHLB advances 77.00%  
Other Loans    
Borrowed funds    
Percentage of carrying value pledged as collateral on FHLB advances 64.00%