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FINANCIAL INSTRUMENTS - Financial instrument liabilities with off-balance sheet credit risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Letters of credit $ 4,700 $ 3,900
Financial instrument liabilities    
Residential 5,815 6,751
Home equity lines of credit 28,160 29,872
Commercial 14,858 19,051
Land 1,014 14
Real estate secured 49,847 55,688
Commercial and industrial 78,286 77,219
Municipal 2,499 250
Consumer 2,148 1,583
Unadvanced portions of loans 132,780 134,740
Commitments to originate loans 33,781 18,397
Letters of credit 4,657 3,865
Total $ 171,218 $ 157,002