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FINANCIAL INSTRUMENTS - Financial instrument liabilities with off-balance sheet credit risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Letters of credit $ 3,865 $ 4,095
Financial instrument liabilities    
Residential 6,751 16,769
Home equity lines of credit 29,872 29,031
Commercial 19,051 26,145
Land 14 64
Real estate secured 55,688 72,009
Commercial and industrial 77,219 63,942
Municipal 250 188
Consumer 1,583 1,574
Unadvanced portions of loans 134,740 137,713
Commitments to originate loans 18,397 28,222
Letters of credit 3,865 4,905
Total $ 157,002 $ 170,840