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LOANS - Components of impaired loans (Details) - Impaired Loans - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Non-accrual loans, excluding troubled debt restructured loans $ 5,450 $ 6,274
Non-accrual troubled debt restructured loans 1,154 2,262
Accruing troubled debt restructured loans 7,482 7,798
Total impaired loans 14,086 16,334
Commitments to lend additional amounts to impaired borrowers