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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Troubled Debt Restructuring (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Troubled Debt Restructuring    
Accruing troubled debt restructured loans $ 5,975 $ 8,016
Nonaccrual troubled debt restructured loans 3,422 4,384
Total troubled debt restructured loans $ 9,397 $ 12,400