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SERVICING RIGHTS - Small Business Administration Servicing Rights (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Balance at beginning of year $ 1,856 $ 1,496 $ 788
Additions 127 761 877
Amortization, including prepayments (298) (318) (157)
Impairment (27) (83) (12)
Balance at end of year $ 1,658 $ 1,856 $ 1,496