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SERVICING RIGHTS - Composition of Total Income (Loss) From Servicing Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Transfers and Servicing [Abstract]      
Servicing fees for sold loans with servicing retained $ 19,642 $ 23,117 $ 11,739
Losses on the fair value and runoff of servicing rights (17,066) (17,732) (8,765)
Total income from servicing rights $ 2,576 $ 5,385 $ 2,974