LOANS - Impaired Loans Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Impaired loans summary
Nonaccrual loans	$ 52,885	$ 47,892
Accruing loans past due 90 days or more	907	375
Restructured loans - nonaccrual	1,944	9,446
Restructured loans - accruing	3,055	13,093
Total nonperforming loans	58,791	70,806
Originated
Impaired loans summary
Nonaccrual loans	49,543	43,797
Accruing loans past due 90 days or more	85	375
Restructured loans - nonaccrual	901	8,063
Restructured loans - accruing	8	4,255
Total nonperforming loans	50,537	56,490
Acquired
Impaired loans summary
Nonaccrual loans	3,342	4,095
Accruing loans past due 90 days or more	822	0
Restructured loans - nonaccrual	1,043	1,383
Restructured loans - accruing	3,047	8,838
Total nonperforming loans	$ 8,254	$ 14,316