ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Components of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ (7,517)	$ (2,244)	$ (4,173)
Other comprehensive income (loss) before reclassifications	(6,086)	(5,372)	2,005
Amounts reclassified	(70)	99	(76)
Net change in AOCI	(6,156)	(5,273)	1,929
Ending Balance	(13,673)	(7,517)	(2,244)
Unrealized Net Gains (Losses) on AFS Securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(3,321)	(1,185)	(6,554)
Other comprehensive income (loss) before reclassifications	(6,484)	(2,136)	5,445
Amounts reclassified	(352)	0	(76)
Net change in AOCI	(6,836)	(2,136)	5,369
Ending Balance	(10,157)	(3,321)	(1,185)
Unrealized Net Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(4,196)	(1,059)	2,381
Other comprehensive income (loss) before reclassifications	72	(3,236)	(3,440)
Amounts reclassified	282	99	0
Net change in AOCI	354	(3,137)	(3,440)
Ending Balance	(3,842)	(4,196)	(1,059)
Unrealized Net Gains (Losses) on Pension Obligation
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	0	0	0
Other comprehensive income (loss) before reclassifications	326	0	0
Amounts reclassified	0	0	0
Net change in AOCI	326	0	0
Ending Balance	$ 326	$ 0	$ 0