CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Amounts Reclassified Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Amounts reclassified out of each component of accumulated other comprehensive income
Non-interest income	$ 5,946	$ 3,328
Tax expense	(1,481)	(1,796)
Amount Reclassified from Accumulated Other Comprehensive Income (loss)
Amounts reclassified out of each component of accumulated other comprehensive income
Net of tax	0	933
Net unrealized holding loss on AFS securities | Amount Reclassified from Accumulated Other Comprehensive Income (loss)
Amounts reclassified out of each component of accumulated other comprehensive income
Non-interest income	0	1,436
Tax expense	$ 0	$ (503)