NONINTEREST INCOME - Other income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue from External Customer [Line Items]
Other income	$ 5,908	$ 5,196
Managed service fees
Revenue from External Customer [Line Items]
Other income	2,826	2,619
Currency preparation
Revenue from External Customer [Line Items]
Other income	725	683
ATM insurance
Revenue from External Customer [Line Items]
Other income	590	697
Miscellaneous products and services
Revenue from External Customer [Line Items]
Other income	$ 1,767	$ 1,197