SHAREHOLDERS’ EQUITY AND EARNINGS PER COMMON SHARE - Components of AOCI (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (4,554)	$ (4,326)
Net unrealized loss on AFS securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other accumulated comprehensive income (loss), before tax:	(2,741)	(3,269)
Income taxes related to items of accumulated other comprehensive loss:	(1,030)	(1,144)
Net unrealized loss on derivative hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other accumulated comprehensive income (loss), before tax:	(3,604)	(2,766)
Income taxes related to items of accumulated other comprehensive loss:	(1,354)	(968)
Net unrealized loss on post-retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other accumulated comprehensive income (loss), before tax:	(950)	(622)
Income taxes related to items of accumulated other comprehensive loss:	$ (357)	$ (219)