STOCKHOLDERS' EQUITY (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Accumulated other comprehensive loss	$ 9,068	$ 6,579	$ (2,009)	$ (10,435)
Net unrealized holding loss (gain) on AFS securities:
Other accumulated comprehensive income (loss), before tax:	25,330	15,993
Income taxes related to items of accumulated other comprehensive income:	(9,682)	(6,077)
Accumulated other comprehensive loss	15,648	9,916	(1,976)	(5,776)
Net loss on effective cash flow hedging derivatives
Other accumulated comprehensive income (loss), before tax:	(7,200)	(3,299)
Income taxes related to items of accumulated other comprehensive income:	2,902	1,330
Accumulated other comprehensive loss	(4,298)	(1,969)	1,335	(1,366)
Net unrealized holding loss on pension plans
Other accumulated comprehensive income (loss), before tax:	(3,822)	(2,291)
Income taxes related to items of accumulated other comprehensive income:	1,540	923
Accumulated other comprehensive loss	$ (2,282)	$ (1,368)	$ (1,368)	$ (1,368)