ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]
Unrealized gain (loss) on investment securities	$ 10,975	$ 7,808
Unrealized gain (loss) on derivatives	202	(1,293)
Retirement obligation	0	0
Foreign Currency Translation		(20)
Total	11,177	6,495
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]
Unrealized gain (loss) on investment securities	24	0
Unrealized gain (loss) on derivatives	0	0
Retirement obligation	(317)	(350)
Foreign Currency Translation		0
Total	(293)	(350)
Transactions Pre-tax
Unrealized gain (loss) on investment securities	10,951	7,808
Unrealized gain (loss) on derivatives	202	(1,293)
Unfunded pension obligation	317	350
Foreign currency translation		(20)
Total	11,470	6,845
Transactions Tax-effect
Unrealized gain (loss) on investment securities	(3,908)	(2,800)
Unrealized gain (loss) on derivatives	(74)	477
Retirement obligation	(117)	(167)
Foreign currency translation		0
Total	(4,099)	(2,490)
Transactions Net of tax
Unrealized gain (loss) on investment securities	7,043	5,008
Unrealized gain (loss) on derivatives	128	(816)
Retirement obligation	200	183
Foreign currency translation	0	(20)
Total	7,371	4,355
Balances Net of tax
Unrealized gain (loss) on investment securities	2,110	2,502	$ (4,933)	$ (2,506)
Unrealized gain (loss) on cash flow hedges	(1,471)	(1,765)	(1,599)	(949)
Retirement obligation	(23,848)	(17,721)	(24,048)	(17,904)
Foreign currency translation		(70)		(50)
Total	$ (23,209)	$ (17,054)	$ (30,580)	$ (21,409)