OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Unrealized gains on available-for- sale securities, before tax amount [Abstract]
Unrealized gains (losses) arising during holding period, before tax amount	$ (9,340)		$ 26,016		$ (61,640)
Reclassification adjustment for net (gains) realized in net income, before tax amount	(136)	[1]	(37)	[1]	(46)
Recognized employee benefit plan net	12,482	[2]	(48,187)	[2]	27,128
Other comprehensive income (loss), before tax amount	3,006		(22,208)		(34,558)
Unrealized gains on available-for- sale securities, tax (expense) benefit [Abstract]
Unrealized gains (losses) arising during holding period, tax (expense) benefit	3,577		(9,965)		23,603
Reclassification adjustment for net (gains) losses realized in net income, tax (expense) benefit	52	[1]	14	[1]	18
Change in pension funding status cost, tax (expense) benefit	(4,774)	[2]	18,432	[2]	(10,376)
Other comprehensive (loss) income, tax (expense) benefit	(1,145)		8,481		13,245
Unrealized gains on available-for- sale securities, net of tax amount [Abstract]
Unrealized gains (losses) arising during holding period, net of tax amount	(5,763)		16,051		(38,037)
Reclassification adjustment for net (gains) losses realized in net income, net of tax amount	(84)	[1]	(23)	[1]	(28)
Change in pension funding status cost, net of tax amount	7,708	[2]	(29,755)	[2]	16,752
Other comprehensive (loss) income	$ 1,861		$ (13,727)		$ (21,313)

[1] Reclassification adjustments for net gains on available-for-sale securities are reported as security gains, net on the consolidated statement of income.

[2] Recognized employee benefit plan net periodic benefit cost include amortization of unrecognized transition amount, recognized prior service cost and recognized net loss. For more information, see Footnote 14 - Pension, Other Post Retirement Benefit and Profit Sharing Plans.