CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Pension and other post retirement obligations:
Amortization of actuarial losses included in net periodic pension cost, gross	$ 1,011	$ 924	$ 3,032	$ 2,774
Tax effect	(392)	(359)	(1,176)	(1,076)
Amortization of actuarial losses included in net periodic pension cost, net	619	565	1,856	1,698
Amortization of prior service cost included in net periodic pension cost, gross	(30)	(242)	(91)	(727)
Tax effect	11	94	35	282
Amortization of prior service cost included in net periodic pension cost, net	(19)	(148)	(56)	(445)
Other comprehensive income related to pension and other post retirement obligations, net of taxes	600	417	1,800	1,253
Unrealized gains on securities:
Net unrealized holding (losses) gains arising during period, gross	(1,852)	14,067	(71,501)	58,452
Tax effect	567	(5,325)	26,746	(22,545)
Net unrealized holding (losses) gains arising during period, net	(1,285)	8,742	(44,755)	35,907
Reclassification adjustment for net gains included in net income, gross	0	(291)	(63,799)	(291)
Tax effect	0	102	24,019	102
Reclassification adjustment for net gains included in net income, net	0	(189)	(39,780)	(189)
Other comprehensive loss related to unrealized (loss) gain on available-for-sale securities, net of taxes	(1,285)	8,553	(84,535)	35,718
Other comprehensive (loss) income, net of tax	(685)	8,970	(82,735)	36,971
Net income	21,989	18,367	63,352	58,264
Comprehensive income (loss)	21,304	27,337	(19,383)	95,235
Accumulated Other Comprehensive Income By Component:
Unrealized loss for pension and other postretirement obligations	(42,292)		(42,292)		(45,232)
Tax effect	16,307		16,307		17,447
Net unrealized loss for pension and other postretirement obligations	(25,985)		(25,985)		(27,785)
Unrealized (loss) gain on available-for-sale securities	(3,844)		(3,844)		131,456
Tax effect	1,428		1,428		(49,337)
Net unrealized (loss) gain on available-for-sale securities	(2,416)		(2,416)		82,119
Accumulated other comprehensive (loss) income	$ (28,401)		$ (28,401)		$ 54,334