CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Pension and other post retirement obligations:
Amortization of actuarial (gains)/losses included in net periodic pension cost, gross	$ 363	$ (77)
Tax effect	(140)	29
Amortization of actuarial (gains)/losses included in net periodic pension cost, net	223	(48)
Amortization of prior service cost included in net periodic pension cost, gross	(43)	(44)
Tax effect	16	17
Amortization of prior service cost included in net periodic pension cost, net	(27)	(27)
Other comprehensive income/(loss) related to pension and other post retirement obligations, net of taxes	196	(75)
Unrealized gains on available-for-sale securities:
Net unrealized holding gains arising during period, gross	31,389	40,558
Tax effect	(13,372)	(15,003)
Net unrealized holding gains arising during period, net	18,017	25,555
Other comprehensive income related to unrealized gains on available-for-sale securities, net of taxes	18,017	25,555
Other comprehensive income, net of tax	18,213	25,480
Net income	22,297	22,173
Comprehensive income	40,510	47,653
Accumulated Other Comprehensive Income By Component:
Unrealized loss for pension and other postretirement obligations	(26,621)		(26,941)
Tax effect	10,102		10,225
Net unrealized loss for pension and other postretirement obligations	(16,519)		(16,716)
Unrealized gain on available-for-sale securities	106,428		75,039
Tax effect	(40,976)		(27,603)
Net unrealized gain on available-for-sale securities	65,452		47,436
Accumulated other comprehensive income	$ 48,933		$ 30,720