CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income	$ 41,190	$ 34,695	$ 40,491
Other comprehensive (loss) income:
Unrealized holding (losses) gains on available for sale securities during the period	(50,518)	7,859	52,506
Change in net unrealized loss on securities transferred to held to maturity	471	0	0
Noncredit portion of other-than-temporary impairment losses on the AFS securities	(10)	181	0
Reclassification adjustment for gain on sale of available for sale securities, included in net income	8,472	17,966	11,795
Reclassification of other-than-temporary impairment charges on available for sale securities, included in net income	(42)	(181)	0
Amortization of net actuarial loss, included in net periodic benefit cost	(2,787)	(2,022)	(1,466)
Amortization of prior service credit, included in net periodic benefit cost	(43)	(43)	(44)
Prior service cost adjustment due to plan amendments	357	0	0
Change in net actuarial gain (loss)	19,215	(10,362)	(9,804)
Other comprehensive (loss) income, before tax	(36,885)	(18,128)	32,329
Income tax benefit (expense) related to other items of comprehensive income	12,910	6,345	(11,315)
Other comprehensive (loss) income, net of tax	(23,975)	(11,783)	21,014
Comprehensive income	$ 17,215	$ 22,912	$ 61,505