Consolidated Statements of Comprehensive Income (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
Consolidated Statements Of Comprehensive Income
Net income	$ 6,333	$ 4,423	$ 15,021	$ 2,531
Unrealized gains on securities available for sale:
Unrealized holding gains (losses) arising during the period, pretax	(2,589)	635	(4,748)	1,536
Tax (expense) benefit	1,011	(249)	1,852	(599)
Reclassification to realized gains	(553)	(189)	(560)	(638)
Tax expense	216	74	218	249
Postretirement Plans:
Amortization of unrecognized net actuarial loss	15	82	34	465
Tax expense	(6)	(32)	(13)	(181)
Amortization of prior service cost and transition obligation		7		24
Tax expense		(3)		(10)
Other comprehensive income (loss)	(1,906)	325	(3,217)	846
Comprehensive income	$ 4,427	$ 4,748	$ 11,804	$ 3,377