Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements Of Comprehensive Income
Net income (loss)	$ (23,406)	$ 13,642	$ 9,982
Unrealized gains on securities available for sale:
Unrealized holding gains arising during the period, pretax	32	1,492	672
Tax expense	(12)	(583)	(261)
Reclassification to realized (gains)	(638)	(74)	(26)
Tax expense	249	29	10
Postretirement Plans:
Net gain (loss) arising during period	13,975	(7,798)	(2,307)
Tax (expense) benefit	(5,542)	3,080	911
Amortization of unrecognized net actuarial loss	545	393	531
Tax expense	(212)	(155)	(210)
Amortization of prior service cost and transition obligation	179	32	35
Tax expense	(70)	(13)	(13)
Other comprehensive income (loss)	8,506	(3,597)	(658)
Comprehensive income (loss)	$ (14,900)	$ 10,045	$ 9,324