Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Comprehensive Income Details
Unrealized gain (loss) on securities available for sale	$ 4,794	$ 3,896	$ 4,047
Deferred tax asset (liability)	(1,870)	(1,520)	(1,578)
Net unrealized gain (loss) on securities available for sale	2,924	2,376	2,469
Additional pension liability	(17,789)	(18,278)	(10,460)
Deferred tax asset	7,029	7,220	4,132
Net additional pension liability	(10,760)	(11,058)	(6,328)
Total accumulated other comprehensive income (loss)	$ (7,836)	$ (8,682)	$ (3,859)