Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
The components of accumulated other comprehensive income (loss):
Unrealized gain (loss) on securities available for sale	$ 1,123	$ 3,290	$ 4,348
Deferred tax asset (liability)	(438)	(1,283)	(1,694)
Net unrealized gain (loss) on securities available for sale	685	2,007	2,654
Additional pension liability	(3,561)	(3,579)	(17,879)
Deferred tax asset	1,389	1,396	7,064
Net additional pension liability	(2,172)	(2,183)	(10,815)
Total accumulated other comprehensive income (loss)	$ (1,487)	$ (176)	$ (8,161)