Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
The components of accumulated other comprehensive income (loss):
Unrealized gain (loss) on securities available for sale	$ (2,018)	$ 3,290	$ 4,794
Deferred tax asset (liability)	787	(1,283)	(1,870)
Net unrealized gain (loss) on securities available for sale	(1,231)	2,007	2,924
Additional pension liability	(3,545)	(3,579)	(17,789)
Deferred tax asset	1,383	1,396	7,029
Net additional pension liability	(2,162)	(2,183)	(10,760)
Total accumulated other comprehensive income (loss)	$ (3,393)	$ (176)	$ (7,836)