Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Notes to Financial Statements
Unrealized gain (loss) on securities available for sale	$ 3,290	$ 3,896	$ 2,478
Deferred tax asset (liability)	(1,283)	(1,520)	(966)
Net unrealized gain (loss) on securities available for sale	2,007	2,376	1,512
Additional pension liability	(3,579)	(18,278)	(10,905)
Deferred tax asset	1,396	7,220	4,308
Net additional pension liability	(2,183)	(11,058)	(6,597)
Total accumulated other comprehensive income (loss)	$ (176)	$ (8,682)	$ (5,085)