Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Comprehensive Income Details
Unrealized gain (loss) on securities available for sale	$ (1,718)	$ (2,021)	$ 2,982
Deferred tax asset (liability)	671	789	(1,163)
Net unrealized gain (loss) on securities available for sale	(1,047)	(1,232)	1,819	2,007
Additional pension asset (liability)	5,081	5,135	(3,576)
Deferred tax asset (liability)	(1,970)	(2,003)	1,395
Net additional pension asset (liability)	3,111	3,132	(2,181)	(2,183)
Total accumulated other comprehensive income (loss)	$ 2,064	$ 1,900	$ (362)	$ (176)