Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Comprehensive Income [Abstract]
Net Income	$ 17,747	$ 17,638	$ 15,569
Other Comprehensive Income, Net of Tax
Unrealized holding gains (losses) on available for sale securities net of taxes of ($320) in 2012, $1,468 in 2011 and ($923) in 2010	(592)	2,725	(1,716)
Reclassification adjustment, net of taxes of ($4) in 2012, $9 in 2011 and ($7) in 2010	(7)	17	(12)
Net pension loss arising during the period, net of taxes of($405) in 2012, ($731) in 2011, and ($188) in 2010	(752)	(1,356)	(348)
Less amortization of prior service cost included in net periodic pension cost, net of taxes ($35) in 2012, ($35) in 2011 and ($39) in 2010	(66)	(66)	(73)
Other comprehensive income (loss), net of taxes of ($763) in 2012, $711 in 2011 and ($1,157) in 2010	(1,417)	1,320	(2,149)
Total Comprehensive Income	$ 16,330	$ 18,958	$ 13,420