Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Comprehensive Income [Abstract]
Net Income	$ 22,209	$ 21,118	$ 20,013
Unrealized Gains (Losses) on Securities:
Unrealized holding gains (losses) arising during the period, net of income tax effects of $2,255, $(1,062) and $824 for the years ended December 31, 2011, 2010 and 2009, respectively.	3,109	(1,463)	1,136
Less: Reclassification adjustment for realized gains included in net income, net of related income tax effects of $(40), $(1,217), and $(1,482) for the years ended December 31, 2011, 2010 and 2009, respectively.	(55)	(1,678)	(2,042)
Total Other Comprehensive Income (Loss)	3,054	(3,141)	(906)
Comprehensive Income	$ 25,263	$ 17,977	$ 19,107