Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 3,752	$ 3,083	$ 12,112	$ 11,536
Other comprehensive income before tax	903	699	2,500	5,644
Tax expense related to other comprehensive income	(343)	(266)	(950)	(2,145)
Other comprehensive income, net of tax	560	433	1,550	3,499
Comprehensive income	4,312	3,516	13,662	15,035
Unrealized gains (losses) on securities for which a portion of an other than temporary impairment has been recorded in earnings before tax [Member]
Other comprehensive income (loss), before tax
Unrealized holding gains (losses) arising during the period	139	(225)	31	18
Less: reclassification adjustment for impairment losses realized in net income	6	22	179	22
Net unrealized gains (losses) on securities before tax expense	145	(203)	210	40
Unrealized gains (losses) on securities without other than temporary impairment before tax [Member]
Other comprehensive income (loss), before tax
Unrealized holding gains (losses) arising during the period	758	902	2,536	5,604
Less: reclassification adjustment for net gains realized in net income	0	0	(246)	0
Net unrealized gains (losses) on securities before tax expense	$ 758	$ 902	$ 2,290	$ 5,604