Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 12,653	$ 5,341	$ 5,092
Available-for-sale securities:
Unrealized gains arising during the year	3,733	4,678	2,207
Reclassification adjustment for gains realized in net income		(884)	(45)
Other than temporary impairment		10	226
Income tax expense	(1,456)	(1,457)	(914)
Total other comprehensive income, net of tax	2,277	2,347	1,474
Total comprehensive income	$ 14,930	$ 7,688	$ 6,566