Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current income taxes:
Federal	$ 2,031	$ 1,627	$ 1,238
State	98	63	60
Total current tax expense	2,129	1,690	1,298
Deferred income tax expense (benefit)	(296)	(857)	(1,105)
Income tax expense	$ 1,833	$ 833	$ 193