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Income Taxes - Components of income tax expense (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]      
Current Federal income tax expense $ 1,196 $ 686 $ 1,472
Current State income tax expense (benefit) 49 (95) 496
Total current income tax expense 1,245 591 1,968
Deferred Federal income tax expense (benefit) 249 893 (1,677)
Deferred State income tax expense (benefit) 191 377 (660)
Total deferred income tax expense (benefit) 440 1,270 (2,337)
Provision (benefit) from income taxes, Federal 1,445 1,579 (205)
Provision (benefit) from income taxes, State 240 282 (164)
Provision for income taxes $ 1,685 $ 1,861 $ (369)