Income Taxes - Schedule of Effective Income Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]                    
Income tax expense at federal statutory rate                 $ 1,848 $ 1,000
Increase (decrease) resulting from:                    
Tax-exempt interest                 (394) (375)
State income tax expense, net of federal income taxes                 190 102
Other                 (135) 18
Total $ 303 $ 350 $ 512 $ 344 $ 588 $ 517 $ 622 $ (982) $ 1,509 $ 745