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Other Comprehensive Income - Details about Accumulated Other Comprehensive Income Components (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Gain on sale of investment securities $ 6 $ 2 $ 374 $ 2
Income tax expense (1,629) (1,978) (5,960) (6,248)
Net Income 4,785 4,850 15,761 14,373
Net of tax 4,785 4,850 15,761 14,373
Securities Available-for-sale [Member] | Reclassification from Accumulated Other Comprehensive Income [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Gain on sale of investment securities 6   374  
Income tax expense (2)   (131)  
Net Income 4   243  
Net of tax $ 4   $ 243