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Accumulated Other Comprehensive Loss - Reclassifications from Accumulated Other Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense $ (674) $ 830 $ (1,157) $ 559
Net income 1,542 261 2,688 1,244
Amount Reclassified from Accumulated Other Comprehensive Loss [Member] | Securities Available for Sale [Member]
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gains on sale of securities available for sale (22)    (22)   
Income tax expense 7    7   
Net income $ (15)    $ (15)