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Accumulated Other Comprehensive Loss - Reclassifications from Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net securities (gains) losses reclassified into earnings   $ (22) $ 52 $ (22)
Related income tax expense (benefit) $ 178 674 370 1,157
Total reclassifications $ (444) (1,542) (988) (2,688)
Amount Reclassified from Accumulated Other Comprehensive Loss [Member] | Securities Available for Sale [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net securities (gains) losses reclassified into earnings   (22) 52 (22)
Related income tax expense (benefit)   7 (18) 7
Total reclassifications   $ (15) $ 34 $ (15)