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Accumulated Other Comprehensive Loss - Reclassifications from Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net securities (gains) losses reclassified into earnings $ (6) $ 52
Related income tax expense (benefit) 426 192
Total reclassifications (1,099) (544)
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 (6) 52
Related income tax expense (benefit) 2 (18)
Total reclassifications $ (4) $ 34