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Accumulated Other Comprehensive Loss - Reclassifications from Accumulated Other Comprehensive Loss (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net securities (gains) losses reclassified into earnings     $ (6,000) $ 52,000
Related income tax expense (benefit) $ 592,000 $ 178,000 1,018,000 370,000
Total reclassifications (1,433,000) (444,000) (2,532,000) (988,000)
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     (6,000) 52,000
Related income tax expense (benefit)     2,000 (18,000)
Total reclassifications $ 0 $ 0 $ (4,000) $ 34,000