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Accumulated Other Comprehensive Loss - Additional Information (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]        
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]        
Total reclassifications $ 0 $ 0 $ 4,000 $ (34,000)