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Accumulated Other Comprehensive Loss - Reclassifications from Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net securities gains reclassified into earnings   $ (6)
Related income tax expense $ 639 426
Total reclassifications $ (1,543) (1,099)
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 reclassified into earnings   (6)
Related income tax expense   2
Total reclassifications   $ (4)