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Accumulated Other Comprehensive Loss - Reclassifications from Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net securities losses (gains) reclassified into earnings $ 55 $ (696)
Related income tax (benefit) expense 956 3,499
Total reclassifications (2,655) (7,631)
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 losses (gains) reclassified into earnings 55 (696)
Related income tax (benefit) expense (19) 236
Total reclassifications $ 36 $ (460)