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Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ (5,605) $ (14,740) $ (1,825)
Other comprehensive (loss) gain before reclassifications 471 10,620 (12,759)
Reclassified from AOCI (113) (1,485) (156)
Other comprehensive income (loss), net of tax 358 9,135 (12,915)
Ending balance (5,247) (5,605) (14,740)
Available-for-Sale Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (4,266) (13,640) (283)
Other comprehensive (loss) gain before reclassifications 291 10,697 (13,406)
Reclassified from AOCI 90 (1,323) 49
Other comprehensive income (loss), net of tax 381 9,374 (13,357)
Ending balance (3,885) (4,266) (13,640)
Employee Benefit Plan      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (1,339) (1,100) (1,542)
Other comprehensive (loss) gain before reclassifications 180 (77) 647
Reclassified from AOCI (203) (162) (205)
Other comprehensive income (loss), net of tax (23) (239) 442
Ending balance $ (1,362) $ (1,339) $ (1,100)