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Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ (5,247) $ (5,605)
Other comprehensive gain (loss) before reclassifications (529) 949
Reclassified from AOCI 43 65
Other comprehensive (loss) income, net of tax (486) 1,014
Ending balance (5,733) (4,591)
Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (3,885) (4,266)
Other comprehensive gain (loss) before reclassifications (451) 1,011
Reclassified from AOCI (1) 14
Other comprehensive (loss) income, net of tax (452) 1,025
Ending balance (4,337) (3,241)
Employee Benefit Plan    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (1,362) (1,339)
Other comprehensive gain (loss) before reclassifications (78) (62)
Reclassified from AOCI 44 51
Other comprehensive (loss) income, net of tax (34) (11)
Ending balance $ (1,396) $ (1,350)