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Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ (6,198) $ (6,737) $ (5,605) $ (14,740)
Other comprehensive gain before reclassifications 2,535 267 1,926 8,683
Reclassified from AOCI (75) 22 (59) (391)
Other comprehensive income, net of tax 2,460 289 1,867 8,292
Ending balance (3,738) (6,448) (3,738) (6,448)
Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (4,899) (5,736) (4,266) (13,640)
Other comprehensive gain before reclassifications 2,433 186 1,682 8,422
Reclassified from AOCI (24) 63 94 (269)
Other comprehensive income, net of tax 2,409 249 1,776 8,153
Ending balance (2,490) (5,487) (2,490) (5,487)
Employee Benefit Plan        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (1,299) (1,001) (1,339) (1,100)
Other comprehensive gain before reclassifications 102 81 244 261
Reclassified from AOCI (51) (41) (153) (122)
Other comprehensive income, net of tax 51 40 91 139
Ending balance $ (1,248) $ (961) $ (1,248) $ (961)