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Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ (4,591) $ (10,687) $ (5,605) $ (14,740)
Other comprehensive (loss) gain before reclassifications (1,689) 4,185 (610) 8,415
Reclassified from AOCI 82 (235) 17 (412)
Net comprehensive (loss) gain (1,607) 3,950 (593) 8,003
Ending balance (6,198) (6,737) (6,198) (6,737)
Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (3,241) (9,645) (4,266) (13,640)
Other comprehensive (loss) gain before reclassifications (1,791) 4,104 (752) 8,236
Reclassified from AOCI 133 (195) 119 (332)
Net comprehensive (loss) gain (1,658) 3,909 (633) 7,904
Ending balance (4,899) (5,736) (4,899) (5,736)
Employee Benefit Plan        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (1,350) (1,042) (1,339) (1,100)
Other comprehensive (loss) gain before reclassifications 102 81 142 179
Reclassified from AOCI (51) (40) (102) (80)
Net comprehensive (loss) gain 51 41 40 99
Ending balance $ (1,299) $ (1,001) $ (1,299) $ (1,001)