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Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ (10,687) $ (2,920) $ (14,740) $ (1,825)
Other comprehensive (loss) gain before reclassifications 4,185 (9,178) 8,415 (10,295)
Reclassified from AOCI (235) 20 (412) 42
Other comprehensive income (loss), net of tax 3,950 (9,158) 8,003 (10,253)
Ending balance (6,737) (12,078) (6,737) (12,078)
Available-for-Sale Securities
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (9,645) (1,182) (13,640) (283)
Other comprehensive (loss) gain before reclassifications 4,104 (9,206) 8,236 (10,178)
Reclassified from AOCI (195) 71 (332) 144
Other comprehensive income (loss), net of tax 3,909 (9,135) 7,904 (10,034)
Ending balance (5,736) (10,317) (5,736) (10,317)
Employee Benefit Plan
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (1,042) (1,738) (1,100) (1,542)
Other comprehensive (loss) gain before reclassifications 81 28 179 (117)
Reclassified from AOCI (40) (51) (80) (102)
Other comprehensive income (loss), net of tax 41 (23) 99 (219)
Ending balance $ (1,001) $ (1,761) $ (1,001) $ (1,761)