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Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ (1,825) $ (7,328) $ (12,190)
Other comprehensive (loss) gain before reclassifications (13,070) 5,051 6,591
Reclassified from AOCI 155 452 (1,729)
Net comprehensive (loss) gain (12,915) 5,503 4,862
Ending balance (14,740) (1,825) (7,328)
Gains (Losses) On Cash Flow Hedges
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance     (20)
Other comprehensive (loss) gain before reclassifications     20
Net comprehensive (loss) gain     20
Available-for-Sale Securities
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (283) (5,741) (11,213)
Other comprehensive (loss) gain before reclassifications (13,307) 5,173 7,341
Reclassified from AOCI (50) 285 (1,869)
Net comprehensive (loss) gain (13,357) 5,458 5,472
Ending balance (13,640) (283) (5,741)
Employee Benefit Plan
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (1,542) (1,587) (957)
Other comprehensive (loss) gain before reclassifications 237 (122) (770)
Reclassified from AOCI 205 167 140
Net comprehensive (loss) gain 442 45 (630)
Ending balance $ (1,100) $ (1,542) $ (1,587)