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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Component of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Equity [Abstract]    
Net Unrealized Gains (Losses) on Securities, Beginning Balance $ 1,770 $ 3,166
Net unrealized gains (losses) on investment securities (3,194) 122
Reclassification adjustment, Net Unrealized Gains (Losses) on Securities   (1,285)
Net Unrealized Gains (Losses) on Securities, Ending Balance (1,424) 2,003
Adjustments Related to Pension Benefits, Beginning Balance (2,629) (2,175)
Net unrealized gains (losses) on investment securities, Adjustments Related to Pension Benefits      
Reclassification adjustment, Adjustments Related to Pension Benefits     
Adjustments Related to Pension Benefits, Ending Balance (2,629) (2,175)
Accumulated Other Comprehensive Income (Loss), Beginning Balance (859) 991
Net unrealized gains (losses) on investment securities, Accumulated Other Comprehensive Income (Loss) (3,194) 122
Reclassification adjustment, Accumulated Other Comprehensive Income (Loss)   (1,285)
Accumulated Other Comprehensive Income (Loss), Ending Balance $ (4,053) $ (172)