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Comprehensive Income - Other Comprehensive Income (Loss) and Related Tax Effects (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Unrealized gain (loss) on investment securities available-for-sale $ (3,882) $ 1,223 $ 4,873
Other-than-temporary impairment on investment securities     78
Net change in benefit plans accrued expense 3,642 (924) (1,497)
Reclassification Out of Accumulated Other Comprehensive Income [Member]
      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net gain on the sale of investment securities available-for-sale (163) (317) (666)
Unrealized gain (loss) on investment securities available-for-sale (3,882) 1,223 4,873
Other-than-temporary impairment on investment securities     78
Amortization of actuarial loss (gain) 276 136 82
Actuarial (loss) gain 3,366 (1,060) (1,579)
Net change in benefit plans accrued expense 3,642 (924) (1,497)
Other comprehensive income (loss) gain before taxes (403) (18) 2,788
Income taxes (5) (6) 948
Other comprehensive income (loss) $ (408) $ (12) $ 1,840