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Accumulated Other Comprehensive Income - Schedule of Changes in Component of Accumulated other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity [Abstract]      
Net Unrealized Gains (Losses) on Securities, Beginning Balance $ 1,770 $ 3,166 $ 977
Other comprehensive income (loss) before reclassifications, Net Unrealized gains (losses) on Investment Securities (3,482) (111) 1,774
Amounts reclassified from accumulated other comprehensive income (loss), Net Unrealized gains (losses) on Investment Securities 0 (1,285) (59)
Deferred tax adjustment, Net Unrealized gains (losses) on Investment Securities 583   474
Change during period, Net Unrealized gains (losses) on Investment Securities (2,899) (1,396) 2,189
Net Unrealized Gains (Losses) on Securities, Ending Balance (1,129) 1,770 3,166
Adjustments Related to Pension Benefits, Beginning Balance (2,629) (2,175) (843)
Other comprehensive income (loss) before reclassifications, Adjustments Related to Pension Benefits 2,364 (454) (898)
Amounts reclassified from accumulated other comprehensive income (loss), Adjustments Related to Pension Benefits        
Deferred tax adjustment, Adjustments Related to Pension Benefits 90   (434)
Change during period, Adjustments Related to Pension Benefits 2,454 (454) (1,332)
Adjustments Related to Pension Benefits, Ending Balance (175) (2,629) (2,175)
Accumulated Other Comprehensive Income (Loss), Beginning Balance (859) 991 134
Other comprehensive income (loss) before reclassifications, Accumulated Other Comprehensive Income (Loss) (1,118) (565) 876
Amounts reclassified from accumulated other comprehensive income (loss), Accumulated Other Comprehensive Income (Loss)   (1,285) (59)
Deferred tax adjustment, Accumulated Other Comprehensive Income (Loss) 673   40
Change during period, Accumulated Other Comprehensive Income (Loss) (445) (1,850) 857
Accumulated Other Comprehensive Income (Loss), Ending Balance $ (1,304) $ (859) $ 991