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Summary of Accumulated Other Comprehensive Loss, Net of Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Unrealized Loss on Securities $ (283) $ (5,741) $ (11,213)
Unrealized Loss on Cash Flow Hedge Derivative     (20)
Benefit Plan Liability (1,542) (1,587) (957)
Accumulated Other Comprehensive Loss $ (1,825) $ (7,328) $ (12,190)