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Derivative Instruments - Effect of Corporation's Derivative Financial Instruments on Income Statement (Detail) (Interest Rate Contracts [Member], Other Income [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Interest Rate Contracts [Member] | Other Income [Member]
   
Derivative [Line Items]    
Interest Rate Products $ (14) $ 136