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Derivatives and Hedging Pre-Tax Net Gains (Losses) on Fair Value Hedges (Detail) (Interest Rate Swap [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Interest Rate Swap [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Gain (Loss) on Derivatives $ (15,230)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1] $ (15,139)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1]
Increase (Decrease) to Basis of Hedged Assets $ 15,235us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1] $ 14,775us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1]
[1] Net gain (loss) on loans represent the change in fair value caused by fluctuations in interest rates; differences relate to ineffectiveness associated with the fair value hedge.