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Derivatives - Fair Values of Derivative Instruments on Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Fair Value Of Asset	$ 19,432us-gaap_DerivativeAssets	$ 15,579us-gaap_DerivativeAssets
Derivative Fair Value Of Liability	20,860us-gaap_DerivativeLiabilities	15,006us-gaap_DerivativeLiabilities
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	300,000
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	300,000	0
Derivative Fair Value Of Asset	0	0
Derivative Fair Value Of Liability	592	0
Derivatives Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	300,000	0
Derivative Fair Value Of Asset	0	0
Derivative Fair Value Of Liability	592	0
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	1,002,930	763,568
Derivative Fair Value Of Asset	19,432	15,579
Derivative Fair Value Of Liability	20,268	15,006
Derivatives Not Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	747,754	650,667
Derivative Fair Value Of Asset	17,806	14,147
Derivative Fair Value Of Liability	18,419	13,777
Derivatives Not Designated as Hedging Instruments [Member] \| Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	80,438	19,736
Derivative Fair Value Of Asset	125	2
Derivative Fair Value Of Liability	208	2
Derivatives Not Designated as Hedging Instruments [Member] \| Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	52,238	45,910
Derivative Fair Value Of Asset	80	326
Derivative Fair Value Of Liability	250	115
Derivatives Not Designated as Hedging Instruments [Member] \| Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	33,068	25,956
Derivative Fair Value Of Asset	111	56
Derivative Fair Value Of Liability	44	107
Derivatives Not Designated as Hedging Instruments [Member] \| Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	89,432	21,299
Derivative Fair Value Of Asset	1,310	1,048
Derivative Fair Value Of Liability	$ 1,347	$ 1,005

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References+ Details