Derivatives - Fair Values of Derivative Instruments on Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative Fair Value Of Asset	$ 23,251	$ 19,432
Derivative Fair Value Of Liability	23,968	20,860
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	500,000	300,000
Derivative Fair Value Of Liability	281	592
Derivatives Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	500,000	300,000
Derivative Fair Value Of Liability	281	592
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	1,002,350	1,002,930
Derivative Fair Value Of Asset	23,251	19,432
Derivative Fair Value Of Liability	23,687	20,268
Derivatives Not Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	780,871	747,754
Derivative Fair Value Of Asset	20,622	17,806
Derivative Fair Value Of Liability	21,007	18,419
Derivatives Not Designated as Hedging Instruments [Member] \| Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	83,430	80,438
Derivative Fair Value Of Asset	83	125
Derivative Fair Value Of Liability	162	208
Derivatives Not Designated as Hedging Instruments [Member] \| Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	55,128	52,238
Derivative Fair Value Of Asset	263	80
Derivative Fair Value Of Liability	336	250
Derivatives Not Designated as Hedging Instruments [Member] \| Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	38,853	33,068
Derivative Fair Value Of Asset	243	111
Derivative Fair Value Of Liability	167	44
Derivatives Not Designated as Hedging Instruments [Member] \| Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	44,068	89,432
Derivative Fair Value Of Asset	2,040	1,310
Derivative Fair Value Of Liability	$ 2,015	$ 1,347

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

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