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

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Nominal or face amount used to calculate payments on the derivative asset.

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Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

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Fixed interest rate related to the interest rate derivative.

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The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Income earned by providing the use of assets to an outside party in exchange for a payment or series of payments that is nonoperating in nature.

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Recognized net reduction to interest expense.

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Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013	Jun. 30, 2014
Commitments And Contingencies [Line Items]
Net rental expense		$ 21,200,000us-gaap_OperatingLeasesRentExpenseNet	$ 19,900,000us-gaap_OperatingLeasesRentExpenseNet	$ 23,800,000us-gaap_OperatingLeasesRentExpenseNet
Net of rental income		3,100,000us-gaap_RentalIncomeNonoperating	3,300,000us-gaap_RentalIncomeNonoperating	2,500,000us-gaap_RentalIncomeNonoperating
Operating lease termination period	20 years
Gain recognized on lease termination		11,300,000us-gaap_GainLossOnContractTermination
Aggregate fair value of net liability position		11,500,000
Collateral posted		31,700,000
Interest Rate Swaps [Member]
Commitments And Contingencies [Line Items]
Accumulated net after-tax losses related to effective cash flow hedges	6,300,000	14,500,000	6,300,000
Estimated amount of interest rate derivatives to be reclassified to interest expense		6,400,000
Recognized a net reduction to interest expense		100,000	584,000	561,000
Subordinated Notes Due September Twenty Seven Two Thousand Twenty Three [Member]
Commitments And Contingencies [Line Items]
Debt instrument percentage		5.125%
Derivatives Designated as Hedging Instruments [Member]
Commitments And Contingencies [Line Items]
Notional amount of interest rate derivatives	1,191,591,000	1,140,406,000	1,191,591,000
Derivatives Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Commitments And Contingencies [Line Items]
Notional amount of derivative asset		482,000,000
Derivatives Designated as Hedging Instruments [Member] \| Fixed Rate At Approximately Five Point Eleven Percent [Member] \| Consumer And Commercial Money Market Deposit Accounts [Member]
Commitments And Contingencies [Line Items]
Derivative, Fixed Interest Rate		5.11%
Derivatives Not Designated as Hedging Instrument [Member]
Commitments And Contingencies [Line Items]
Notional amount of interest rate derivatives	306,616,000	419,706,000	306,616,000
Minimum [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Commitments And Contingencies [Line Items]
Derivative, Fixed Interest Rate		2.51%
Maximum [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Commitments And Contingencies [Line Items]
Derivative, Fixed Interest Rate		2.97%
Consumer Repurchase Agreements And Money Market Deposit Accounts [Member] \| Interest Rate Swaps Due July Fifteen Two Thousand Fifteen [Member]
Commitments And Contingencies [Line Items]
Notional amount of interest rate derivatives		100,000,000
Consumer Repurchase Agreements And Money Market Deposit Accounts [Member] \| Interest Rate Swaps Due July Twelve Two Thousand Twelve [Member]
Commitments And Contingencies [Line Items]
Notional amount of interest rate derivatives		100,000,000
Consumer And Commercial Money Market Deposit Accounts [Member] \| Derivatives Designated as Hedging Instruments [Member]
Commitments And Contingencies [Line Items]
Derivative, Cap Interest Rate		7.44%
Consumer And Commercial Money Market Deposit Accounts [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Commitments And Contingencies [Line Items]
Notional amount of derivative asset		200,000,000
Consumer And Commercial Money Market Deposit Accounts [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Fixed Rate At Approximately Four Point Seven Three Percent [Member] \| Interest Rate Swaps [Member]
Commitments And Contingencies [Line Items]
Derivative, Fixed Interest Rate		4.73%
Consumer And Commercial Money Market Deposit Accounts [Member] \| Minimum [Member] \| Derivatives Not Designated as Hedging Instrument [Member]
Commitments And Contingencies [Line Items]
Derivative, Cap Interest Rate		6.00%
Consumer And Commercial Money Market Deposit Accounts [Member] \| Maximum [Member] \| Derivatives Not Designated as Hedging Instrument [Member]
Commitments And Contingencies [Line Items]
Derivative, Cap Interest Rate		6.25%
Cash Flow Hedge [Member] \| Interest Rate Swaps [Member]
Commitments And Contingencies [Line Items]
Notional amount of interest rate derivatives		300,000,000
Cash Flow Hedge [Member] \| Forward-Settle Interest Rate Swap [Member]
Commitments And Contingencies [Line Items]
Notional amount of interest rate derivatives					65,000,000
Designated as Fair Value Hedge [Member] \| Consumer And Commercial Money Market Deposit Accounts [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Commitments And Contingencies [Line Items]
Notional amount of interest rate derivatives		8,400,000
Designated as Fair Value Hedge [Member] \| Consumer And Commercial Money Market Deposit Accounts [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Interest Rate Swaps Due September Twenty Seven Two Thousand Twenty Three [Member]
Commitments And Contingencies [Line Items]
Notional amount of derivative asset		125,000,000
Designated as Fair Value Hedge [Member] \| Market Linked Certificates Of Deposit [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Commitments And Contingencies [Line Items]
Notional amount of interest rate derivatives						$ 25,000,000