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Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Interest rate swaps [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps
Interest rate swaps	579,276	497,210
Carrying Value [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Total assets	2,630,700	2,473,353
Total liabilities	13,393	23,966
Carrying Value [Member] | Government agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	333,013	359,300
Carrying Value [Member] | Residential mortgage-backed securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	1,289,624	887,598
Carrying Value [Member] | CMO/REMICs [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	389,208	571,960
Carrying Value [Member] | Municipal bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	600,724	625,429
Carrying Value [Member] | Other securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	4,738	5,100
Carrying Value [Member] | Investment securities - AFS [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	2,617,307	2,449,387
Carrying Value [Member] | Interest rate swaps [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	13,393	23,966
Interest rate swaps	13,393	23,966
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps
Total assets
Interest rate swaps
Total liabilities
Level 1 [Member] | Government agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 1 [Member] | Residential mortgage-backed securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 1 [Member] | CMO/REMICs [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 1 [Member] | Municipal bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 1 [Member] | Other securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 1 [Member] | Investment securities - AFS [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 1 [Member] | Interest rate swaps [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps
Interest rate swaps
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	13,393	23,966
Total assets	2,630,700	2,473,353
Interest rate swaps	13,393	23,966
Total liabilities	13,393	23,966
Level 2 [Member] | Government agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	333,013	359,300
Level 2 [Member] | Residential mortgage-backed securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	1,289,624	887,598
Level 2 [Member] | CMO/REMICs [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	389,208	571,960
Level 2 [Member] | Municipal bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	600,724	625,429
Level 2 [Member] | Other securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	4,738	5,100
Level 2 [Member] | Investment securities - AFS [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	2,617,307	2,449,387
Level 2 [Member] | Interest rate swaps [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	13,393	23,966
Interest rate swaps	13,393	23,966
Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps
Total assets
Interest rate swaps
Total liabilities
Level 3 [Member] | Government agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 3 [Member] | Residential mortgage-backed securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 3 [Member] | CMO/REMICs [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 3 [Member] | Municipal bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 3 [Member] | Other securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 3 [Member] | Investment securities - AFS [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 3 [Member] | Interest rate swaps [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps
Interest rate swaps

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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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.

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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 assets not subject to a master netting arrangement and not elected to be offset.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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-Section 03

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Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

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