Borrowed Funds - Schedule of Long-Term Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total long-term borrowings	$ 2,526,408us-gaap_LongTermDebt	$ 2,792,306us-gaap_LongTermDebt
Long-term borrowings [Member]
Debt Instrument [Line Items]
FHLB advances	1,832,166	1,982,268
Securities sold under agreements to repurchase	462,500	587,500
Subordinated debt	231,308	221,757
Other	434	781
Total long-term borrowings	$ 2,526,408	$ 2,792,306

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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