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Borrowings - Summary of Short-Term Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Securities sold under repurchase agreements	$ 787,712	$ 841,741
Federal funds purchased	300,000	270,000
Subordinated notes	128,912	129,498
Short-term borrowings	$ 1,216,624	$ 1,241,239

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Amount of short-term subordinated notes with no maturity date or original maturities of less than one year.

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Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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