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Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Disclosure [Abstract]
Federal Home Loan Bank advances	$ 603,000	$ 375,000
Securities sold under agreements to repurchase	242,742	305,344
Total short-term borrowings	$ 845,742us-gaap_ShortTermBorrowings	$ 680,344us-gaap_ShortTermBorrowings	$ 303,045us-gaap_ShortTermBorrowings

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

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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