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Short-Term Borrowings - Schedule of Short-Term Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Debt Disclosure [Abstract]
Securities sold under agreements with customers to repurchase	$ 366,140	$ 357,400	$ 301,628
Federal funds purchased	19,775us-gaap_FederalFundsPurchased	8,700us-gaap_FederalFundsPurchased	5,500us-gaap_FederalFundsPurchased
Advances from Federal Home Loan Bank of Dallas	15,983	1,010	76,092
Total	$ 401,898us-gaap_ShortTermBorrowings	$ 367,110us-gaap_ShortTermBorrowings	$ 383,220us-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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