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Schedule of Remaining Contractual Maturities of Repurchase Agreements by Type of Collateral Pledged (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 124,076	$ 121,742
U.S. Agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	57,535
Mortgage-backed Agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	65,995
Municipal securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	546
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	72,577
Overnight and Continuous | U.S. Agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	57,535
Overnight and Continuous | Mortgage-backed Agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	15,042
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	202
Up to 30 Days | Mortgage-backed Agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	202
30-90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	170
30-90 Days | Mortgage-backed Agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	170
Greater Than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	51,127
Greater Than 90 Days | Mortgage-backed Agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	50,581
Greater Than 90 Days | Municipal securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 546

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



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-Publisher FASB



-Name Accounting Standards Codification



-Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing



-URI http://asc.fasb.org/extlink&oid=49203159

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