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Schedule of Remaining Contractual Maturities of Repurchase Agreements by Type of Collateral Pledged (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 138,614	$ 121,742
Municipal securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	1,047
U.S. Agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	71,588
Mortgage-backed Agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	65,979
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	86,604
Overnight and Continuous | U.S. Agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	71,588
Overnight and Continuous | Mortgage-backed Agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	15,016
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
Greater Than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	51,808
Greater Than 90 Days | Municipal securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	1,047
Greater Than 90 Days | Mortgage-backed Agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 50,761

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(a)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(1))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-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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