Fair Value - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfers of assets and liabilities between levels of the fair value	$ 0	$ 0
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate owned, gross	43,800,000	42,600,000
Other real estate owned, valuation allowance	7,800,000	$ 7,900,000
Carrying Value \| Commercial properties
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate	32,100,000
Carrying Value \| Residential properties
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate	$ 3,800,000

Other Real Estate, Foreclosed Assets, and Repossessed Assets, Gross

No definition available.

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- Definition

Transfers of assets and liabilities between levels of the fair value.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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- Definition

Amount of the valuation allowance for real estate owned that was applied in the period against the carrying amount of real estate owned that was sold, written down or written off.

+ References

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