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Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2014 USD ($) Contract	Sep. 30, 2015 USD ($) Contract	Sep. 30, 2014 USD ($) Contract
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts | Contract	3	1	5
Pre-Modification Outstanding Recorded Investment	$ 97	$ 41	$ 245
Post-Modification Outstanding Recorded Investment	$ 97	$ 41	$ 245
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts | Contract	3		5
Pre-Modification Outstanding Recorded Investment	$ 97		$ 245
Post-Modification Outstanding Recorded Investment	$ 97		$ 245
Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts | Contract		1
Pre-Modification Outstanding Recorded Investment		$ 41
Post-Modification Outstanding Recorded Investment		$ 41

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 33



-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 33



-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 33



-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

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