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Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - Level 3 [Member] - Non-Recurring Fair Value Measurements [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 4,243
Valuation Technique	Multiple data points, including discount to appraised value of collateral based on recent market activity
Unobservable Input	Appraisal comparability adjustment (discount)
Impaired Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative Range of Unobservable Inputs (Weighted-Average)	9.00%
Impaired Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative Range of Unobservable Inputs (Weighted-Average)	10.00%
Impaired Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative Range of Unobservable Inputs (Weighted-Average)	9.50%
OREO [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 6,656
Valuation Technique	Discount to appraised value of property based on recent market activity for sales of similar properties
Unobservable Input	Appraisal comparability adjustment (discount)
OREO [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative Range of Unobservable Inputs (Weighted-Average)	9.00%
OREO [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative Range of Unobservable Inputs (Weighted-Average)	10.00%
OREO [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Quantitative Range of Unobservable Inputs (Weighted-Average)	9.50%

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



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Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value.

+ References

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



-Publisher FASB



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Description of significant assumptions used by management to measure fair value.

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