Fair Value Measurements and Disclosures - Schedule of Significant Observable Inputs Used in Fair Value Measurement of Level 3 Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Repossessed assets	$ 454	$ 2,893
Impaired loans	4,682	4,763
Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Repossessed assets	454	2,893
Impaired loans	$ 4,682	$ 4,763
Level 3 [Member] \| Repossessed assets [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique	Third party appraisals, sales contracts, broker price opinions
Unobservable Inputs	Collateral discounts and estimated costs to sell
Level 3 [Member] \| Repossessed assets [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted Average/ Range of Discounts	6.00%	6.00%
Level 3 [Member] \| Repossessed assets [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted Average/ Range of Discounts	100.00%	96.00%
Level 3 [Member] \| Repossessed assets [Member] \| Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted Average/ Range of Discounts	41.00%	19.00%
Level 3 [Member] \| Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique	Third party appraisals and discounted cash flows
Unobservable Inputs	Collateral discounts and discount rates
Level 3 [Member] \| Impaired Loans [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted Average/ Range of Discounts	0.00%	0.00%
Level 3 [Member] \| Impaired Loans [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted Average/ Range of Discounts	100.00%	100.00%
Level 3 [Member] \| Impaired Loans [Member] \| Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted Average/ Range of Discounts	20.00%	15.00%
Level 3 [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Repossessed assets	$ 454	$ 2,893
Impaired loans	$ 4,682	$ 4,763

Impaired loans fair value disclosure nonrecurring.

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Repossessed assets fair value disclosure nonrecurring.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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Description of the inputs and valuation technique(s) used to measure fair value.

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