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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

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- Definition 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 + Details
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- Definition 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 + Details
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