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Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Impaired Loans [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Estimate | $ 1,040 | $ 952
Fair Value Measurements, Valuation Technique | Appraisal of collateral | Appraisal of collateral
Impaired Loans [Member] | Minimum [Member] | Appraisal of Collateral [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments | 0.00% | 10.00%
Fair Value Assumptions, Liquidation expense | 0.00% | 0.00%
Fair Value Assumptions, Holding period | 0 months | 0 months
Impaired Loans [Member] | Maximum [Member] | Appraisal of Collateral [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments | 30.00% | 67.00%
Fair Value Assumptions, Liquidation expense | 10.00% | 10.00%
Fair Value Assumptions, Holding period | 30 months | 30 months
Impaired Loans [Member] | Weighted Average [Member] | Appraisal of Collateral [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments | 16.00% | 64.00%
Fair Value Assumptions, Liquidation expense | 8.00% | 4.00%
Fair Value Assumptions, Holding period | 20 months | 19 months
Other Real Estate Owned [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Estimate | $ 16 | $ 37
Fair Value Measurements, Valuation Technique | Appraisal of collateral | Appraisal of collateral
Other Real Estate Owned [Member] | Minimum [Member] | Appraisal of Collateral [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments | 10.00% | 10.00%
Fair Value Assumptions, Liquidation expense | 0.00% | 0.00%
Other Real Estate Owned [Member] | Maximum [Member] | Appraisal of Collateral [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments | 30.00% | 30.00%
Fair Value Assumptions, Liquidation expense | 10.00% | 10.00%
Other Real Estate Owned [Member] | Weighted Average [Member] | Appraisal of Collateral [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments | 10.00% | 10.00%
Fair Value Assumptions, Liquidation expense | 10.00% | 10.00%

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- Definition Percentage of adjustment to the observed price for a similar asset, used as an input to measure fair value. + References No definition available. + Details
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- Definition Fair value inputs holding period. + References No definition available. + Details
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- Definition Percentage of adjustment to the observed price to dispose of asset, used as an input to measure fair value. + References No definition available. + Details
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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 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + 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 Description of the inputs and valuation technique(s) used to measure fair value. + 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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