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Disclosures about Fair Value of Assets and Liabilities - Qualitative Information about Unobservable Inputs Used in Recurring and Non-recurring Level 3 Fair Value Measurements, Other than Goodwill (Detail) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 12,044 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 12,044 |
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 7,431 | $ 6,957
Valuation Technique | Collateral based measurement |
Impaired loans | Discount to reflect current market conditions and ultimate collectability |
Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 12,044 | $ 11,602
Valuation Technique | Discounted cash flows |
Impaired loans | Discount rate, Constant prepayment rate, Probability of default |
Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability | 0.00% | 0.00%
Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Discount Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs | 10.3 | 9.6
Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs | 9.3 | 9.2
Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Default Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs | 0.1 | 0.0
Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability | 100.00% | 46.80%
Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Discount Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs | 11.3 | 10.8
Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs | 14.9 | 27.7
Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Default Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs | 0.8 | 1.5
Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability | 11.10% | 2.60%
Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Discount Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs | 10.3 | 9.7
Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs | 9.5 | 10.5
Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Default Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Unobservable inputs | 0.6 | 0.2

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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