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Disclosures about Fair Value of Assets and Liabilities - Other Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans | $ 11,602 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans | 11,602 |
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans | 6,957 | $ 2,246
Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans | 11,602 | 11,174
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans | 6,957 | 2,246
Fair Value, Measurements, Nonrecurring [Member] | Mortgage Servicing Rights [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans |  | 11,174
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans | $ 6,957 | 2,246
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans |  | $ 11,174

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- Definition Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] + 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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