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Fair Value - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value Measurement on Recurring Basis - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Commercial mortgages |  |
Impaired loans: |  |
Impaired loans – commercial mortgages | $ 321 | $ 11
Commercial mortgages | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Impaired loans: |  |
Impaired loans – commercial mortgages | 0 | 0
Commercial mortgages | Significant Other Observable Inputs (Level 2) |  |
Impaired loans: |  |
Impaired loans – commercial mortgages | 0 | 0
Commercial mortgages | Significant Unobservable Inputs (Level 3) |  |
Impaired loans: |  |
Impaired loans – commercial mortgages | 321 | $ 11
Commercial, Industrial, and Agricultural |  |
Impaired loans: |  |
Impaired loans – commercial mortgages | 3,004 |
Commercial, Industrial, and Agricultural | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Impaired loans: |  |
Impaired loans – commercial mortgages | 0 |
Commercial, Industrial, and Agricultural | Significant Other Observable Inputs (Level 2) |  |
Impaired loans: |  |
Impaired loans – commercial mortgages | 0 |
Commercial, Industrial, and Agricultural | Significant Unobservable Inputs (Level 3) |  |
Impaired loans: |  |
Impaired loans – commercial mortgages | $ 3,004 |

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- Definition Impaired loans. + 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://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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