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Fair Value - Quantitative Information about Level 3 (Detail) - Commercial mortgages - Fair Value Measurement on Recurring Basis - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Impaired loans – commercial mortgages | $ 324 | $ 11
Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Impaired loans – commercial mortgages | $ 324 | $ 11
Measurement Input, Loss Severity | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input |  | 10.00%
Measurement Input, Loss Severity | Significant Unobservable Inputs (Level 3) | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 15.00% | 10.00%
Measurement Input, Loss Severity | Significant Unobservable Inputs (Level 3) | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 10.00% |
Measurement Input, Loss Severity | Significant Unobservable Inputs (Level 3) | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 15.00% |

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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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