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Fair Value - Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Non Recurring Basis (Detail) - Impaired Loans - Commercial Mortgages [Member] - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | $ 11 |
Discounted cash flow method | 10.00% |
Sales Comparison Approach and Discounted Cash Flow Method [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value |  | $ 2,067
Weighted Average [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Discounted cash flow method | 10.00% |
Weighted Average [Member] | Sales Comparison Approach and Discounted Cash Flow Method [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach and discounted cash flow method |  | 13.00%
Minimum [Member] | Sales Comparison Approach and Discounted Cash Flow Method [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach and discounted cash flow method |  | 10.00%
Maximum [Member] | Sales Comparison Approach and Discounted Cash Flow Method [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach and discounted cash flow method |  | 14.00%

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- Definition Fair Value Valuation Techniques Negative Adjustments For Discounted Cash Flow + References No definition available. + Details
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- Definition Fair Value Valuation Techniques Negative Adjustments For Market Conditions and Discounted Cash Flow + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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