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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] - Sales Comparison Valuation Technique [Member] - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 2,067	$ 2,067
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales comparison approach	11.00%	14.00%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales comparison approach	98.00%	98.00%
Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales comparison approach	34.00%	34.00%

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- Definition

Fair value valuation techniques negative adjustments for market conditions.

+ References

No definition available.

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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.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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