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Securities - Overall Statistics for Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Detail) - Commercial Mortgage Backed Securities [Member]	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Coupon	5.80%	5.90%
Yield	4.60%	6.00%
Weighted Average Life	2 years 3 months 24 days	2 years 6 months

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- Definition

Available-for-sale Debt Securities, Weighted Average Discount Rate

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- Definition

Available-for-sale Debt Securities, Weighted Average Expected Term

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- Definition

Available-for-sale Debt Securities, Weighted Average Interest Rate

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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.

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