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Securities - Overall Statistics for Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Details) - Commercial Mortgage Backed Securities [Member] - BB to D Credit Rating [Member]	12 Months Ended
	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Coupon	5.90%
Yield	6.00%
Weighted Average Life	2 years 6 months

X

- Definition

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

+ References

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+ Details

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X

- Definition

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

+ References

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+ Details

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X

- Definition

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

+ References

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+ Details

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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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- Details

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X

- Details

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