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Fair Value Disclosure - Quantitative Information About Significant Unobservable Inputs (Details) - CMBS [Member] - Broker quotes [Member] - Level 3 [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
CMBS, fair value	$ 191,902
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Price	63.00%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Price	101.00%

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- Definition

Fair Value Inputs, Price

+ References

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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.

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- Definition

Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.

+ References

No definition available.

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