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Debt Securities - Impairment of AFS Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 54,459	$ 36,795
Gross Unrealized Loss	$ (4,951)	$ (1,248)
Number of securities in cumulative unrealized loss position, more than twelve months | security	0	0
OTTI loss	$ 8,200	$ 33,000
CMBS
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	2,229
Gross Unrealized Loss	0	(530)
Other securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	8,218
Gross Unrealized Loss	0	(313)
N-Star CDO bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value	54,459	13,392
Gross Unrealized Loss	(4,951)	(219)
CMBS and other securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	12,956
Gross Unrealized Loss	$ 0	$ (186)

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- Definition

Available for Sale Securities, Number of Securities in Cumulative Unrealized Loss Position, More than Twelve Months

+ References

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562

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