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Debt Securities - Impairment of AFS Securities (Details) $ in Thousands | 12 Months Ended
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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 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 + Details
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- Definition 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 + Details
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- Definition 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 + Details
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