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Investment Securities Available For Sale - Unrealized Losses in OCI (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Carrying Value | $ 25,507,000 | $ 573,470,000
Less than 12 Months, Gross Unrealized Losses | 124,000 | 9,864,000
Greater than 12 Months, Carrying Value | 222,390,000 | 726,186,000
Greater than 12 months, Gross Unrealized Losses | 7,467,000 | 30,262,000
Total, Carrying Value | 247,897,000 | 1,299,656,000
Total, Gross Unrealized Losses | 7,591,000 | 40,126,000
Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Carrying Value | 0 | 310,783,000
Less than 12 Months, Gross Unrealized Losses | 0 | 8,037,000
Greater than 12 Months, Carrying Value | 222,286,000 | 726,028,000
Greater than 12 months, Gross Unrealized Losses | 7,454,000 | 30,247,000
Total, Carrying Value | 222,286,000 | 1,036,811,000
Total, Gross Unrealized Losses | 7,454,000 | 38,284,000
Non-Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Carrying Value | 0 | 187,395,000
Less than 12 Months, Gross Unrealized Losses | 0 | 1,451,000
Greater than 12 Months, Carrying Value | 104,000 | 158,000
Greater than 12 months, Gross Unrealized Losses | 13,000 | 15,000
Total, Carrying Value | 104,000 | 187,553,000
Total, Gross Unrealized Losses | 13,000.0 | 1,466,000
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Carrying Value | 25,507,000 | 75,292,000
Less than 12 Months, Gross Unrealized Losses | 124,000 | 376,000
Greater than 12 Months, Carrying Value | 0 | 0
Greater than 12 months, Gross Unrealized Losses | 0 | 0
Total, Carrying Value | 25,507,000 | 75,292,000
Total, Gross Unrealized Losses | $ 124,000 | $ 376,000

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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 more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: 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=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + 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 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + 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=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + Details
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