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Investment Securities Available for Sale - Schedule of Investment Securities Available for Sale in Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Carrying Value Less Than 12 Months | $ 46,741 | $ 573,470
Gross Unrealized Losses Less Than 12 Months | (332) | (9,864)
Carrying Value Greater Than 12 Months | 291,919 | 726,186
Gross Unrealized Losses Greater Than 12 Months | (7,991) | (30,262)
Carrying Value | 338,660 | 1,299,656
Gross Unrealized Losses | (8,323) | (40,126)
Agency RMBS |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Carrying Value Less Than 12 Months | 0 | 310,783
Gross Unrealized Losses Less Than 12 Months | 0 | (8,037)
Carrying Value Greater Than 12 Months | 291,801 | 726,028
Gross Unrealized Losses Greater Than 12 Months | (7,977) | (30,247)
Carrying Value | 291,801 | 1,036,811
Gross Unrealized Losses | (7,977) | (38,284)
Non-Agency RMBS |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Carrying Value Less Than 12 Months | 15,430 | 187,395
Gross Unrealized Losses Less Than 12 Months | (178) | (1,451)
Carrying Value Greater Than 12 Months | 118 | 158
Gross Unrealized Losses Greater Than 12 Months | (14) | (15)
Carrying Value | 15,548 | 187,553
Gross Unrealized Losses | (192) | (1,466)
CMBS |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Carrying Value Less Than 12 Months | 31,311 | 75,292
Gross Unrealized Losses Less Than 12 Months | (154) | (376)
Carrying Value Greater Than 12 Months | 0 | 0
Gross Unrealized Losses Greater Than 12 Months | 0 | 0
Carrying Value | 31,311 | 75,292
Gross Unrealized Losses | $ (154) | $ (376)

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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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