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Investment Securities Available for Sale - Schedule of Investment Securities Available for Sale in Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Carrying Value Less Than 12 Months | $ 51,269 | $ 573,470
Gross Unrealized Losses Less Than 12 Months | (401) | (9,864)
Carrying Value Greater Than 12 Months | 1,004,414 | 726,186
Gross Unrealized Losses Greater Than 12 Months | (21,773) | (30,262)
Carrying Value | 1,055,683 | 1,299,656
Gross Unrealized Losses | (22,174) | (40,126)
Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
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 | 1,004,264 | 726,028
Gross Unrealized Losses Greater Than 12 Months | (21,759) | (30,247)
Carrying Value | 1,004,264 | 1,036,811
Gross Unrealized Losses | (21,759) | (38,284)
Non-Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Carrying Value Less Than 12 Months | 51,269 | 187,395
Gross Unrealized Losses Less Than 12 Months | (401) | (1,451)
Carrying Value Greater Than 12 Months | 150 | 158
Gross Unrealized Losses Greater Than 12 Months | (14) | (15)
Carrying Value | 51,419 | 187,553
Gross Unrealized Losses | $ (415) | (1,466)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Carrying Value Less Than 12 Months |  | 75,292
Gross Unrealized Losses Less Than 12 Months |  | (376)
Carrying Value Greater Than 12 Months |  | 0
Gross Unrealized Losses Greater Than 12 Months |  | 0
Carrying Value |  | 75,292
Gross Unrealized Losses |  | $ (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. + 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 12 months or longer. + 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 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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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