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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, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value Less Than 12 Months | $ 822,431 | $ 511,313
Gross Unrealized Losses Less Than 12 Months | (21,290) | (1,807)
Carrying Value Greater Than 12 Months | 320,819 | 343,156
Gross Unrealized Losses Greater Than 12 Months | (17,165) | (13,408)
Carrying Value | 1,143,250 | 854,469
Gross Unrealized Losses | (38,455) | (15,215)
Agency RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value Less Than 12 Months | 822,431 | 511,313
Gross Unrealized Losses Less Than 12 Months | (21,290) | (1,807)
Carrying Value Greater Than 12 Months | 320,630 | 342,963
Gross Unrealized Losses Greater Than 12 Months | (17,156) | (13,390)
Carrying Value | 1,143,061 | 854,276
Gross Unrealized Losses | (38,446) | (15,197)
Non-Agency RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value Less Than 12 Months | 0 | 0
Gross Unrealized Losses Less Than 12 Months | 0 | 0
Carrying Value Greater Than 12 Months | 189 | 193
Gross Unrealized Losses Greater Than 12 Months | (9) | (18)
Carrying Value | 189 | 193
Gross Unrealized Losses | $ (9) | $ (18)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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