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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, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value Less Than 12 Months | $ 91,170 | $ 112,880
Gross Unrealized Losses Less Than 12 Months | (914) | (1,679)
Carrying Value Greater Than 12 Months | 281,364 | 329,070
Gross Unrealized Losses Greater Than 12 Months | (9,886) | (10,973)
Carrying Value | 372,534 | 441,950
Gross Unrealized Losses | (10,800) | (12,652)
Agency RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value Less Than 12 Months | 91,170 | 96,357
Gross Unrealized Losses Less Than 12 Months | (914) | (1,290)
Carrying Value Greater Than 12 Months | 281,152 | 328,474
Gross Unrealized Losses Greater Than 12 Months | (9,866) | (10,819)
Carrying Value | 372,322 | 424,831
Gross Unrealized Losses | (10,780) | (12,109)
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 | 212 | 596
Gross Unrealized Losses Greater Than 12 Months | (20) | (154)
Carrying Value | 212 | 596
Gross Unrealized Losses | $ (20) | (154)
CMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value Less Than 12 Months |  | 16,523
Gross Unrealized Losses Less Than 12 Months |  | (389)
Carrying Value Greater Than 12 Months |  | 0
Gross Unrealized Losses Greater Than 12 Months |  | 0
Carrying Value |  | 16,523
Gross Unrealized Losses |  | $ (389)

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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 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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