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Investment Securities Available for Sale - Stated Reset Periods of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 1,400,370 | $ 1,413,081
Less than 6 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 109,252 | 182,128
6 to 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 17,856 | 24,726
More than 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,273,262 | 1,206,227
Agency RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,161,445 | 1,169,536
Agency RMBS | Less than 6 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 26,019 | 26,876
Agency RMBS | 6 to 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 17,856 | 24,726
Agency RMBS | More than 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,117,570 | 1,117,934
Non-Agency RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 99,212 | 102,125
Non-Agency RMBS | Less than 6 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 14,947 | 84,461
Non-Agency RMBS | 6 to 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 0 | 0
Non-Agency RMBS | More than 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 84,265 | 17,664
CMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 139,713 | 141,420
CMBS | Less than 6 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 68,286 | 70,791
CMBS | 6 to 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 0 | 0
CMBS | More than 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 71,427 | $ 70,629

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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