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Investment Securities Available for Sale - Stated Reset Periods of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 674,161 | $ 818,976
Less than 6 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 119,705 | 185,668
6 to 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 23,332 | 27,272
More than 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 531,124 | 606,036
Agency RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 415,032 | 526,363
Agency RMBS | Less than 6 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 36,940 | 53,043
Agency RMBS | 6 to 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 23,332 | 27,272
Agency RMBS | More than 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 354,760 | 446,048
Non-Agency RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 133,022 | 163,284
Non-Agency RMBS | Less than 6 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 6,205 | 50,080
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 | 126,817 | 113,204
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 2,924 | 2,887
U.S. Treasury Securities | Less than 6 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 0 | 0
U.S. Treasury Securities | 6 to 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 0 | 0
U.S. Treasury Securities | More than 24 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 2,924 | 2,887
CMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 123,183 | 126,442
CMBS | Less than 6 months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 76,560 | 82,545
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 | $ 46,623 | $ 43,897

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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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