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Investment Securities Available for Sale - Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 674,668 | $ 829,738
Unrealized Gains | 20,476 | 16,449
Unrealized Losses | (20,983) | (27,211)
Fair Value | 674,161 | 818,976
Available-for-sale securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities, available for sale, at fair value (including $46,623 and $43,897 held in securitization trusts as of September 30, 2017 and December 31, 2016, respectively, and pledged securities of $493,632 and $690,592, as of September 30, 2017 and December 31, 2016, respectively) | 46,623 | 43,897
Agency ARMs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 99,338 | 114,180
Unrealized Gains | 34 | 95
Unrealized Losses | (1,105) | (1,430)
Fair Value | 98,267 | 112,845
Agency ARMs | Freddie Mac |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 34,733 | 39,138
Unrealized Gains | 21 | 24
Unrealized Losses | (351) | (528)
Fair Value | 34,403 | 38,634
Agency ARMs | Fannie Mae |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 59,583 | 69,031
Unrealized Gains | 13 | 71
Unrealized Losses | (545) | (698)
Fair Value | 59,051 | 68,404
Agency ARMs | Ginnie Mae |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,022 | 6,011
Unrealized Gains | 0 | 0
Unrealized Losses | (209) | (204)
Fair Value | 4,813 | 5,807
Agency Fixed Rate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 289,104 | 339,310
Unrealized Gains | 0 | 0
Unrealized Losses | (9,680) | (10,683)
Fair Value | 279,424 | 328,627
Agency Fixed Rate | Freddie Mac |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 21,556 | 26,338
Unrealized Gains | 0 | 0
Unrealized Losses | (586) | (644)
Fair Value | 20,970 | 25,694
Agency Fixed Rate | Fannie Mae |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 267,169 | 312,515
Unrealized Gains | 0 | 0
Unrealized Losses | (9,089) | (10,035)
Fair Value | 258,080 | 302,480
Agency Fixed Rate | Ginnie Mae |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 379 | 457
Unrealized Gains | 0 | 0
Unrealized Losses | (5) | (4)
Fair Value | 374 | 453
Agency IOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 47,033 | 97,153
Unrealized Gains | 486 | 2,260
Unrealized Losses | (10,178) | (14,522)
Fair Value | 37,341 | 84,891
Agency IOs | Freddie Mac |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 9,423 | 19,768
Unrealized Gains | 25 | 559
Unrealized Losses | (2,571) | (3,363)
Fair Value | 6,877 | 16,964
Agency IOs | Fannie Mae |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 13,752 | 27,597
Unrealized Gains | 50 | 478
Unrealized Losses | (3,316) | (4,777)
Fair Value | 10,486 | 23,298
Agency IOs | Ginnie Mae |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 23,858 | 49,788
Unrealized Gains | 411 | 1,223
Unrealized Losses | (4,291) | (6,382)
Fair Value | 19,978 | 44,629
Agency RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 435,475 | 550,643
Unrealized Gains | 520 | 2,355
Unrealized Losses | (20,963) | (26,635)
Fair Value | 415,032 | 526,363
Non-Agency RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 131,253 | 162,220
Unrealized Gains | 1,789 | 1,218
Unrealized Losses | (20) | (154)
Fair Value | 133,022 | 163,284
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,920 | 2,920
Unrealized Gains | 4 | 0
Unrealized Losses | 0 | (33)
Fair Value | 2,924 | 2,887
CMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 105,020 | 113,955
Unrealized Gains | 18,163 | 12,876
Unrealized Losses | 0 | (389)
Fair Value | 123,183 | 126,442
CMBS | Available-for-sale securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities, available for sale, at fair value (including $46,623 and $43,897 held in securitization trusts as of September 30, 2017 and December 31, 2016, respectively, and pledged securities of $493,632 and $690,592, as of September 30, 2017 and December 31, 2016, respectively) | $ 46,600 | $ 43,900

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