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Investment Securities Available for Sale - Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 1,882,843 | $ 1,534,389
Unrealized Gains | 30,505 | 17,989
Unrealized Losses | (9,330) | (40,126)
Fair Value | 1,904,018 | 1,512,252
Agency ARMs |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 60,135 | 73,949
Unrealized Gains | 17 | 8
Unrealized Losses | (1,481) | (2,563)
Fair Value | $ 58,671 | 71,394
Weighted average reset period | 27 years |
Agency ARMs | Freddie Mac |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 23,841 | 26,338
Unrealized Gains | 0 | 0
Unrealized Losses | (675) | (1,052)
Fair Value | 23,166 | 25,286
Agency ARMs | Fannie Mae |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 33,323 | 43,984
Unrealized Gains | 17 | 8
Unrealized Losses | (705) | (1,384)
Fair Value | 32,635 | 42,608
Agency ARMs | Ginnie Mae |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 2,971 | 3,627
Unrealized Gains | 0 | 0
Unrealized Losses | (101) | (127)
Fair Value | 2,870 | 3,500
Agency Fixed- Rate |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 898,806 | 1,002,057
Unrealized Gains | 4,857 | 0
Unrealized Losses | (6,496) | (35,721)
Fair Value | 897,167 | 966,336
Agency Fixed- Rate | Freddie Mac |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 79,266 | 87,018
Unrealized Gains | 997 | 0
Unrealized Losses | (433) | (2,526)
Fair Value | 79,830 | 84,492
Agency Fixed- Rate | Fannie Mae |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 819,540 | 915,039
Unrealized Gains | 3,860 | 0
Unrealized Losses | (6,063) | (33,195)
Fair Value | 817,337 | 881,844
Agency RMBS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 958,941 | 1,076,006
Unrealized Gains | 4,874 | 8
Unrealized Losses | (7,977) | (38,284)
Fair Value | 955,838 | 1,037,730
Non-Agency RMBS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 610,624 | 215,337
Unrealized Gains | 11,800 | 166
Unrealized Losses | (896) | (1,466)
Fair Value | $ 621,528 | 214,037
Weighted average reset period | 45 years |
CMBS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 264,721 | 243,046
Unrealized Gains | 13,831 | 17,815
Unrealized Losses | (154) | (376)
Fair Value | $ 278,398 | 260,485
Weighted average reset period | 1 month |
CMBS | Available-for-sale securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Investment securities, available for sale held in securitization trusts |  | 52,700
ABS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 48,557 | 0
Unrealized Gains | 0 | 0
Unrealized Losses | (303) | 0
Fair Value | $ 48,254 | $ 0

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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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