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Investment Securities Available for Sale - Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 1,426,768 | $ 1,417,724
Unrealized Gains | 19,577 | 21,031
Unrealized Losses | (45,975) | (25,674)
Fair Value | 1,400,370 | 1,413,081
Available-for-sale securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities, available for sale held in securitization trusts | 48,857 | 47,922
Agency ARMs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 89,387 | 93,331
Unrealized Gains | 0 | 22
Unrealized Losses | (2,812) | (2,281)
Fair Value | 86,575 | 91,072
Agency ARMs | Freddie Mac |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 31,925 | 33,623
Unrealized Gains | 0 | 16
Unrealized Losses | (1,100) | (852)
Fair Value | 30,825 | 32,787
Agency ARMs | Fannie Mae |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 52,933 | 54,958
Unrealized Gains | 0 | 6
Unrealized Losses | (1,568) | (1,236)
Fair Value | 51,365 | 53,728
Agency ARMs | Ginnie Mae |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,529 | 4,750
Unrealized Gains | 0 | 0
Unrealized Losses | (144) | (193)
Fair Value | 4,385 | 4,557
Agency Fixed- Rate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,092,120 | 1,059,532
Unrealized Gains | 0 | 669
Unrealized Losses | (35,635) | (12,916)
Fair Value | 1,056,485 | 1,047,285
Agency Fixed- Rate | Freddie Mac |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 94,005 | 20,804
Unrealized Gains | 0 | 0
Unrealized Losses | (2,436) | (736)
Fair Value | 91,569 | 20,068
Agency Fixed- Rate | Fannie Mae |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 997,759 | 1,038,363
Unrealized Gains | 0 | 669
Unrealized Losses | (33,190) | (12,174)
Fair Value | 964,569 | 1,026,858
Agency Fixed- Rate | Ginnie Mae |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 356 | 365
Unrealized Gains | 0 | 0
Unrealized Losses | (9) | (6)
Fair Value | 347 | 359
Agency IOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 25,848 | 41,367
Unrealized Gains | 56 | 271
Unrealized Losses | (7,519) | (10,459)
Fair Value | 18,385 | 31,179
Agency IOs | Freddie Mac |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,912 | 8,436
Unrealized Gains | 0 | 19
Unrealized Losses | (2,268) | (2,756)
Fair Value | 3,644 | 5,699
Agency IOs | Fannie Mae |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,002 | 11,310
Unrealized Gains | 4 | 22
Unrealized Losses | (1,631) | (2,989)
Fair Value | 3,375 | 8,343
Agency IOs | Ginnie Mae |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 14,934 | 21,621
Unrealized Gains | 52 | 230
Unrealized Losses | (3,620) | (4,714)
Fair Value | 11,366 | 17,137
Agency RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,207,355 | 1,194,230
Unrealized Gains | 56 | 962
Unrealized Losses | (45,966) | (25,656)
Fair Value | 1,161,445 | 1,169,536
Non-Agency RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 98,053 | 100,291
Unrealized Gains | 1,168 | 1,852
Unrealized Losses | (9) | (18)
Fair Value | 99,212 | 102,125
CMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 121,360 | 123,203
Unrealized Gains | 18,353 | 18,217
Unrealized Losses | 0 | 0
Fair Value | 139,713 | 141,420
CMBS | Available-for-sale securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities, available for sale held in securitization trusts | $ 48,900 | $ 47,900

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