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SUBSEQUENT EVENTS (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | May 01, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | [2]
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Subsequent Event [Line Items] |  |  |  |  |
Residential mortgages loans | [1] |  |  | $ 3,879,324 | $ 4,585,975
Preferred stock, redemption price (in dollars per share) |  |  |  | $ 25.00 |
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Preferred stock, redemption price (in dollars per share) |  | $ 25.00 |  |  |
OBX 2019-EXP1 | Consolidated VIEs | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Residential mortgages loans |  |  | $ 388,200 |  |
Series H Preferred Stock | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Preferred stock to be redeemed (in shares) |  | 2.2 |  |  |
[1] | (4) Includes $101.3 million and $97.5 million of residential mortgage loans held for sale, $42.0 million and $42.2 million of commercial mortgage loans held for sale and $44.5 million and $0 of corporate loans held for sale at March 31, 2019 and December 31, 2018, respectively.
[2] | (1) Derived from the audited consolidated financial statements at December 31, 2018.

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