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SEGMENT REPORTING - Schedule of Segments (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 06, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Income Statement [Abstract] |  |  |  |  |  |  |
Interest income |  |  | $ 86,466 |  | $ 78,206 |  |
Interest expense |  |  | (51,248) |  | (44,713) |  |
Net interest income |  |  | 35,218 |  | 33,493 |  |
Provision for loan losses |  |  | (300) |  | (3,000) |  |
Net interest income after provision for loan losses |  |  | 34,918 |  | 30,493 |  |
Operating lease income |  |  |  |  | 28,137 |  |
Operating property income |  |  | 28,921 |  |  |  |
Sale of loans, net |  |  | 7,079 |  | 4,888 |  |
Realized gain (loss) on securities |  |  | 2,865 |  | (1,099) |  |
Unrealized gain (loss) on equity securities |  |  | 2,078 |  | 0 |  |
Unrealized gain (loss) on Agency interest-only securities |  |  | 11 |  | 204 |  |
Realized gain on sale of real estate, net |  |  | 4 |  | 31,010 |  |
Impairment of real estate |  |  | (1,350) |  | 0 | $ 0 |
Fee and other income |  |  | 4,685 |  | 6,252 |  |
Net result from derivative transactions |  |  | (11,034) |  | 14,959 |  |
Earnings (loss) from investment in unconsolidated joint ventures |  |  | 959 |  | 52 |  |
Gain (loss) on extinguishment of debt |  | $ (1,100) | (1,070) |  | (69) |  |
Total other income (loss) |  |  | 33,148 |  | 84,334 |  |
Salaries and employee benefits |  |  | (23,574) |  | (17,096) |  |
Operating expenses |  |  | (5,403) |  | (5,548) |  |
Real estate operating expenses |  |  | (5,474) |  | (8,817) |  |
Fee expense |  |  | (1,712) |  | (843) |  |
Depreciation and amortization |  |  | (10,227) |  | (10,823) |  |
Total costs and expenses |  |  | (46,390) |  | (43,127) |  |
Income Tax (expense) benefit |  |  | 2,854 |  | (3,902) |  |
Net income (loss) |  |  | 24,530 |  | 67,798 |  |
Total assets |  |  | 6,525,419 | [1] | 6,272,872 | 6,272,872 | [1]
Investment in unconsolidated joint ventures | [1] |  | 93,841 |  |  | 40,354 |
Investment in FHLB stock | [1] |  | 61,619 |  |  | 57,915 |
Professional Fees |  |  | 2,500 |  | 2,900 |  |
Operating Segment |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |
Investment in unconsolidated joint ventures |  |  | 93,800 |  |  | 40,400 |
Operating Segment | Loans |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |
Interest income |  |  | 73,152 |  | 70,009 |  |
Interest expense |  |  | (14,756) |  | (13,566) |  |
Net interest income |  |  | 58,396 |  | 56,443 |  |
Provision for loan losses |  |  | (300) |  | (3,000) |  |
Net interest income after provision for loan losses |  |  | 58,096 |  | 53,443 |  |
Operating lease income |  |  |  |  | 0 |  |
Operating property income |  |  | 0 |  |  |  |
Sale of loans, net |  |  | 7,079 |  | 4,888 |  |
Realized gain (loss) on securities |  |  | 0 |  | 0 |  |
Unrealized gain (loss) on equity securities |  |  | 0 |  |  |  |
Unrealized gain (loss) on Agency interest-only securities |  |  | 0 |  | 0 |  |
Realized gain on sale of real estate, net |  |  | 0 |  | 0 |  |
Impairment of real estate |  |  | 0 |  |  |  |
Fee and other income |  |  | 3,310 |  | 3,063 |  |
Net result from derivative transactions |  |  | (5,198) |  | 6,889 |  |
Earnings (loss) from investment in unconsolidated joint ventures |  |  | 0 |  | 0 |  |
Gain (loss) on extinguishment of debt |  |  | 0 |  | (69) |  |
Total other income (loss) |  |  | 5,191 |  | 14,771 |  |
Salaries and employee benefits |  |  | 0 |  | 0 |  |
Operating expenses |  |  | 0 |  | 86 |  |
Real estate operating expenses |  |  | 0 |  | 0 |  |
Real estate acquisition costs |  |  |  |  |  |  |
Fee expense |  |  | (1,194) |  | (616) |  |
Depreciation and amortization |  |  | 0 |  | 0 |  |
Total costs and expenses |  |  | (1,194) |  | (530) |  |
Income Tax (expense) benefit |  |  | 0 |  | 0 |  |
Net income (loss) |  |  | 62,093 |  | 67,684 |  |
Total assets |  |  | 3,489,582 |  | 3,482,929 |  |
Operating Segment | Securities |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |
Interest income |  |  | 13,119 |  | 8,014 |  |
Interest expense |  |  | (2,488) |  | (856) |  |
Net interest income |  |  | 10,631 |  | 7,158 |  |
Provision for loan losses |  |  | 0 |  | 0 |  |
Net interest income after provision for loan losses |  |  | 10,631 |  | 7,158 |  |
Operating lease income |  |  |  |  | 0 |  |
Operating property income |  |  | 0 |  |  |  |
Sale of loans, net |  |  | 0 |  | 0 |  |
Realized gain (loss) on securities |  |  | 2,865 |  | (1,099) |  |
Unrealized gain (loss) on equity securities |  |  | 2,078 |  |  |  |
Unrealized gain (loss) on Agency interest-only securities |  |  | 11 |  | 204 |  |
Realized gain on sale of real estate, net |  |  | 0 |  | 0 |  |
Impairment of real estate |  |  | 0 |  |  |  |
Fee and other income |  |  | 403 |  | 0 |  |
Net result from derivative transactions |  |  | (5,836) |  | 8,070 |  |
Earnings (loss) from investment in unconsolidated joint ventures |  |  | 0 |  | 0 |  |
Gain (loss) on extinguishment of debt |  |  | 0 |  | 0 |  |
Total other income (loss) |  |  | (479) |  | 7,175 |  |
Salaries and employee benefits |  |  | 0 |  | 0 |  |
Operating expenses |  |  | 0 |  | 0 |  |
Real estate operating expenses |  |  | 0 |  | 0 |  |
Real estate acquisition costs |  |  |  |  |  |  |
Fee expense |  |  | (100) |  | (110) |  |
Depreciation and amortization |  |  | 0 |  | 0 |  |
Total costs and expenses |  |  | (100) |  | (110) |  |
Income Tax (expense) benefit |  |  | 0 |  | 0 |  |
Net income (loss) |  |  | 10,052 |  | 14,223 |  |
Total assets |  |  | 1,619,128 |  | 1,410,126 |  |
Operating Segment | Real Estate |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |
Interest income |  |  | 8 |  | 5 |  |
Interest expense |  |  | (8,882) |  | (7,854) |  |
Net interest income |  |  | (8,874) |  | (7,849) |  |
Provision for loan losses |  |  | 0 |  | 0 |  |
Net interest income after provision for loan losses |  |  | (8,874) |  | (7,849) |  |
Operating lease income |  |  |  |  | 28,137 |  |
Operating property income |  |  | 28,921 |  |  |  |
Sale of loans, net |  |  | 0 |  | 0 |  |
Realized gain (loss) on securities |  |  | 0 |  | 0 |  |
Unrealized gain (loss) on equity securities |  |  | 0 |  |  |  |
Unrealized gain (loss) on Agency interest-only securities |  |  | 0 |  | 0 |  |
Realized gain on sale of real estate, net |  |  | 4 |  | 31,010 |  |
Impairment of real estate |  |  | (1,350) |  |  |  |
Fee and other income |  |  | 7 |  | 1,782 |  |
Net result from derivative transactions |  |  | 0 |  | 0 |  |
Earnings (loss) from investment in unconsolidated joint ventures |  |  | 959 |  | 52 |  |
Gain (loss) on extinguishment of debt |  |  | (1,070) |  | 0 |  |
Total other income (loss) |  |  | 27,471 |  | 60,981 |  |
Salaries and employee benefits |  |  | 0 |  | 0 |  |
Operating expenses |  |  | 0 |  | 0 |  |
Real estate operating expenses |  |  | (5,474) |  | (8,817) |  |
Real estate acquisition costs |  |  |  |  |  |  |
Fee expense |  |  | (418) |  | (117) |  |
Depreciation and amortization |  |  | (10,202) |  | (10,804) |  |
Total costs and expenses |  |  | (16,094) |  | (19,738) |  |
Income Tax (expense) benefit |  |  | 0 |  | 0 |  |
Net income (loss) |  |  | 2,503 |  | 33,394 |  |
Total assets |  |  | 1,099,838 |  | 1,038,376 |  |
Corporate/Other |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |
Interest income |  |  | 187 |  | 178 |  |
Interest expense |  |  | (25,122) |  | (22,437) |  |
Net interest income |  |  | (24,935) |  | (22,259) |  |
Provision for loan losses |  |  | 0 |  | 0 |  |
Net interest income after provision for loan losses |  |  | (24,935) |  | (22,259) |  |
Operating lease income |  |  |  |  | 0 |  |
Operating property income |  |  | 0 |  |  |  |
Sale of loans, net |  |  | 0 |  | 0 |  |
Realized gain (loss) on securities |  |  | 0 |  | 0 |  |
Unrealized gain (loss) on equity securities |  |  | 0 |  |  |  |
Unrealized gain (loss) on Agency interest-only securities |  |  | 0 |  | 0 |  |
Realized gain on sale of real estate, net |  |  | 0 |  | 0 |  |
Impairment of real estate |  |  | 0 |  |  |  |
Fee and other income |  |  | 965 |  | 1,407 |  |
Net result from derivative transactions |  |  | 0 |  | 0 |  |
Earnings (loss) from investment in unconsolidated joint ventures |  |  | 0 |  | 0 |  |
Gain (loss) on extinguishment of debt |  |  | 0 |  | 0 |  |
Total other income (loss) |  |  | 965 |  | 1,407 |  |
Salaries and employee benefits |  |  | (23,574) |  | (17,096) |  |
Operating expenses |  |  | (5,403) |  | (5,634) |  |
Real estate operating expenses |  |  | 0 |  | 0 |  |
Real estate acquisition costs |  |  |  |  |  |  |
Fee expense |  |  | 0 |  | 0 |  |
Depreciation and amortization |  |  | (25) |  | (19) |  |
Total costs and expenses |  |  | (29,002) |  | (22,749) |  |
Income Tax (expense) benefit |  |  | 2,854 |  | (3,902) |  |
Net income (loss) |  |  | (50,118) |  | (47,503) |  |
Total assets |  |  | 316,871 |  | $ 341,441 |  |
Investment in FHLB stock |  |  | 61,600 |  |  | 57,900 |
Deferred tax liabilities |  |  | (900) |  |  | 2,300 |
Corporate/Other | Senior Unsecured Notes |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |
Senior Notes |  |  | $ 1,200,000 |  |  | $ 1,200,000 |
[1] | Includes amounts relating to consolidated variable interest entities. See Note 3.

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