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SEGMENT REPORTING - Schedule of Segments (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
May 01, 2019 | Feb. 06, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Income Statement [Abstract] |  |  |  |  |  |
Interest income |  |  |  | $ 72,589 | $ 86,466 |
Interest expense |  |  |  | (51,401) | (51,248) |
Net interest income (expense) |  |  |  | 21,188 | 35,218 |
Provision for loan losses |  |  |  | (26,581) | (300) |
Net interest income after provision for loan losses |  |  |  | (5,393) | 34,918 |
Operating lease income |  | $ 3,900 |  | 26,328 | 28,921 |
Sale of loans, net |  |  |  | 1,005 | 7,079 |
Realized gain (loss) on securities |  |  |  | 3,011 | 2,865 |
Unrealized gain (loss) on equity securities |  |  |  | (533) | 2,078 |
Unrealized gain (loss) on Agency interest-only securities |  |  |  | 76 | 11 |
Realized gain (loss) on sale of real estate, net |  |  |  | 10,529 | 4 |
Impairment of real estate |  |  |  | 0 | (1,350) |
Fee and other income |  |  |  | 1,519 | 4,685 |
Net result from derivative transactions |  |  |  | (15,435) | (11,034) |
Earnings (loss) from investment in unconsolidated joint ventures |  |  |  | 441 | 959 |
Gain (loss) on extinguishment/defeasance of debt |  |  | $ (1,100) | 2,061 | (1,070) |
Total other income (loss) |  |  |  | 29,002 | 33,148 |
Salaries and employee benefits |  |  |  | (17,021) | (23,574) |
Operating expenses |  |  |  | (5,794) | (5,403) |
Real estate operating expenses |  |  |  | (7,948) | (5,474) |
Fee expense |  |  |  | (1,439) | (1,712) |
Depreciation and amortization |  | $ (400) |  | (10,009) | (10,227) |
Total costs and expenses |  |  |  | (42,211) | (46,390) |
Income tax (expense) benefit |  |  |  | 4,541 | 2,854 |
Net income (loss) |  |  |  | (14,061) | 24,530 |
Total assets | [1] |  |  | 7,331,872 |  | $ 6,669,152
Investment in unconsolidated joint ventures | [1] |  |  | 48,659 |  | 48,433
Investment in FHLB stock | [1] |  |  | 61,619 |  | 61,619
Professional fees |  |  |  | 3,100 | 2,500 |
Operating Segment |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Investment in unconsolidated joint ventures |  |  |  | 48,700 |  | 48,400
Operating Segment | Loans |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Interest income |  |  |  | 58,905 | 73,152 |
Interest expense |  |  |  | (4,870) | (14,756) |
Net interest income (expense) |  |  |  | 54,035 | 58,396 |
Provision for loan losses |  |  |  | (26,581) | (300) |
Net interest income after provision for loan losses |  |  |  | 27,454 | 58,096 |
Operating lease income |  |  |  | 0 | 0 |
Sale of loans, net |  |  |  | 1,005 | 7,079 |
Realized gain (loss) on securities |  |  |  | 0 | 0 |
Unrealized gain (loss) on equity securities |  |  |  | 0 | 0 |
Unrealized gain (loss) on Agency interest-only securities |  |  |  | 0 | 0 |
Realized gain (loss) on sale of real estate, net |  |  |  | 0 | 0 |
Impairment of real estate |  |  |  | 0 | 0 |
Fee and other income |  |  |  | 1,424 | 3,310 |
Net result from derivative transactions |  |  |  | (11,351) | (5,198) |
Earnings (loss) from investment in unconsolidated joint ventures |  |  |  | 0 | 0 |
Gain (loss) on extinguishment/defeasance of debt |  |  |  | 0 | 0 |
Total other income (loss) |  |  |  | (8,922) | 5,191 |
Salaries and employee benefits |  |  |  | 0 | 0 |
Operating expenses |  |  |  | 0 | 0 |
Real estate operating expenses |  |  |  | 0 | 0 |
Fee expense |  |  |  | (1,190) | (1,194) |
Depreciation and amortization |  |  |  | 0 | 0 |
Total costs and expenses |  |  |  | (1,190) | (1,194) |
Income tax (expense) benefit |  |  |  | 0 | 0 |
Net income (loss) |  |  |  | 17,342 | 62,093 |
Total assets |  |  |  | 3,530,035 |  | 3,358,861
Operating Segment | Securities |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Interest income |  |  |  | 12,863 | 13,119 |
Interest expense |  |  |  | (6,759) | (2,488) |
Net interest income (expense) |  |  |  | 6,104 | 10,631 |
Provision for loan losses |  |  |  | 0 | 0 |
Net interest income after provision for loan losses |  |  |  | 6,104 | 10,631 |
Operating lease income |  |  |  | 0 | 0 |
Sale of loans, net |  |  |  | 0 | 0 |
Realized gain (loss) on securities |  |  |  | 3,011 | 2,865 |
Unrealized gain (loss) on equity securities |  |  |  | (533) | 2,078 |
Unrealized gain (loss) on Agency interest-only securities |  |  |  | 76 | 11 |
Realized gain (loss) on sale of real estate, net |  |  |  | 0 | 0 |
Impairment of real estate |  |  |  | 0 | 0 |
Fee and other income |  |  |  | 401 | 403 |
Net result from derivative transactions |  |  |  | (4,084) | (5,836) |
Earnings (loss) from investment in unconsolidated joint ventures |  |  |  | 0 | 0 |
Gain (loss) on extinguishment/defeasance of debt |  |  |  | 0 | 0 |
Total other income (loss) |  |  |  | (1,129) | (479) |
Salaries and employee benefits |  |  |  | 0 | 0 |
Operating expenses |  |  |  | 0 | 0 |
Real estate operating expenses |  |  |  | 0 | 0 |
Fee expense |  |  |  | (72) | (100) |
Depreciation and amortization |  |  |  | 0 | 0 |
Total costs and expenses |  |  |  | (72) | (100) |
Income tax (expense) benefit |  |  |  | 0 | 0 |
Net income (loss) |  |  |  | 4,903 | 10,052 |
Total assets |  |  |  | 1,930,605 |  | 1,721,305
Operating Segment | Real Estate |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Interest income |  |  |  | 8 | 8 |
Interest expense |  |  |  | (10,234) | (8,882) |
Net interest income (expense) |  |  |  | (10,226) | (8,874) |
Provision for loan losses |  |  |  | 0 | 0 |
Net interest income after provision for loan losses |  |  |  | (10,226) | (8,874) |
Operating lease income |  |  |  | 26,328 | 28,921 |
Sale of loans, net |  |  |  | 0 | 0 |
Realized gain (loss) on securities |  |  |  | 0 | 0 |
Unrealized gain (loss) on equity securities |  |  |  | 0 | 0 |
Unrealized gain (loss) on Agency interest-only securities |  |  |  | 0 | 0 |
Realized gain (loss) on sale of real estate, net |  |  |  | 10,529 | 4 |
Impairment of real estate |  |  |  | 0 | (1,350) |
Fee and other income |  |  |  | 25 | 7 |
Net result from derivative transactions |  |  |  | 0 | 0 |
Earnings (loss) from investment in unconsolidated joint ventures |  |  |  | 441 | 959 |
Gain (loss) on extinguishment/defeasance of debt |  |  |  | 0 | (1,070) |
Total other income (loss) |  |  |  | 37,323 | 27,471 |
Salaries and employee benefits |  |  |  | 0 | 0 |
Operating expenses |  |  |  | 0 | 0 |
Real estate operating expenses |  |  |  | (7,948) | (5,474) |
Fee expense |  |  |  | (177) | (418) |
Depreciation and amortization |  |  |  | (9,984) | (10,202) |
Total costs and expenses |  |  |  | (18,109) | (16,094) |
Income tax (expense) benefit |  |  |  | 0 | 0 |
Net income (loss) |  |  |  | 8,988 | 2,503 |
Total assets |  |  |  | 1,096,077 |  | 1,096,514
Corporate/Other |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Interest income |  |  |  | 813 | 187 |
Interest expense |  |  |  | (29,538) | (25,122) |
Net interest income (expense) |  |  |  | (28,725) | (24,935) |
Provision for loan losses |  |  |  | 0 | 0 |
Net interest income after provision for loan losses |  |  |  | (28,725) | (24,935) |
Operating lease income |  |  |  | 0 | 0 |
Sale of loans, net |  |  |  | 0 | 0 |
Realized gain (loss) on securities |  |  |  | 0 | 0 |
Unrealized gain (loss) on equity securities |  |  |  | 0 | 0 |
Unrealized gain (loss) on Agency interest-only securities |  |  |  | 0 | 0 |
Realized gain (loss) on sale of real estate, net |  |  |  | 0 | 0 |
Impairment of real estate |  |  |  | 0 | 0 |
Fee and other income |  |  |  | (331) | 965 |
Net result from derivative transactions |  |  |  | 0 | 0 |
Earnings (loss) from investment in unconsolidated joint ventures |  |  |  | 0 | 0 |
Gain (loss) on extinguishment/defeasance of debt |  |  |  | 2,061 | 0 |
Total other income (loss) |  |  |  | 1,730 | 965 |
Salaries and employee benefits |  |  |  | (17,021) | (23,574) |
Operating expenses |  |  |  | (5,794) | (5,403) |
Real estate operating expenses |  |  |  | 0 | 0 |
Fee expense |  |  |  | 0 | 0 |
Depreciation and amortization |  |  |  | (25) | (25) |
Total costs and expenses |  |  |  | (22,840) | (29,002) |
Income tax (expense) benefit |  |  |  | 4,541 | 2,854 |
Net income (loss) |  |  |  | (45,294) | $ (50,118) |
Total assets |  |  |  | 775,155 |  | 492,472
Investment in FHLB stock |  |  |  | 61,600 |  | 61,600
Deferred tax (liability) |  |  |  | (14,200) |  |
Deferred tax asset |  |  |  |  |  | (2,100)
Corporate/Other | Senior Unsecured Notes |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Senior notes |  |  |  | $ 1,900,000 |  | $ 1,200,000
[1] | Includes amounts relating to consolidated variable interest entities. See Note 1.

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