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Loans and Investments - Risk Ratings and LTV Ratios (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Loans and Investments    
Percentage of Portfolio 100.00% 100.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 1.00% 4.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 76.00% 77.00%
Credit risk concentration    
Loans and Investments    
Origination Year 2021 $ 8,773,039  
Origination Year 2020 1,723,054  
Origination Year 2019 1,044,533  
Origination Year 2018 288,587  
Origination Year 2017 157,115  
Origination Year Prior 172,667  
Amortized cost basis $ 12,158,995  
Wtd. Avg. First Dollar LTV Ratio (as percent) 1.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 76.00%  
Credit risk concentration | Loans and investments portfolio | New York    
Loans and Investments    
Concentration risk, percentage 19.00% 19.00%
Credit risk concentration | Loans and investments portfolio | Texas    
Loans and Investments    
Concentration risk, percentage 12.00% 11.00%
Credit risk concentration | Multifamily Portfolio    
Loans and Investments    
Origination Year 2021 $ 8,417,002  
Origination Year 2020 1,490,563  
Origination Year 2019 867,534  
Origination Year 2018 185,288  
Origination Year 2017 83,910  
Origination Year Prior 37,614  
Amortized cost basis $ 11,081,911  
Percentage of Portfolio 91.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 1.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 76.00%  
Credit risk concentration | Multifamily Portfolio | Pass    
Loans and Investments    
Origination Year 2021 $ 6,025,731  
Origination Year 2020 562,885  
Origination Year 2019 176,281  
Origination Year 2018 6,305  
Origination Year 2017 20,300  
Origination Year Prior 214  
Amortized cost basis 6,791,716  
Credit risk concentration | Multifamily Portfolio | Pass/Watch    
Loans and Investments    
Origination Year 2021 2,120,458  
Origination Year 2020 587,820  
Origination Year 2019 194,698  
Origination Year 2018 120,950  
Origination Year 2017 32,500  
Origination Year Prior 28,800  
Amortized cost basis 3,085,226  
Credit risk concentration | Multifamily Portfolio | Special Mention    
Loans and Investments    
Origination Year 2021 270,813  
Origination Year 2020 321,031  
Origination Year 2019 452,980  
Origination Year 2018 42,500  
Origination Year 2017 0  
Origination Year Prior 350  
Amortized cost basis 1,087,674  
Credit risk concentration | Multifamily Portfolio | Substandard    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 18,827  
Origination Year 2019 43,575  
Origination Year 2018 15,533  
Origination Year 2017 31,110  
Origination Year Prior 8,250  
Amortized cost basis 117,295  
Credit risk concentration | Land    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 79,118  
Origination Year 2019 19,524  
Origination Year 2018 0  
Origination Year 2017 19,975  
Origination Year Prior 127,928  
Amortized cost basis $ 246,545  
Percentage of Portfolio 2.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 96.00%  
Credit risk concentration | Land | Special Mention    
Loans and Investments    
Origination Year 2021 $ 0  
Origination Year 2020 8,100  
Origination Year 2019 0  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 8,100  
Credit risk concentration | Land | Substandard    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 71,018  
Origination Year 2019 19,524  
Origination Year 2018 0  
Origination Year 2017 19,975  
Origination Year Prior 127,928  
Amortized cost basis 238,445  
Credit risk concentration | Healthcare    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 0  
Origination Year 2019 65,819  
Origination Year 2018 41,500  
Origination Year 2017 39,650  
Origination Year Prior 0  
Amortized cost basis $ 146,969  
Percentage of Portfolio 1.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 74.00%  
Credit risk concentration | Healthcare | Pass/Watch    
Loans and Investments    
Origination Year 2021 $ 0  
Origination Year 2020 0  
Origination Year 2019 14,750  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 14,750  
Credit risk concentration | Healthcare | Special Mention    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 0  
Origination Year 2019 51,069  
Origination Year 2018 41,500  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 92,569  
Credit risk concentration | Healthcare | Substandard    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 0  
Origination Year 2019 0  
Origination Year 2018 0  
Origination Year 2017 39,650  
Amortized cost basis 39,650  
Credit risk concentration | Student Housing    
Loans and Investments    
Origination Year 2021 25,700  
Origination Year 2020 21,500  
Origination Year 2019 31,100  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis $ 78,300  
Percentage of Portfolio 1.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 21.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 73.00%  
Credit risk concentration | Student Housing | Pass    
Loans and Investments    
Origination Year 2021 $ 25,700  
Origination Year 2020 0  
Origination Year 2019 0  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 25,700  
Credit risk concentration | Student Housing | Special Mention    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 0  
Origination Year 2019 31,100  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 31,100  
Credit risk concentration | Student Housing | Substandard    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 21,500  
Origination Year 2019 0  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 21,500  
Credit risk concentration | Office    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 35,410  
Origination Year 2019 0  
Origination Year 2018 43,199  
Origination Year 2017 0  
Origination Year Prior 1,980  
Amortized cost basis $ 80,589  
Percentage of Portfolio 1.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 85.00%  
Credit risk concentration | Office | Special Mention    
Loans and Investments    
Origination Year 2021 $ 0  
Origination Year 2020 35,410  
Origination Year 2019 0  
Origination Year 2018 43,199  
Origination Year 2017 0  
Origination Year Prior 1,980  
Amortized cost basis 80,589  
Credit risk concentration | Retail    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 0  
Origination Year 2019 4,000  
Origination Year 2018 18,600  
Origination Year 2017 0  
Origination Year Prior 3,445  
Amortized cost basis $ 26,045  
Percentage of Portfolio 1.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 12.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 33.00%  
Credit risk concentration | Retail | Pass    
Loans and Investments    
Origination Year 2021 $ 0  
Origination Year 2020 0  
Origination Year 2019 4,000  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 4,000  
Credit risk concentration | Retail | Special Mention    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 0  
Origination Year 2019 0  
Origination Year 2018 18,600  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 18,600  
Credit risk concentration | Retail | Substandard    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 0  
Origination Year 2019 0  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 3,445  
Amortized cost basis 3,445  
Credit risk concentration | Single-Family Rental    
Loans and Investments    
Origination Year 2021 330,337  
Origination Year 2020 91,747  
Origination Year 2019 15,556  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis $ 437,640  
Percentage of Portfolio 4.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 65.00%  
Credit risk concentration | Single-Family Rental | Pass    
Loans and Investments    
Origination Year 2021 $ 69,992  
Origination Year 2020 18,339  
Origination Year 2019 0  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 88,331  
Credit risk concentration | Single-Family Rental | Pass/Watch    
Loans and Investments    
Origination Year 2021 257,602  
Origination Year 2020 24,927  
Origination Year 2019 0  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 282,529  
Credit risk concentration | Single-Family Rental | Special Mention    
Loans and Investments    
Origination Year 2021 2,743  
Origination Year 2020 48,481  
Origination Year 2019 15,556  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 66,780  
Credit risk concentration | Hotel Portfolio    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 4,716  
Origination Year 2019 41,000  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis $ 45,716  
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 66.00%  
Credit risk concentration | Hotel Portfolio | Pass/Watch    
Loans and Investments    
Origination Year 2021 $ 0  
Origination Year 2020 4,716  
Origination Year 2019 0  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 4,716  
Credit risk concentration | Hotel Portfolio | Special Mention    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 0  
Origination Year 2019 41,000  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 0  
Amortized cost basis 41,000  
Credit risk concentration | Other Property    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 0  
Origination Year 2019 0  
Origination Year 2018 0  
Origination Year 2017 13,580  
Origination Year Prior 1,700  
Amortized cost basis $ 15,280  
Percentage of Portfolio 1.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 7.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 51.00%  
Credit risk concentration | Other Property | Pass/Watch    
Loans and Investments    
Origination Year 2021 $ 0  
Origination Year 2020 0  
Origination Year 2019 0  
Origination Year 2018 0  
Origination Year 2017 13,580  
Origination Year Prior 0  
Amortized cost basis 13,580  
Credit risk concentration | Other Property | Doubtful    
Loans and Investments    
Origination Year 2021 0  
Origination Year 2020 0  
Origination Year 2019 0  
Origination Year 2018 0  
Origination Year 2017 0  
Origination Year Prior 1,700  
Amortized cost basis $ 1,700