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Loans and Investments - Risk Ratings and LTV Ratios (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Loans and Investments    
Loans and investments $ 13,643,724 $ 14,456,123
Percentage of Portfolio 100.00% 100.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 1.00% 1.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 76.00% 76.00%
Other Property    
Loans and Investments    
Percentage of Portfolio 1.00%  
Credit risk concentration    
Loans and Investments    
Origination Year 2023 $ 216,013  
Origination Year 2022 5,221,068  
Origination Year 2021 7,018,215  
Origination Year 2020 548,348  
Origination Year 2019 341,738  
Origination Year Prior 298,342  
Loans and investments $ 13,643,724  
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 | Texas    
Loans and Investments    
Concentration risk, percentage 24.00% 22.00%
Credit risk concentration | Loans and investments portfolio | Florida    
Loans and Investments    
Concentration risk, percentage 15.00% 14.00%
Credit risk concentration | Multifamily    
Loans and Investments    
Origination Year 2023 $ 182,825  
Origination Year 2022 4,751,170  
Origination Year 2021 6,648,973  
Origination Year 2020 357,439  
Origination Year 2019 265,704  
Origination Year Prior 102,044  
Loans and investments $ 12,308,155  
Percentage of Portfolio 91.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 1.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 77.00%  
Credit risk concentration | Multifamily | Pass    
Loans and Investments    
Origination Year 2023 $ 22,360  
Origination Year 2022 549,835  
Origination Year 2021 268,328  
Origination Year 2020 3,155  
Origination Year Prior 20,300  
Loans and investments 863,978  
Credit risk concentration | Multifamily | Pass/Watch    
Loans and Investments    
Origination Year 2023 160,465  
Origination Year 2022 2,781,244  
Origination Year 2021 3,236,800  
Origination Year 2020 303,109  
Origination Year 2019 203,354  
Origination Year Prior 22,050  
Loans and investments 6,707,022  
Credit risk concentration | Multifamily | Special Mention    
Loans and Investments    
Origination Year 2022 1,322,873  
Origination Year 2021 2,884,543  
Origination Year 2020 51,175  
Origination Year 2019 51,785  
Origination Year Prior 27,194  
Loans and investments 4,337,570  
Credit risk concentration | Multifamily | Substandard    
Loans and Investments    
Origination Year 2022 97,218  
Origination Year 2021 259,302  
Origination Year 2019 10,565  
Origination Year Prior 32,500  
Loans and investments 399,585  
Credit risk concentration | Single-Family Rental    
Loans and Investments    
Origination Year 2023 33,188  
Origination Year 2022 469,898  
Origination Year 2021 343,542  
Origination Year 2020 147,399  
Origination Year 2019 20,965  
Loans and investments $ 1,014,992  
Percentage of Portfolio 7.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 63.00%  
Credit risk concentration | Single-Family Rental | Pass    
Loans and Investments    
Origination Year 2021 $ 22,928  
Origination Year 2020 3,113  
Loans and investments 26,041  
Credit risk concentration | Single-Family Rental | Pass/Watch    
Loans and Investments    
Origination Year 2023 33,188  
Origination Year 2022 449,188  
Origination Year 2021 293,140  
Origination Year 2020 107,147  
Origination Year 2019 20,965  
Loans and investments 903,628  
Credit risk concentration | Single-Family Rental | Special Mention    
Loans and Investments    
Origination Year 2022 20,710  
Origination Year 2021 27,474  
Origination Year 2020 37,139  
Loans and investments 85,323  
Credit risk concentration | Land    
Loans and Investments    
Origination Year 2020 8,100  
Origination Year Prior 127,928  
Loans and investments $ 136,028  
Percentage of Portfolio 1.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 98.00%  
Credit risk concentration | Land | Special Mention    
Loans and Investments    
Origination Year 2020 $ 8,100  
Loans and investments 8,100  
Credit risk concentration | Land | Substandard    
Loans and Investments    
Origination Year Prior 127,928  
Loans and investments 127,928  
Credit risk concentration | Office    
Loans and Investments    
Origination Year 2020 35,410  
Origination Year Prior 44,625  
Loans and investments $ 80,035  
Percentage of Portfolio 1.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 99.00%  
Credit risk concentration | Office | Pass/Watch    
Loans and Investments    
Origination Year 2020 $ 35,410  
Loans and investments 35,410  
Credit risk concentration | Office | Substandard    
Loans and Investments    
Origination Year Prior 44,625  
Loans and investments 44,625  
Credit risk concentration | Healthcare    
Loans and Investments    
Origination Year 2019 51,069  
Loans and investments $ 51,069  
Percentage of Portfolio 1.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 69.00%  
Credit risk concentration | Healthcare | Pass/Watch    
Loans and Investments    
Origination Year 2019 $ 51,069  
Loans and investments 51,069  
Credit risk concentration | Student Housing    
Loans and Investments    
Origination Year 2021 25,700  
Loans and investments $ 25,700  
Percentage of Portfolio 1.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 67.00%  
Credit risk concentration | Student Housing | Pass    
Loans and Investments    
Origination Year 2021 $ 25,700  
Loans and investments 25,700  
Credit risk concentration | Retail    
Loans and Investments    
Origination Year 2019 4,000  
Origination Year Prior 22,045  
Loans and investments $ 26,045  
Percentage of Portfolio 1.00%  
Wtd. Avg. First Dollar LTV Ratio (as percent) 11.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 71.00%  
Credit risk concentration | Retail | Pass    
Loans and Investments    
Origination Year 2019 $ 4,000  
Loans and investments 4,000  
Credit risk concentration | Retail | Special Mention    
Loans and Investments    
Origination Year Prior 3,445  
Loans and investments 3,445  
Credit risk concentration | Retail | Substandard    
Loans and Investments    
Origination Year Prior 18,600  
Loans and investments 18,600  
Credit risk concentration | Other Property    
Loans and Investments    
Origination Year Prior 1,700  
Loans and investments $ 1,700  
Wtd. Avg. First Dollar LTV Ratio (as percent) 63.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 63.00%  
Credit risk concentration | Other Property | Doubtful    
Loans and Investments    
Origination Year Prior $ 1,700  
Loans and investments $ 1,700