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Loans and Investments - Risk Ratings and LTV Ratios (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Loans and Investments    
Loans and investments, gross $ 11,565,538 $ 12,615,006
Percentage of Portfolio 100.00% 100.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 2.00%  
Wtd. Avg. Last Dollar LTV Ratio (as percent) 80.00%  
Charge-offs, Year One $ 1,722 $ 0
Charge-offs, Year Two 0 0
Charge-offs, Year Three 2,750 0
Charge-offs, Year Four 5,488 0
Charge-offs, Year Five 0 0
Charge-offs, prior years 0 5,700
Charge-offs, Total 9,960 5,700
Credit risk concentration    
Loans and Investments    
Origination Year One 828,127 752,918
Origination Year Two 891,471 5,324,481
Origination Year Three 4,507,256 5,581,489
Origination Year Four 4,618,900 488,628
Origination Year Five 306,701 239,648
Origination, Prior Years 413,083 227,842
Loans and investments, gross $ 11,565,538 $ 12,615,006
Wtd. Avg. First Dollar LTV Ratio (as percent) 2.00% 1.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 80.00% 78.00%
Multifamily | Credit risk concentration    
Loans and Investments    
Origination Year One $ 277,081 $ 422,596
Origination Year Two 442,679 4,813,671
Origination Year Three 4,030,480 5,217,946
Origination Year Four 4,425,124 325,426
Origination Year Five 136,670 239,648
Origination, Prior Years 263,935 78,694
Loans and investments, gross $ 9,575,969 $ 11,097,981
Percentage of Portfolio 83.00% 88.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 2.00% 1.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 83.00% 80.00%
Multifamily | Pass | Credit risk concentration    
Loans and Investments    
Origination Year One $ 59,347 $ 80,814
Origination Year Two 75,239 53,316
Origination Year Three 18,600 26,185
Origination Year Four 9,346 2,010
Origination Year Five 2,010 4,598
Origination, Prior Years 24,841 20,300
Loans and investments, gross 189,383 187,223
Multifamily | Pass/Watch | Credit risk concentration    
Loans and Investments    
Origination Year One 73,598 317,358
Origination Year Two 343,325 2,561,938
Origination Year Three 1,322,118 2,223,155
Origination Year Four 862,048 119,860
Origination Year Five 119,860 84,600
Origination, Prior Years 113,100 58,044
Loans and investments, gross 2,834,049 5,364,955
Multifamily | Special Mention | Credit risk concentration    
Loans and Investments    
Origination Year One 123,276 24,424
Origination Year Two 23,457 1,762,539
Origination Year Three 2,262,487 2,631,689
Origination Year Four 3,279,171 180,750
Origination Year Five 0 140,685
Origination, Prior Years 109,385 350
Loans and investments, gross 5,797,776 4,740,437
Multifamily | Substandard | Credit risk concentration    
Loans and Investments    
Origination Year One 0 0
Origination Year Two 658 435,878
Origination Year Three 365,687 322,987
Origination Year Four 178,775 8,006
Origination Year Five 0 0
Origination, Prior Years 6,844 0
Loans and investments, gross 551,964 766,871
Multifamily | Doubtful | Credit risk concentration    
Loans and Investments    
Origination Year One 20,860 0
Origination Year Two 0 0
Origination Year Three 61,588 13,930
Origination Year Four 95,784 14,800
Origination Year Five 14,800 9,765
Origination, Prior Years 9,765 0
Loans and investments, gross 202,797 38,495
Single-Family Rental | Credit risk concentration    
Loans and Investments    
Origination Year One 540,696 330,322
Origination Year Two 448,792 510,810
Origination Year Three 476,776 363,543
Origination Year Four 193,776 119,692
Origination Year Five 126,521 0
Origination, Prior Years 0 0
Loans and investments, gross $ 1,786,561 $ 1,324,367
Percentage of Portfolio 15.00% 10.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00% 0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 61.00% 62.00%
Single-Family Rental | Pass | Credit risk concentration    
Loans and Investments    
Origination Year One $ 107,355 $ 9,709
Origination Year Two 20,834 608
Origination Year Three 7,052 0
Origination Year Four 0 0
Origination Year Five 0 0
Origination, Prior Years 0 0
Loans and investments, gross 135,241 10,317
Single-Family Rental | Pass/Watch | Credit risk concentration    
Loans and Investments    
Origination Year One 427,637 289,482
Origination Year Two 369,009 465,057
Origination Year Three 361,725 144,846
Origination Year Four 109,454 119,692
Origination Year Five 37,303 0
Origination, Prior Years 0 0
Loans and investments, gross 1,305,128 1,019,077
Single-Family Rental | Special Mention | Credit risk concentration    
Loans and Investments    
Origination Year One 5,704 31,131
Origination Year Two 58,949 45,145
Origination Year Three 107,999 218,697
Origination Year Four 84,322 0
Origination Year Five 89,218 0
Origination, Prior Years 0 0
Loans and investments, gross 346,192 294,973
Land | Credit risk concentration    
Loans and Investments    
Origination Year One 10,350 0
Origination Year Two 0 0
Origination Year Three 0 0
Origination Year Four 0 8,100
Origination Year Five 8,100 0
Origination, Prior Years 127,928 127,928
Loans and investments, gross $ 146,378 $ 136,028
Percentage of Portfolio 1.00% 1.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00% 0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 96.00% 97.00%
Land | Pass | Credit risk concentration    
Loans and Investments    
Origination Year One $ 10,350  
Origination Year Two 0  
Origination Year Three 0  
Origination Year Four 0  
Origination Year Five 0  
Origination, Prior Years 0  
Loans and investments, gross 10,350  
Land | Pass/Watch | Credit risk concentration    
Loans and Investments    
Origination Year One   $ 0
Origination Year Two   0
Origination Year Three   0
Origination Year Four   4,600
Origination Year Five   0
Origination, Prior Years   0
Loans and investments, gross   4,600
Land | Special Mention | Credit risk concentration    
Loans and Investments    
Origination Year One 0 0
Origination Year Two 0 0
Origination Year Three 0 0
Origination Year Four 0 3,500
Origination Year Five 8,100 0
Origination, Prior Years 0 0
Loans and investments, gross 8,100 3,500
Land | Substandard | Credit risk concentration    
Loans and Investments    
Origination Year One 0 0
Origination Year Two 0 0
Origination Year Three 0 0
Origination Year Four 0 0
Origination Year Five 0 0
Origination, Prior Years 127,928 127,928
Loans and investments, gross 127,928 127,928
Office | Credit risk concentration    
Loans and Investments    
Origination Year One 0 0
Origination Year Two 0 0
Origination Year Three 0 0
Origination Year Four 0 35,410
Origination Year Five 35,410 0
Origination, Prior Years 0 0
Loans and investments, gross $ 35,410 $ 35,410
Percentage of Portfolio 1.00% 1.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00% 0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 94.00% 80.00%
Office | Special Mention | Credit risk concentration    
Loans and Investments    
Origination Year One $ 0 $ 0
Origination Year Two 0 0
Origination Year Three 0 0
Origination Year Four 0 35,410
Origination Year Five 35,410 0
Origination, Prior Years 0 0
Loans and investments, gross 35,410 35,410
Retail | Credit risk concentration    
Loans and Investments    
Origination Year One 0 0
Origination Year Two 0 0
Origination Year Three 0 0
Origination Year Four 0 0
Origination Year Five 0 0
Origination, Prior Years 19,520 19,520
Loans and investments, gross $ 19,520 $ 19,520
Percentage of Portfolio 1.00% 1.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00% 0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 88.00% 88.00%
Retail | Substandard | Credit risk concentration    
Loans and Investments    
Origination Year One $ 0 $ 0
Origination Year Two 0 0
Origination Year Three 0 0
Origination Year Four 0 0
Origination Year Five 0 0
Origination, Prior Years 19,520 19,520
Loans and investments, gross 19,520 19,520
Commercial | Credit risk concentration    
Loans and Investments    
Origination Year One 0 0
Origination Year Two 0 0
Origination Year Three 0 0
Origination Year Four 0 0
Origination Year Five 0 0
Origination, Prior Years 1,700 1,700
Loans and investments, gross $ 1,700 $ 1,700
Percentage of Portfolio 1.00% 1.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00% 63.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 100.00% 66.00%
Commercial | Doubtful | Credit risk concentration    
Loans and Investments    
Origination Year One $ 0 $ 0
Origination Year Two 0 0
Origination Year Three 0 0
Origination Year Four 0 0
Origination Year Five 0 0
Origination, Prior Years 1,700 1,700
Loans and investments, gross $ 1,700 $ 1,700