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Loans and Investments - Risk Ratings and LTV Ratios (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Loans and Investments    
Loans and investments, gross $ 11,489,393 $ 11,304,956
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) 79.00%  
Charge-offs, Year One $ 0 $ 464
Charge-offs, Year Two 3,000 0
Charge-offs, Year Three 0 4,077
Charge-offs, Year Four 1,000 7,668
Charge-offs, Year Five 0 0
Charge-offs, prior years 0 0
Charge-offs, Total 4,000 12,209
Credit risk concentration    
Loans and Investments    
Origination Year One 582,867 1,439,313
Origination Year Two 1,512,277 867,191
Origination Year Three 911,488 4,281,700
Origination Year Four 3,910,295 3,998,292
Origination Year Five 3,854,373 305,395
Origination, Prior Years 718,093 413,065
Loans and investments, gross $ 11,489,393 $ 11,304,956
Wtd. Avg. First Dollar LTV Ratio (as percent) 2.00% 2.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 79.00% 80.00%
Multifamily | Credit risk concentration    
Loans and Investments    
Origination Year One $ 429,742 $ 758,030
Origination Year Two 764,747 382,068
Origination Year Three 385,992 3,775,325
Origination Year Four 3,393,962 3,796,634
Origination Year Five 3,669,984 136,670
Origination, Prior Years 400,568 263,917
Loans and investments, gross $ 9,044,995 $ 9,112,644
Percentage of Portfolio 79.00% 81.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 2.00% 2.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 83.00% 83.00%
Multifamily | Pass | Credit risk concentration    
Loans and Investments    
Origination Year One $ 367,940 $ 308,228
Origination Year Two 134,876 41,713
Origination Year Three 52,364 69,000
Origination Year Four 113,477 10,205
Origination Year Five 55,453 2,010
Origination, Prior Years 26,814 24,823
Loans and investments, gross 750,924 455,979
Multifamily | Pass/Watch | Credit risk concentration    
Loans and Investments    
Origination Year One 61,802 357,724
Origination Year Two 472,209 308,353
Origination Year Three 297,282 1,012,593
Origination Year Four 851,639 462,709
Origination Year Five 842,472 119,860
Origination, Prior Years 200,895 113,100
Loans and investments, gross 2,726,299 2,374,339
Multifamily | Special Mention | Credit risk concentration    
Loans and Investments    
Origination Year One 0 79,618
Origination Year Two 144,363 31,344
Origination Year Three 35,688 2,340,782
Origination Year Four 2,084,634 2,958,064
Origination Year Five 2,067,639 0
Origination, Prior Years 148,294 94,529
Loans and investments, gross 4,480,618 5,504,337
Multifamily | Substandard | Credit risk concentration    
Loans and Investments    
Origination Year One 0 0
Origination Year Two 3,839 658
Origination Year Three 658 159,100
Origination Year Four 187,740 206,277
Origination Year Five 680,605 0
Origination, Prior Years 0 21,700
Loans and investments, gross 872,842 387,735
Multifamily | Doubtful | Credit risk concentration    
Loans and Investments    
Origination Year One 0 12,460
Origination Year Two 9,460 0
Origination Year Three 0 193,850
Origination Year Four 156,472 159,379
Origination Year Five 23,815 14,800
Origination, Prior Years 24,565 9,765
Loans and investments, gross 214,312 390,254
Single-Family Rental | Credit risk concentration    
Loans and Investments    
Origination Year One 153,125 674,001
Origination Year Two 741,740 485,123
Origination Year Three 525,496 506,375
Origination Year Four 516,333 201,658
Origination Year Five 184,389 129,815
Origination, Prior Years 129,810 0
Loans and investments, gross $ 2,250,893 $ 1,996,972
Percentage of Portfolio 20.00% 18.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00% 0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 61.00% 61.00%
Single-Family Rental | Pass | Credit risk concentration    
Loans and Investments    
Origination Year One $ 24,715 $ 246,234
Origination Year Two 0 32,875
Origination Year Three 0 10,683
Origination Year Four 0 0
Origination Year Five 18,976 0
Origination, Prior Years 14,601 0
Loans and investments, gross 58,292 289,792
Single-Family Rental | Pass/Watch | Credit risk concentration    
Loans and Investments    
Origination Year One 128,410 422,063
Origination Year Two 692,739 410,419
Origination Year Three 430,621 356,567
Origination Year Four 460,893 94,503
Origination Year Five 165,413 41,848
Origination, Prior Years 37,293 0
Loans and investments, gross 1,915,369 1,325,400
Single-Family Rental | Special Mention | Credit risk concentration    
Loans and Investments    
Origination Year One 0 0
Origination Year Two 49,001 31,043
Origination Year Three 94,875 139,125
Origination Year Four 55,440 107,155
Origination Year Five 0 87,967
Origination, Prior Years 77,916 0
Loans and investments, gross 277,232 365,290
Single-Family Rental | Doubtful | Credit risk concentration    
Loans and Investments    
Origination Year One   5,704
Origination Year Two   10,786
Origination Year Three   0
Origination Year Four   0
Origination Year Five   0
Origination, Prior Years   0
Loans and investments, gross   16,490
Land | Credit risk concentration    
Loans and Investments    
Origination Year One 0 7,282
Origination Year Two 5,790 0
Origination Year Three 0 0
Origination Year Four 0 0
Origination Year Five 0 3,500
Origination, Prior Years 131,428 127,928
Loans and investments, gross $ 137,218 $ 138,710
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% 96.00%
Land | Pass | Credit risk concentration    
Loans and Investments    
Origination Year One $ 0 $ 7,282
Origination Year Two 5,790 0
Origination Year Three 0 0
Origination Year Four 0 0
Origination Year Five 0 0
Origination, Prior Years 0 0
Loans and investments, gross 5,790 7,282
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 0
Origination Year Five 0 3,500
Origination, Prior Years 3,500 0
Loans and investments, gross 3,500 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 0
Origination Year Five 0 35,410
Origination, Prior Years 35,067 0
Loans and investments, gross $ 35,067 $ 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) 93.00% 94.00%
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 0
Origination Year Five 0 35,410
Origination, Prior Years 35,067 0
Loans and investments, gross 35,067 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 18,600 19,520
Loans and investments, gross 18,600 19,520
Retail | Doubtful | Credit risk concentration    
Loans and Investments    
Origination Year One 0  
Origination Year Two 0  
Origination Year Three 0  
Origination Year Four 0  
Origination Year Five 0  
Origination, Prior Years 920  
Loans and investments, gross 920  
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% 0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 100.00% 100.00%
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