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Loans and Investments - Schedule of Risk Ratings and LTV Ratios (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Loans and Investments    
Loans and investments, gross $ 11,997,293 $ 12,113,107
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) 77.00%  
Charge-offs, Year One $ 0 $ 0
Charge-offs, Year Two 0 3,000
Charge-offs, Year Three 3,829 0
Charge-offs, Year Four 0 24,476
Charge-offs, Year Five 11,322 31,968
Charge-offs, prior years 3,057 68,893
Charge-offs, Total 18,208 128,337
Credit risk concentration    
Loans and Investments    
Origination Year One 552,010 2,963,166
Origination Year Two 3,032,970 1,766,551
Origination Year Three 1,511,832 908,608
Origination Year Four 768,357 3,127,360
Origination Year Five 2,971,887 2,998,638
Origination, Prior Years 3,160,237 348,784
Loans and investments, gross $ 11,997,293 $ 12,113,107
Wtd. Avg. First Dollar LTV Ratio (as percent) 2.00% 2.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 77.00% 77.00%
Multifamily | Credit risk concentration    
Loans and Investments    
Origination Year One $ 476,100 $ 1,968,607
Origination Year Two 2,014,049 760,535
Origination Year Three 560,125 336,717
Origination Year Four 171,717 2,625,648
Origination Year Five 2,459,944 2,926,722
Origination, Prior Years 2,992,416 255,612
Loans and investments, gross $ 8,674,351 $ 8,873,841
Percentage of Portfolio 72.00% 73.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 3.00% 3.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 82.00% 81.00%
Multifamily | Pass | Credit risk concentration    
Loans and Investments    
Origination Year One $ 430,100 $ 556,801
Origination Year Two 600,924 87,533
Origination Year Three 47,468 22,253
Origination Year Four 38,673 9,832
Origination Year Five 79,883 34,843
Origination, Prior Years 174,014 26,758
Loans and investments, gross 1,371,062 738,020
Multifamily | Pass/Watch | Credit risk concentration    
Loans and Investments    
Origination Year One 46,000 1,195,412
Origination Year Two 999,872 429,300
Origination Year Three 273,570 108,276
Origination Year Four 86,290 376,064
Origination Year Five 344,490 526,961
Origination, Prior Years 736,622 159,810
Loans and investments, gross 2,486,844 2,795,823
Multifamily | Special Mention | Credit risk concentration    
Loans and Investments    
Origination Year One 0 211,404
Origination Year Two 408,273 186,984
Origination Year Three 206,869 185,088
Origination Year Four 25,654 1,788,580
Origination Year Five 1,547,788 2,028,742
Origination, Prior Years 1,755,859 44,479
Loans and investments, gross 3,944,443 4,445,277
Multifamily | Substandard | Credit risk concentration    
Loans and Investments    
Origination Year One 0 4,990
Origination Year Two 4,980 47,258
Origination Year Three 22,758 21,100
Origination Year Four 0 297,729
Origination Year Five 282,250 307,350
Origination, Prior Years 168,820 0
Loans and investments, gross 478,808 678,427
Multifamily | Doubtful | Credit risk concentration    
Loans and Investments    
Origination Year One 0 0
Origination Year Two 0 9,460
Origination Year Three 9,460 0
Origination Year Four 21,100 153,443
Origination Year Five 205,533 28,826
Origination, Prior Years 157,101 24,565
Loans and investments, gross 393,194 216,294
Single-Family Rental | Credit risk concentration    
Loans and Investments    
Origination Year One 75,910 994,559
Origination Year Two 1,018,921 1,006,016
Origination Year Three 951,707 571,891
Origination Year Four 596,640 501,712
Origination Year Five 511,943 71,916
Origination, Prior Years 112,971 38,816
Loans and investments, gross $ 3,268,092 $ 3,184,910
Percentage of Portfolio 27.00% 26.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) 0.00% 0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) 64.00% 64.00%
Single-Family Rental | Pass | Credit risk concentration    
Loans and Investments    
Origination Year One $ 0 $ 98,510
Origination Year Two 27,000 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 27,000 98,510
Single-Family Rental | Pass/Watch | Credit risk concentration    
Loans and Investments    
Origination Year One 36,400 859,819
Origination Year Two 878,166 1,006,016
Origination Year Three 934,628 571,891
Origination Year Four 550,457 448,769
Origination Year Five 486,043 71,916
Origination, Prior Years 106,080 34,216
Loans and investments, gross 2,991,774 2,992,627
Single-Family Rental | Special Mention | Credit risk concentration    
Loans and Investments    
Origination Year One 39,510 36,230
Origination Year Two 113,755 0
Origination Year Three 17,079 0
Origination Year Four 46,183 52,943
Origination Year Five 25,900 0
Origination, Prior Years 6,891 4,600
Loans and investments, gross 249,318 93,773
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 16,955 16,955
Loans and investments, gross $ 16,955 $ 16,955
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% 97.00%
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 16,424 16,424
Loans and investments, gross 16,424 16,424
Retail | 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 531 531
Loans and investments, gross 531 531
Land | 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 2,785 2,291
Loans and investments, gross $ 2,785 $ 2,291
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) 14.00% 77.00%
Land | Pass/Watch | 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 2,785 2,291
Loans and investments, gross 2,785 2,291
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 0
Origination, Prior Years 33,410 33,410
Loans and investments, gross $ 33,410 $ 33,410
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) 88.00% 88.00%
Office | Pass/Watch | 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 33,410 33,410
Loans and investments, gross 33,410 33,410
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