Concentration of Credit Risk - Schedule of Geographic Composition of Loans Held for Investment Based on Current UPB and Loan Commitment (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Concentration Risk [Line Items]
Loan commitment	$ 3,899,345	$ 3,412,016
Unfunded commitment	$ 116,428	$ 127,866
% of loan commitment	100.00%	100.00%
Total unpaid principal balance	$ 3,783,609	$ 3,284,510
% of loan UPB	100.00%	100.00%
West
Concentration Risk [Line Items]
Loan commitment	$ 1,405,299	$ 1,254,320
Unfunded commitment	$ 38,209	$ 47,318
% of loan commitment	36.00%	36.70%
Total unpaid principal balance	$ 1,367,782	$ 1,207,362
% of loan UPB	36.10%	36.80%
East
Concentration Risk [Line Items]
Loan commitment	$ 958,749	$ 965,249
Unfunded commitment	$ 10,401	$ 12,678
% of loan commitment	24.60%	28.30%
Total unpaid principal balance	$ 948,348	$ 952,571
% of loan UPB	25.10%	29.00%
South
Concentration Risk [Line Items]
Loan commitment	$ 890,697	$ 817,847
Unfunded commitment	$ 43,821	$ 49,016
% of loan commitment	22.80%	24.00%
Total unpaid principal balance	$ 846,876	$ 768,831
% of loan UPB	22.40%	23.40%
Various
Concentration Risk [Line Items]
Loan commitment	$ 509,000	$ 309,000
Unfunded commitment	$ 21,997	$ 16,800
% of loan commitment	13.10%	9.10%
Total unpaid principal balance	$ 487,003	$ 292,200
% of loan UPB	12.90%	8.90%
Midwest
Concentration Risk [Line Items]
Loan commitment	$ 135,600	$ 65,600
Unfunded commitment	$ 2,000	$ 2,054
% of loan commitment	3.50%	1.90%
Total unpaid principal balance	$ 133,600	$ 63,546
% of loan UPB	3.50%	1.90%