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, 2026	Dec. 31, 2025
Concentration Risk [Line Items]
Loan commitment	$ 4,508,434	$ 4,290,603
Unfunded commitment	$ 174,803	$ 173,595
% of loan commitment	100.00%	100.00%
Total unpaid principal balance	$ 4,335,033	$ 4,118,050
% of loan UPB	100.00%	100.00%
West
Concentration Risk [Line Items]
Loan commitment	$ 1,538,282	$ 1,546,038
Unfunded commitment	$ 63,789	$ 58,655
% of loan commitment	34.10%	36.10%
Total unpaid principal balance	$ 1,475,895	$ 1,488,425
% of loan UPB	34.00%	36.10%
South
Concentration Risk [Line Items]
Loan commitment	$ 1,009,580	$ 860,581
Unfunded commitment	$ 34,208	$ 36,612
% of loan commitment	22.40%	20.00%
Total unpaid principal balance	$ 975,372	$ 823,969
% of loan UPB	22.50%	20.10%
East
Concentration Risk [Line Items]
Loan commitment	$ 971,577	$ 1,075,384
Unfunded commitment	$ 36,780	$ 49,037
% of loan commitment	21.60%	25.10%
Total unpaid principal balance	$ 934,797	$ 1,026,347
% of loan UPB	21.60%	24.90%
Various
Concentration Risk [Line Items]
Loan commitment	$ 753,395	$ 573,000
Unfunded commitment	$ 36,740	$ 23,512
% of loan commitment	16.70%	13.30%
Total unpaid principal balance	$ 716,655	$ 549,488
% of loan UPB	16.50%	13.30%
Midwest
Concentration Risk [Line Items]
Loan commitment	$ 235,600	$ 235,600
Unfunded commitment	$ 3,286	$ 5,779
% of loan commitment	5.20%	5.50%
Total unpaid principal balance	$ 232,314	$ 229,821
% of loan UPB	5.40%	5.60%