Concentration of Credit Risk - Schedule of Loans Held for Investment Portfolio by Property Type (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%
Multifamily
Concentration Risk [Line Items]
Loan commitment	$ 2,388,390	$ 2,291,490
Unfunded commitment	$ 60,432	$ 73,705
% of loan commitment	53.00%	53.40%
Total unpaid principal balance	$ 2,329,360	$ 2,218,827
% of loan UPB	53.70%	53.90%
Industrial
Concentration Risk [Line Items]
Loan commitment	$ 1,054,532	$ 806,714
Unfunded commitment	$ 97,708	$ 84,381
% of loan commitment	23.40%	18.80%
Total unpaid principal balance	$ 956,824	$ 722,333
% of loan UPB	22.10%	17.50%
Hotel
Concentration Risk [Line Items]
Loan commitment	$ 390,900	$ 259,100
Unfunded commitment	$ 0	$ 392
% of loan commitment	8.70%	6.00%
Total unpaid principal balance	$ 390,900	$ 258,708
% of loan UPB	9.00%	6.30%
Life Science
Concentration Risk [Line Items]
Loan commitment	$ 333,477	$ 333,477
Unfunded commitment	$ 0	$ 0
% of loan commitment	7.40%	7.80%
Total unpaid principal balance	$ 333,477	$ 333,477
% of loan UPB	7.70%	8.10%
Office
Concentration Risk [Line Items]
Loan commitment	$ 195,360	$ 454,047
Unfunded commitment	$ 14,436	$ 12,890
% of loan commitment	4.30%	10.60%
Total unpaid principal balance	$ 180,924	$ 441,157
% of loan UPB	4.20%	10.70%
Mixed-Use
Concentration Risk [Line Items]
Loan commitment	$ 78,775	$ 78,775
Unfunded commitment	$ 2,227	$ 2,227
% of loan commitment	1.70%	1.80%
Total unpaid principal balance	$ 76,548	$ 76,548
% of loan UPB	1.80%	1.90%
Self Storage
Concentration Risk [Line Items]
Loan commitment	$ 67,000	$ 67,000
Unfunded commitment	$ 0	$ 0
% of loan commitment	1.50%	1.60%
Total unpaid principal balance	$ 67,000	$ 67,000
% of loan UPB	1.50%	1.60%