Loans Held for Investment, Net - Schedule of Loans Held for Investment as a Percentage of Face Amount by Geographic Areas Face Amounts (Details)	Mar. 31, 2026	Dec. 31, 2025
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	1	1
Life Science
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.3386	0.2807
Multifamily
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.295	0.3094
Single Family Rental
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.2548	0.2792
Self-Storage
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.0492	0.0449
Marina
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.0268	0.0491
Industrial
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	356	367
Massachusetts
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.2197	0.1757
Texas
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.1485	0.1522
Georgia
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.0852	0.1041
Maryland
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.0754	0.0775
California
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.0586	0.0588
Virginia
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.0564	0.0567
Florida
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.084	0.0819
Other
Financing Receivable, Nonaccrual [Line Items]
% of loan portfolio	0.2722	0.2931