Loans Held for Investment - By Region (Details)	Dec. 31, 2024	Dec. 31, 2023
Loans held for investment by Region [Line Items]
Percentage of loans concentrated in major states	43.80%	43.50%
California
Loans held for investment by Region [Line Items]
Percentage of loans held in state	10.20%	10.10%
New York
Loans held for investment by Region [Line Items]
Percentage of loans held in state	9.00%	9.00%
Pennsylvania
Loans held for investment by Region [Line Items]
Percentage of loans held in state	7.10%	7.20%
Texas
Loans held for investment by Region [Line Items]
Percentage of loans held in state	6.60%	6.30%
New Jersey
Loans held for investment by Region [Line Items]
Percentage of loans held in state	5.60%	5.60%
Florida
Loans held for investment by Region [Line Items]
Percentage of loans held in state	5.30%	5.30%