Loans Held for Investment - By Region (Details)	Dec. 31, 2023	Dec. 31, 2022
Loans held for investment by Region [Line Items]
Percentage of loans concentrated in major states	43.50%	43.10%
California
Loans held for investment by Region [Line Items]
Percentage of loans held in state	10.10%	9.80%
New York
Loans held for investment by Region [Line Items]
Percentage of loans held in state	9.00%	9.10%
Pennsylvania
Loans held for investment by Region [Line Items]
Percentage of loans held in state	7.20%	7.40%
Texas
Loans held for investment by Region [Line Items]
Percentage of loans held in state	6.30%	5.80%
New Jersey
Loans held for investment by Region [Line Items]
Percentage of loans held in state	5.60%	6.00%
Florida
Loans held for investment by Region [Line Items]
Percentage of loans held in state	5.30%	5.00%