Loans Held for Investment - By Region (Details)	Dec. 31, 2022	Dec. 31, 2021
Loans held for investment by Region [Line Items]
Percentage of loans concentrated in major states	43.10%	38.40%
California
Loans held for investment by Region [Line Items]
Percentage of loans held in state	9.80%	9.60%
New York
Loans held for investment by Region [Line Items]
Percentage of loans held in state	9.10%	9.40%
Pennsylvania
Loans held for investment by Region [Line Items]
Percentage of loans held in state	7.40%	7.80%
Texas
Loans held for investment by Region [Line Items]
Percentage of loans held in state	6.00%	5.60%
New Jersey
Loans held for investment by Region [Line Items]
Percentage of loans held in state	5.80%	6.00%
Florida
Loans held for investment by Region [Line Items]
Percentage of loans held in state	5.00%	0.00%