Mortgage Loans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans in foreclosure	$ 0.0	$ 6.4
Low
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-investment, term	1 year
Percentage of property appraisal value	40.00%
High
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-investment, term	2 years
Percentage of property appraisal value	80.00%