Financial Guarantee Liability - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2023 USD ($) loan	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) loan
Guarantor Obligations
Outstanding loan balances	$ 27,800,000		$ 27,600,000
Maximum loss potential	8,400,000		8,400,000
Provision (reversal) for expected credit losses	2,803	$ 200	1,740
Financial guarantee liability, settlment loss	1,200
Delinquent
Guarantor Obligations
Outstanding loan balances	7,300		7,300
Maximum loss potential	$ 2,400		$ 2,400
Number of loans \| loan	1		1
Liquidation value of loans outstanding	$ 7,400		$ 4,200
Potential loss on liquidation of loan	$ 500		1,100
Foreclosure
Guarantor Obligations
Outstanding loan balances			22,800
Maximum loss potential			$ 7,600
Number of loans \| loan			1
Liquidation value of loans outstanding			$ 20,000
Potential loss on liquidation of loan		$ 1,500
Fannie Mae DUS or Freddie TAH Loans \| Maximum
Guarantor Obligations
Percentage of contingent liability of actual losses incurred on outstanding loans	33.00%