Financial Guarantee Liability - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($)
Guarantor Obligations
Outstanding loan balances	$ 29,100,000	$ 27,600,000
Maximum loss potential	9,000,000	8,400,000
Provision (reversal) for expected credit losses	2,634	1,740	$ (3,600)
Financial guarantee liability, settlment loss		1,200
Financial guarantee liability, settlement loss, write off		600
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	$ 7,500	$ 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%