Summary of Significant Accounting Policies - Narrative (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle
Guaranty liabilities		$ (27,729,000)	$ (25,989,000)	$ (29,581,000)
Provision (reversal) for expected credit losses	$ (3,592,000)	1,740,000	(3,600,000)	11,600,000
Allowance for doubtful accounts		20,900,000	16,700,000
Total stockholders’ equity		1,181,337,000	1,277,927,000
Allowance for credit loss		1,400,000
Revenues from contracts with customers		2,304,500,000	2,499,008,000	1,435,401,000
Impairment of intangible assets		$ 0	0	0
Number of operating segments | segment		1
Mortgage brokerage and debt placement
New Accounting Pronouncements or Change in Accounting Principle
Revenues from contracts with customers		$ 173,253,000	180,561,000	50,135,000
Servicing Fees
New Accounting Pronouncements or Change in Accounting Principle
Mortgage service rights, interest rate		300.00%
Surveillance Fees
New Accounting Pronouncements or Change in Accounting Principle
Mortgage service rights, interest rate		100.00%
Loans Receivable
New Accounting Pronouncements or Change in Accounting Principle
Allowance for credit loss			$ 3,800,000
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle
Guaranty liabilities					$ (17,900,000)
Cumulative Effect, Period of Adoption, Adjustment | Accounts Receivable
New Accounting Pronouncements or Change in Accounting Principle
Allowance for doubtful accounts, period increase				$ 4,200,000
Cumulative Effect, Period of Adoption, Adjustment | Loans Receivable
New Accounting Pronouncements or Change in Accounting Principle
Total stockholders’ equity						$ 3,700,000