General and Administrative Expenses, Loan Acquisition Costs, and Other Expenses - Components of General and Administrative Expenses and Other Expenses (Details) - USD ($) $ in Thousands		3 Months Ended
	Oct. 15, 2019	Mar. 31, 2022	Mar. 31, 2021
Business Acquisition [Line Items]
Fixed compensation expense		$ 14,628	$ 11,805
Annual variable compensation expense		3,357	18,669
Long-term incentive award expense		5,660	4,169
Acquisition-related equity compensation expense		0	1,212
Systems and consulting		3,184	2,977
Office costs		2,025	1,808
Accounting and legal		1,675	714
Corporate costs		864	691
Other		3,461	1,506
Total General and Administrative Expenses		34,854	43,551
Commissions		2,614	1,263
Underwriting costs		1,372	1,685
Transfer and holding costs		479	611
Total Loan Acquisition Costs		4,465	3,559
Amortization of purchase-related intangible assets		3,534	3,873
Other		551	223
Total Other Expenses		4,085	4,096
Total General and Administrative Expenses, Loan Acquisition Costs, and Other Expenses		43,404	51,206
Settlement in Common Stock
Business Acquisition [Line Items]
Long-term incentive award expense		5,000	3,000
Settlement in Cash
Business Acquisition [Line Items]
Long-term incentive award expense		1,000	$ 1,000
Cash Based Retention Award
Business Acquisition [Line Items]
Cash-based retention awards granted		$ 2,000
Variable compensation expense, term		3 years
CAFL
Business Acquisition [Line Items]
Restricted stock awards (in shares)	588,260
Restricted stock awards	$ 10,000
Contingent consideration performance term	2 years