Business, Basis of Financial Statement Presentation and Principles of Consolidation - Additional Information (Details) $ in Thousands			3 Months Ended	6 Months Ended
	Jun. 05, 2020	Mar. 27, 2020 USD ($)	Jun. 30, 2021 USD ($) Office Loan	Jun. 30, 2021 USD ($) Office Loan	Dec. 31, 2020 USD ($)
Business Basis Of Financial Statement Presentation And Principles Of Consolidation [Line Items]
Number of offices | Office			180	180
Financing receivable, loan amount			$ 166,119	$ 166,119	$ 610,134
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Business Basis Of Financial Statement Presentation And Principles Of Consolidation [Line Items]
Provision for CARES Act		$ 349,000,000
Financing Receivable, interest rate		1.00%
Financing Receivable, loan term		2 years
Financing receivable, loans outstanding | Loan			843	843
Financing receivable, loan amount			$ 166,100	$ 166,100
Financing receivable, deferred fees and costs			2,100	$ 2,100
Financing receivable, loans originated | Loan				5,727
Financing receivable, loan amount received				$ 354,500
Financing receivable loan originated deferred fees and cost			21,700	$ 21,700
Finance receivable loan deferred fees and cost recognized on sale			18,600
Finance receivable loan sold			$ 354,200
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member] | Minimum [Member]
Business Basis Of Financial Statement Presentation And Principles Of Consolidation [Line Items]
Financing Receivable, loan term	5 years
Financing Receivable, processing fee percentage	1.00%
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member] | Maximum [Member]
Business Basis Of Financial Statement Presentation And Principles Of Consolidation [Line Items]
Financing receivable, existing loans maturity term	5 years
Financing receivable, guaranteed percentage	100.00%
Financing Receivable, processing fee percentage	5.00%