Allowance for Credit Losses - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest receivable	$ 45,404		$ 45,404		$ 56,459
Deferred interest, allowance for credit loss	1,356		1,356		$ 1,500
(Recovery of) provision for loan losses	(1,200)	$ 23,100	$ (1,200)	$ 76,350
Supportable period			2 years
Real estate – construction:
Accounts, Notes, Loans and Financing Receivable [Line Items]
(Recovery of) provision for loan losses	440	1,386	$ 161	5,922
Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
(Recovery of) provision for loan losses	$ 61	$ 187	$ (77)	$ 558