Allowance for Credit Losses - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest receivable	$ 48,774,000		$ 48,774,000		$ 56,459,000
Deferred interest, allowance for credit loss	1,367,000		1,367,000		$ 1,500,000
Provision for loan losses	0	$ 26,900,000	$ 0	$ 53,250,000
Supportable period			2 years
Real estate – construction:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses	752,000	2,146,000	$ (279,000)	4,536,000
Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses	$ (49,000)	$ 219,000	$ (138,000)	$ 371,000