Loans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost in troubled debt restructurings	$ 15,088,000	$ 10,951,000
Accrued interest receivable and other assets	37,382,000	24,913,000
Allowance for credit losses, period increase (decrease)	$ 5,000,000.0	0
Minimum period to be considered for loan to have defaulted	90 days
Principal balances forgiven in connection with loan restructuring	$ 0	$ 0
Trouble Debt Restructuring
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, period increase (decrease)	$ 0		$ 351,000