Loans - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) contract	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Net deferred costs		$ 22,600,000
Remaining fair value adjustment for loans acquired	$ 23,100,000	$ 30,200,000
Percentage of fair value adjustment for loans acquired	2.30%	2.90%
Accrued interest receivable	$ 14,700,000	$ 25,800,000
Loans to directors and executive officers	600,000	1,100,000
New loans offered	2
Interest income on nonaccrual loans	1,200,000	900,000	$ 1,300,000
Value of loans deferred, not classified as TDRs	$ 1,200,000	$ 74,100,000
Percentage of loans receiving accomodations	0.02%	1.00%
Allowance for credit loss on TDRs	$ 200,000	$ 200,000
Number of loans under trouble debt restructuring | contract	3	0
Value of loans under trouble debt restructuring modified in preceding twelve months	$ 200,000
Interest income related to impaired loans with impairment measured on present value of expected future cash flows	16,000	$ 100,000	$ 100,000
Portfolio Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Net deferred costs	31,000,000
Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Value of loans deferred, not classified as TDRs				$ 1,100,000,000
Percentage of loans receiving accomodations				21.00%
Paycheck Protection Program | Portfolio Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Net deferred fees	$ 2,400,000	$ 9,500,000