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Loans and Leases and the Allowance for Credit Losses - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) Loan	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Loan and lease portfolio
Net gains related to sales of residential mortgage loans	$ 7,100,000	$ 15,400,000	$ 5,300,000
Accrued interest receivable	45,242,000	49,303,000
Revolving loans, converted to term loan during the period	$ 4,100	2,900
Number of days non-accrual loans are not past due	30 days
Recorded Investment	$ 70,000,000.0	72,500,000
Available commitments to lend additional funds on loans modified as TDR	200,000	500,000
Consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure	$ 1,500,000
Consumer
Loan and lease portfolio
Number of loan and lease concessions - COVID-19 | Loan	11
Loan and lease modifications, amount - COVID-19	$ 3,100,000
Commercial
Loan and lease portfolio
Number of loan and lease concessions - COVID-19 | Loan	8
Loan and lease modifications, amount - COVID-19	$ 40,500,000
Classified
Loan and lease portfolio
Number of months up to which residential and home equity loans may be considered classified, even if they are current as to principal and interest	6 months
Classified | Consumer
Loan and lease portfolio
Number of days past due for loans and leases in classified credit quality indicator	90 days
Pass | Residential Mortgage
Loan and lease portfolio
Number of days past due for loans and leases in classified credit quality indicator	90 days
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent)	60.00%
Pass | Home Equity
Loan and lease portfolio
Number of days past due for loans and leases in classified credit quality indicator	90 days
Pass | Home Equity | First Mortgage
Loan and lease portfolio
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent)	60.00%
Pass | Home Equity | First Lien
Loan and lease portfolio
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent)	60.00%
PPP Loans, Administered by the SBA
Loan and lease portfolio
Loans interest rate	1.00%
Accrued Interest Receivable
Loan and lease portfolio
Accrued interest receivable	$ 28,700,000	$ 35,900,000
Minimum
Loan and lease portfolio
Default period past due following modification of loans in TDR (in days)	60 days
Minimum | PPP Loans, Administered by the SBA
Loan and lease portfolio
Loans maturity period	2 years
Maximum | PPP Loans, Administered by the SBA
Loan and lease portfolio
Loans maturity period	5 years

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Available commitments under revolving credit lines that have been modified as TDRs.

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Contractual interest rate for funds borrowed, under the debt agreement.

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