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Loans and Leases and the Allowance for Credit Losses - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) Loan	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Loan	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) Loan
Loan and lease portfolio
Net gains related to sales of residential mortgage loans	$ 2,600	$ 2,400	$ 4,700	$ 5,600
Accrued interest receivable	47,046		47,046		$ 49,303
Revolving loans, converted to term loan during the period			$ 2,900	$ 1,300
Number of days non-accrual loans are not past due			30 days
Recorded Investment	84,900		$ 84,900		72,500
Available commitments to lend additional funds on loans modified as TDR			200		500
AIR allowance	1,400		1,400		$ 2,700
Consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure	$ 1,500		$ 1,500
Consumer
Loan and lease portfolio
Number of loan and lease concessions - COVID-19 | Loan	65		65		1,920
Loan and lease modifications, amount - COVID-19	$ 13,200		$ 13,200		$ 178,100
Commercial
Loan and lease portfolio
Number of loan and lease concessions - COVID-19 | Loan	118		118		210
Loan and lease modifications, amount - COVID-19	$ 205,300		$ 205,300		$ 311,600
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
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent)			60.00%
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
Minimum
Loan and lease portfolio
Default period past due following modification of loans in TDR (in days)			60 days
PPP Loans, Administered by the SBA
Loan and lease portfolio
Loans interest rate		1.00%		1.00%
PPP Loans, Administered by the SBA | Minimum
Loan and lease portfolio
Loans maturity period				2 years
PPP Loans, Administered by the SBA | Maximum
Loan and lease portfolio
Loans maturity period				5 years
Accrued Interest Receivable
Loan and lease portfolio
Accrued interest receivable		$ 31,200		$ 31,200	$ 35,900

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