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Loans and Leases and the Allowance for Credit Losses - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) Loan | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Loan | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) Loan
Loan and lease portfolio |  |  |  |  |
Net gains related to sales of residential mortgage loans | $ 1,200 | $ 3,400 | $ 5,900 | $ 9,000 |
Accrued interest receivable | 46,751 |  | 46,751 |  | $ 49,303
Revolving loans, converted to term loan during the period |  |  | $ 2,500 | $ 1,300 |
Number of days non-accrual loans are not past due |  |  | 30 days |  |
Recorded Investment | 72,700 |  | $ 72,700 |  | 72,500
Available commitments to lend additional funds on loans modified as TDR |  |  | 200 |  | 500
AIR allowance | 700 |  | 700 |  | $ 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 | 31 |  | 31 |  | 1,920
Loan and lease modifications, amount - COVID-19 | $ 7,500 |  | $ 7,500 |  | $ 178,100
Commercial |  |  |  |  |
Loan and lease portfolio |  |  |  |  |
Number of loan and lease concessions - COVID-19 | Loan | 23 |  | 23 |  | 210
Loan and lease modifications, amount - COVID-19 | $ 130,400 |  | $ 130,400 |  | $ 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 | $ 29,900 |  | $ 29,900 |  | $ 35,900

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