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Summary of Significant Accounting Policies - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) Plan | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Unfunded commitments to fund low-income housing partnerships | $ 101,123,000 |  |
Variable interest entity, nonconsolidated, carrying amount, assets | 23,733,296,000 | $ 23,606,877,000 | $ 22,784,941,000
Trading securities | $ 0 | 0 |
Maximum original maturity period of cash and cash equivalents (in days) | 90 days |  |
Goodwill impairment | $ 0 |  |
Number of company's pension plans | Plan | 2 |  |
Minimum percentage of net actuarial gain (loss) will be amortized in net periodic benefit cost | 10.00% |  |
Minimum percentage of likelihood of tax position being realized upon ultimate settlement according to management's judgment | 50.00% |  |
Advertising costs | $ 8,200,000 | 10,000,000 | $ 9,600,000
Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Change in fair value of hedging instrument by the change in fair value of the hedged item. | 125.00% |  |
Maximum | Building |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives (in years) | 30 years |  |
Maximum | Equipment |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives (in years) | 10 years |  |
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Change in fair value of hedging instrument by the change in fair value of the hedged item. | 80.00% |  |
Home Equity |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Minimum maturity period to be considered to place loans and leases on non-accrual status (in days) | 120 days |  |
Home Equity | Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Combined loan-to-value ratio, considered in determining whether the entire outstanding balance on the loan is to be charged-off or not (as a percent) | 60.00% |  |
Commercial |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Minimum maturity period to be considered to place loans and leases on non-accrual status (in days) | 90 days |  |
Residential Mortgage and Home Equity Loan |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Minimum maturity period to be considered to place loans and leases on non-accrual status (in days) | 120 days |  |
Automobile and Other consumer |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Minimum maturity period to be considered for loans and leases to be charged off (in days) | 120 days |  |
Commercial and Industrial |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Minimum maturity period to be considered for loans and leases to be charged off (in days) | 120 days |  |
Other Liabilities |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Unfunded commitments to fund low-income housing partnerships | $ 101,100,000 | 88,800,000 |
Low-income Housing Partnerships |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Period over which Federal tax credits or benefits are generally recognized (in years) | 10 years |  |
Period over which State tax credits or benefits are generally recognized (in years) | 5 years |  |
Solar Energy Partnerships |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Period over which Federal tax credits or benefits are generally recognized (in years) | 6 years |  |
Variable Interest Entity Nonconsolidated |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Variable interest entity, nonconsolidated, carrying amount, assets | $ 208,900,000 | $ 175,300,000 |

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