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Summary of Significant Accounting Policies - Additional Information (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 15, 2021 USD ($) $ / shares shares | Jan. 01, 2020 USD ($) | Dec. 31, 2021 USD ($) segment plan $ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Unfunded commitments to fund low-income housing partnerships |  |  | $ 43,965,000 |  |
Variable interest entity, nonconsolidated, carrying amount, assets |  |  | 22,784,941,000 | $ 20,603,651,000 | $ 18,095,496,000
Trading securities |  |  | $ 0 | 0 |
Number of portfolio segments of loans and leases (commercial and consumer) | segment |  |  | 2 |  |
Period during which non-accrual loan that has been modified in a troubled debt restructuring remains on non-accrual status (in months) |  |  | 6 months |  |
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% |  |
Preferred Stock, par value (in dollars per share) | $ / shares |  |  | $ 0.01 |  |
Net proceeds, after underwriting discounts and expenses |  |  | $ 175,487,000 |  |
Advertising costs |  |  | $ 9,600,000 | 8,300,000 | 6,100,000
Accounting Standards Update 2016-13 |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Total reserve for credit losses |  |  |  |  | $ 116,849,000
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  | Jan. 01, 2020 |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  | true |  |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Total reserve for credit losses |  | $ (5,072,000) |  |  |
Increase to retained earnings |  | $ 3,632,000 |  |  |
ASU No. 2019-12 |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  | Dec. 15, 2020 |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  | true |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] |  |  | true |  |
Depositary Shares |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Shares issued and sold | shares | 7,200,000 |  |  |  |
Preferred stock, redemption price per share | $ / shares | $ 25 |  |  |  |
4.375% Fixed Rate Non-Cumulative Perpetual Preferred Stock |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of ownership interest in share | 0.025% |  |  |  |
Series A Preferred Stock |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Preferred stock, dividend rate, percentage per annum | 4.375% |  |  |  |
Preferred Stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |
Preferred stock, liquidation preference per share | $ / shares | $ 1,000 |  |  |  |
Net proceeds, after underwriting discounts and expenses | $ 175,500,000 |  |  |  |
Preferred stock, voting rights | Holders of the Series A Preferred Stock will not have voting rights |  |  |  |
Preferred stock, redemption price per share | $ / shares | $ 1,000 |  |  |  |
Preferred Stock, redemption date | Aug. 01, 2026 |  |  |  |
Preferred Stock, Redemption Terms | The Company may redeem the Series A Preferred Stock at its option, (i) in whole or in part, from time to time, on any dividend payment date on or after August 1, 2026 or (ii) in whole but not in part, at any time within 90 days following a regulatory capital treatment event, in either case at a redemption price equal to $1,000 per share (equivalent to $25 per depositary share), plus any declared and unpaid dividends. |  |  |  |
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 |  |
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 |  |  | $ 44,000,000.0 | 53,000,000.0 |
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 | Other Assets |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Variable interest entity, nonconsolidated, carrying amount, assets |  |  | $ 136,600,000 | $ 143,000,000.0 |

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