XML 69 R59.htm IDEA: XBRL DOCUMENT v3.24.0.1
Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
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