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Commitments and Contingencies (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Loss Contingencies [Line Items]        
Allowance for loan losses $ 414,956,000 $ 563,214,000 $ 427,597,000 $ 605,736,000
Carrying amount included in other assets 446,326,000   426,137,000  
Amount of future funding commitments 263,024,000   250,733,000  
Permanent and short-term construction loans and letter of credit commitments 199,623,000   204,391,000  
Funded portion of permanent and short-term loans and letters of credit 135,415,000   104,315,000  
Minimum        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 0      
Maximum        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 5,000,000      
Guarantee obligations        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 16,290,511,000   16,256,231,000  
Maximum potential exposure for sponsored transactions 28,610,000,000 $ 26,250,000,000    
Letters of credit        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 182,873,000   183,463,000  
Contractual amount net of risk participations 26,100,000   26,100,000  
Commitments to fund commercial and industrial loans        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 9,491,517,000   9,595,793,000  
Commitments to fund commercial real estate, construction, and land development loans        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 3,639,109,000   3,593,171,000  
Commitments under home equity lines of credit        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 1,847,718,000   1,805,869,000  
Unused credit card lines        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 478,586,000   473,582,000  
Other loan commitments        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 650,708,000   604,353,000  
Permanent and short-term construction loans and letter of credit commitments        
Loss Contingencies [Line Items]        
Contractual amount net of risk participations 2,000,000   3,000,000  
Funded portion of permanent and short-term loans and letters of credit        
Loss Contingencies [Line Items]        
Contractual amount net of risk participations 2,900,000   3,000,000  
Unfunded Loan Commitment        
Loss Contingencies [Line Items]        
Allowance for loan losses $ 47,300,000   $ 41,900,000