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Commitments and Contingencies (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Loss Contingencies [Line Items]                
Allowance for loan losses $ 407,837,000 $ 516,708,000 $ 407,837,000 $ 516,708,000 $ 414,956,000 $ 427,597,000 $ 563,214,000 $ 605,736,000
Carrying amount included in other assets 471,264,000   471,264,000     438,322,000    
Amount of future funding commitments 255,031,000   255,031,000     250,733,000    
Permanent and short-term construction loans and letter of credit commitments 164,957,000   164,957,000     204,391,000    
Funded portion of permanent and short-term loans and letters of credit 159,721,000   159,721,000     104,315,000    
Minimum                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 0   0          
Maximum                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 5,000,000   5,000,000          
Guarantee obligations                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 16,934,388,000   16,934,388,000     16,256,231,000    
Maximum potential exposure for sponsored transactions 31,000,000,000 $ 28,890,000,000 59,600,000,000 $ 55,150,000,000        
Letters of credit                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 202,904,000   202,904,000     183,463,000    
Contractual amount net of risk participations 26,100,000   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 9,794,706,000   9,794,706,000     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 3,829,403,000   3,829,403,000     3,593,171,000    
Commitments under home equity lines of credit                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 1,951,166,000   1,951,166,000     1,805,869,000    
Unused credit card lines                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 475,843,000   475,843,000     473,582,000    
Other loan commitments                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 680,366,000   680,366,000     604,353,000    
Permanent and short-term construction loans and letter of credit commitments                
Loss Contingencies [Line Items]                
Contractual amount net of risk participations 3,700,000   3,700,000     6,000,000    
Funded portion of permanent and short-term loans and letters of credit                
Loss Contingencies [Line Items]                
Contractual amount net of risk participations 4,100,000   4,100,000     3,000,000    
Unfunded Loan Commitment                
Loss Contingencies [Line Items]                
Allowance for loan losses $ 50,600,000   $ 50,600,000     $ 41,900,000