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Commitments and Contingencies (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]                
Allowance for loan losses $ 516,708,000 $ 588,648,000 $ 516,708,000 $ 588,648,000 $ 563,214,000 $ 605,736,000 $ 493,452,000 $ 281,402,000
Carrying amount included in other assets 350,692,000   350,692,000     262,855,000    
Amount of future funding commitments included in carrying amount 198,575,000   198,575,000     133,946,000    
Permanent and short-term construction loans and letter of credit commitments 200,476,000   200,476,000     84,552,000    
Funded portion of permanent and short-term loans and letters of credit 37,362,000   37,362,000     9,762,000    
Contractual amount net of risk participations 28,500,000   28,500,000     30,200,000    
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          
Other assets held for sale                
Loss Contingencies [Line Items]                
Guarantor obligations, advanced payment from merchant 15,300,000   15,300,000     15,600,000    
Guarantee obligations                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 15,339,501,000   15,339,501,000     14,768,588,000    
Maximum potential exposure for sponsored transactions 28,890,000,000 $ 16,400,000,000 55,150,000,000 $ 34,750,000,000        
Letters of credit*                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 185,433,000   185,433,000     190,562,000    
Commitments to fund commercial and industrial loans                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 8,617,252,000   8,617,252,000     8,200,608,000    
Commitments to fund commercial real estate, construction, and land development loans                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 3,286,077,000   3,286,077,000     3,290,041,000    
Commitments under home equity lines of credit                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 1,681,782,000   1,681,782,000     1,602,831,000    
Unused credit card lines                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 1,002,367,000   1,002,367,000     1,012,313,000    
Other loan commitments                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 566,590,000   566,590,000     472,233,000    
Unfunded Loan Commitment                
Loss Contingencies [Line Items]                
Allowance for loan losses $ 46,900,000   $ 46,900,000     $ 47,800,000