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Commitments and Contingencies (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]        
Financing Receivable, Allowance for Credit Loss $ 563,214,000 $ 493,452,000 $ 605,736,000 $ 281,402,000
Carrying amount included in other assets 303,676,000   262,855,000  
Amount of future funding commitments included in carrying amount 166,390,000   133,946,000  
Permanent and short-term construction loans and letter of credit commitments 155,060,000   84,552,000  
Funded portion of permanent and short-term loans and letters of credit 17,404,000   9,762,000  
Contractual amount net of risk participations 29,600,000   30,200,000  
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      
Other assets held for sale        
Loss Contingencies [Line Items]        
Guarantor obligations, advanced payment from merchant 15,500,000   15,600,000  
Guarantee obligations        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 15,023,908,000   14,768,588,000  
Maximum potential exposure for sponsored transactions 26,030,000,000.00 $ 18,370,000,000    
Letters of credit*        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 191,359,000   190,562,000  
Commitments to fund commercial and industrial loans        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 8,464,375,000   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 3,229,163,000   3,290,041,000  
Commitments under home equity lines of credit        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 1,643,659,000   1,602,831,000  
Unused credit card lines        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 984,268,000   1,012,313,000  
Other loan commitments        
Loss Contingencies [Line Items]        
Total letters of credit and unfunded lending commitments 511,084,000   472,233,000  
Unfunded Loan Commitment        
Loss Contingencies [Line Items]        
Financing Receivable, Allowance for Credit Loss $ 51,500,000   $ 47,800,000