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Commitments and Contingencies (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]                
Allowance for loan losses $ 492,243,000 $ 603,800,000 $ 492,243,000 $ 603,800,000 $ 516,708,000 $ 605,736,000 $ 588,648,000 $ 281,402,000
Carrying amount included in other assets 380,624,000   380,624,000     262,855,000    
Amount of future funding commitments included in carrying amount 213,791,000   213,791,000     133,946,000    
Permanent and short-term construction loans and letter of credit commitments 172,285,000   172,285,000     82,786,000    
Funded portion of permanent and short-term loans and letters of credit 69,823,000   69,823,000     9,528,000    
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 15,895,718,000   15,895,718,000     14,768,588,000    
Maximum potential exposure for sponsored transactions 28,390,000,000 $ 20,230,000,000 83,540,000,000 $ 55,540,000,000        
Letters of credit                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 184,317,000   184,317,000     190,562,000    
Contractual amount net of risk participations 26,400,000   26,400,000     30,200,000    
Commitments to fund commercial and industrial loans                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 8,893,056,000   8,893,056,000     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 3,490,875,000   3,490,875,000     3,290,041,000    
Commitments under home equity lines of credit                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 1,738,063,000   1,738,063,000     1,602,831,000    
Unused credit card lines                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 1,008,471,000   1,008,471,000     1,012,313,000    
Other loan commitments                
Loss Contingencies [Line Items]                
Total letters of credit and unfunded lending commitments 580,936,000   580,936,000     472,233,000    
Permanent and short-term construction loans and letter of credit commitments                
Loss Contingencies [Line Items]                
Contractual amount net of risk participations 3,600,000   3,600,000     1,800,000    
Funded portion of permanent and short-term loans and letters of credit                
Loss Contingencies [Line Items]                
Contractual amount net of risk participations 2,400,000   2,400,000     234,000    
Unfunded Loan Commitment                
Loss Contingencies [Line Items]                
Allowance for loan losses $ 43,000,000   $ 43,000,000     $ 47,800,000