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Commitments and Contingencies (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2020
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]          
Carrying amount included in other assets $ 262,855,000 $ 146,612,000      
Amount of future funding commitments included in carrying amount 133,946,000 78,266,000      
Permanent and short-term construction loans and letter of credit commitments 84,552,000 2,124,000      
Funded portion of permanent and short-term loans and letters of credit 9,762,000 3,196,000      
Contractual amount net of risk participations 30,000,000 33,000,000      
Financing Receivable, Allowance for Credit Loss 605,736,000 281,402,000 $ 281,402,000 $ 250,555,000 $ 249,268,000
Guarantor Obligations, Advanced Payment from Merchant, Reserve 2,700,000        
Other Assets          
Loss Contingencies [Line Items]          
Guarantor obligations, advanced payment to merchant 15,600,000 21,400,000      
Unfunded Loan Commitment          
Loss Contingencies [Line Items]          
Current Expected Credit Losses     $ 27,400,000    
Financing Receivable, Allowance for Credit Loss   1,400,000      
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 [Member]          
Loss Contingencies [Line Items]          
Total letters of credit and unfunded lending commitments 14,768,588,000 13,117,770,000      
Guarantor obligations, monetary amount 77,970,000,000 74,200,000,000      
Letters of credit          
Loss Contingencies [Line Items]          
Total letters of credit and unfunded lending commitments 190,562,000 202,614,000      
Commitments to fund commercial and industrial loans          
Loss Contingencies [Line Items]          
Total letters of credit and unfunded lending commitments 8,200,608,000 7,018,152,000      
Commitments to fund commercial real estate, construction, and land development loans          
Loss Contingencies [Line Items]          
Total letters of credit and unfunded lending commitments 3,290,041,000 3,032,252,000      
Commitments under home equity lines of credit          
Loss Contingencies [Line Items]          
Total letters of credit and unfunded lending commitments 1,602,831,000 1,501,452,000      
Unused credit card lines          
Loss Contingencies [Line Items]          
Total letters of credit and unfunded lending commitments 1,012,313,000 877,929,000      
Other loan commitments          
Loss Contingencies [Line Items]          
Total letters of credit and unfunded lending commitments $ 472,233,000 $ 485,371,000