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Loans and Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income $ 23,086,701 $ 22,424,501
Loan losses, allowance 280,881 285,050
Loans and Leases Receivable, Net Amount 22,805,820 22,139,451
Commercial real estate - Owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,869,785 2,802,227
Commercial real estate - Non-owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 5,573,181 5,203,384
Consumer real estate – mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 3,086,916 3,099,172
Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,568,969 2,901,746
Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 8,576,528 8,038,457
Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income $ 411,322 $ 379,515