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Loans and Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans $ 22,897,935 $ 22,424,501
Loan losses, allowance 273,747 285,050
Loans and Leases Receivable, Net Amount 22,624,188 22,139,451
Commercial real estate - Owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 2,817,689 2,802,227
Commercial real estate - Non-owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 5,368,804 5,203,384
Consumer real estate – mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 3,335,537 3,099,172
Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 2,791,611 2,901,746
Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 8,144,170 8,038,457
Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans $ 440,124 $ 379,515