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Loans and Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income $ 22,520,300 $ 19,787,876
Loan losses, allowance 285,372 94,777
Loans and Leases Receivable, Net Amount 22,234,928 19,693,099
Commercial real estate- owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,708,306 2,669,766
Commercial real estate- Non-owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 5,384,018 5,039,452
Consumer real estate – mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 3,042,604 3,068,625
Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,574,494 2,430,483
Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 8,516,333 6,290,296
Consumer and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income $ 294,545 $ 289,254