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Allowance for Loan Losses - Summary of Loans and Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 9,693,463 $ 9,086,256
Unearned income (3,825) (3,127)
Loans, net of unearned income 9,689,638 9,083,129
Allowance for loan losses (52,162) (49,026)
Loans, net 9,637,476 9,034,103
Commercial, financial, agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 1,367,972 1,295,912
Loans, net of unearned income 1,367,972 1,295,912
Lease financing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 85,700 64,992
Real estate – construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 826,483 740,668
Loans, net of unearned income 826,483 740,668
Real estate – 1-4 family mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 2,866,613 2,795,343
Loans, net of unearned income 2,866,613 2,795,343
Real estate – commercial mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 4,244,265 4,051,509
Loans, net of unearned income 4,244,265 4,051,509
Installment loans to individuals    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 302,430 137,832
Loans, net of unearned income $ 384,305 $ 199,697