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Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment $ 35,278 $ 30,307
Collectively evaluated for impairment 8,825,597 7,362,755
Loans, net of unearned income 9,083,129 7,620,322
Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Acquired with deteriorated credit quality 222,254 227,260
Commercial, financial, agricultural    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 2,445 3,064
Collectively evaluated for impairment 1,264,324 1,021,014
Loans, net of unearned income 1,295,912 1,039,393
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Acquired with deteriorated credit quality 29,143 15,315
Real estate – construction    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 10,043 1,777
Collectively evaluated for impairment 730,625 631,612
Loans, net of unearned income 740,668 633,389
Real estate – construction | Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Acquired with deteriorated credit quality 0 0
Real estate – 1-4 family mortgage    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 14,238 14,482
Collectively evaluated for impairment 2,732,862 2,275,270
Loans, net of unearned income 2,795,343 2,343,721
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Acquired with deteriorated credit quality 48,243 53,969
Real estate – commercial mortgage    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 8,059 10,545
Collectively evaluated for impairment 3,903,012 3,260,648
Loans, net of unearned income 4,051,509 3,427,530
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Acquired with deteriorated credit quality 140,438 156,337
Installment loans to individuals    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 493 439
Collectively evaluated for impairment 194,774 174,211
Loans, net of unearned income 199,697 176,289
Installment loans to individuals | Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Acquired with deteriorated credit quality $ 4,430 $ 1,639