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Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]    
Individually evaluated for impairment $ 51,179 $ 35,278
Collectively evaluated for impairment 9,466,195 8,825,597
Loans, net of unearned income 9,689,638 9,083,129
Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Acquired with deteriorated credit quality 172,264 222,254
Commercial, financial, agricultural    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Individually evaluated for impairment 8,460 2,445
Collectively evaluated for impairment 1,329,974 1,264,324
Loans, net of unearned income 1,367,972 1,295,912
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Acquired with deteriorated credit quality 29,538 29,143
Real estate – construction    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Individually evaluated for impairment 12,416 10,043
Collectively evaluated for impairment 813,204 730,625
Loans, net of unearned income 826,483 740,668
Real estate – construction | Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Acquired with deteriorated credit quality 863 0
Real estate – 1-4 family mortgage    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Individually evaluated for impairment 20,262 14,238
Collectively evaluated for impairment 2,810,808 2,732,862
Loans, net of unearned income 2,866,613 2,795,343
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Acquired with deteriorated credit quality 35,543 48,243
Real estate – commercial mortgage    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Individually evaluated for impairment 9,550 8,059
Collectively evaluated for impairment 4,131,582 3,903,012
Loans, net of unearned income 4,244,265 4,051,509
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Acquired with deteriorated credit quality 103,133 140,438
Installment loans to individuals    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Individually evaluated for impairment 491 493
Collectively evaluated for impairment 380,627 194,774
Loans, net of unearned income 384,305 199,697
Installment loans to individuals | Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Acquired with deteriorated credit quality $ 3,187 $ 4,430