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Loans - Composition of Loan Portfolio By Class of Loan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment $ 14,000 $ 3,500  
Impaired Financing Receivable, Related Allowance 2,273 684  
Impaired Financing Receivable, Unpaid Principal Balance 59,381 66,585  
Recorded investment 48,144 56,564 $ 70,426
Loan Balance 5,692,132 5,372,483  
Accrued Interest Receivable 17,666 16,659  
Recorded Investment 5,709,798 5,389,142  
Net accretion of purchase accounting adjustments (793) 0 0
Commercial, financial and agricultural      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 11,407 3,335  
Impaired Financing Receivable, Related Allowance 2,169 681  
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 13,736 5,394  
Recorded investment 15,120 18,039 20,624
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 8,999 19,899  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 3,713 14,704  
Loan Balance [1] 1,072,786 1,053,453  
Accrued Interest Receivable [1] 4,603 4,413  
Recorded Investment [1] 1,077,389 1,057,866  
Commercial real estate      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 2,213 82  
Impaired Financing Receivable, Related Allowance 86 2  
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 2,255 137  
Recorded investment 28,426 18,142 24,474
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 26,663 18,974  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 26,213 18,060  
Loan Balance [1] 1,283,045 1,167,607  
Accrued Interest Receivable [1] 4,750 4,283  
Recorded Investment [1] 1,287,795 1,171,890  
Construction real estate      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 248,274 181,470  
Recorded Investment 249,233 182,017  
Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Recorded investment 1,866 1,324 2,226
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 4,679 2,788  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,866 1,324  
Loan Balance 175,300 125,389  
Accrued Interest Receivable 801 401  
Recorded Investment 176,101 125,790  
Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 70,541 52,203  
Accrued Interest Receivable 151 133  
Recorded Investment 70,692 52,336  
Installment      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 2,433 3,878  
Accrued Interest Receivable 7 13  
Recorded Investment 2,440 3,891  
Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 358 47  
Impaired Financing Receivable, Related Allowance 18 1  
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 358 47  
Recorded investment 2,732 19,059 $ 23,102
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 2,691 19,346  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,374 19,012  
Loan Balance 429,730 393,094  
Accrued Interest Receivable 1,150 1,029  
Recorded Investment 430,880 394,123  
Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 1,134,278 1,110,426  
Accrued Interest Receivable 1,227 1,516  
Recorded Investment 1,135,505 1,111,942  
HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 215,283 203,178  
Accrued Interest Receivable 1,159 974  
Recorded Investment 216,442 204,152  
Installment      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 14,327 18,526  
Accrued Interest Receivable 36 53  
Recorded Investment 14,363 18,579  
Consumer      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 1,292,136 1,241,736  
Accrued Interest Receivable 3,756 3,808  
Recorded Investment 1,295,892 1,245,544  
Leases      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 2,273 2,993  
Accrued Interest Receivable 26 36  
Recorded Investment $ 2,299 $ 3,029  
[1] Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.