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Loans - Loans Individually Evaluated for Impairment by Class of Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance $ 66,585 $ 95,358  
Recorded investment 56,564 70,426 $ 80,664
Allowance for loan losses allocated 684 548  
Impaired Financing Receivable, Average Recorded Investment 67,070 79,496 70,762
Impaired Financing Receivable, Interest Income, Cash Basis Method 2,708 4,777 1,963
Commercial, financial and agricultural      
Financing Receivable, Impaired [Line Items]      
Recorded investment 18,039 20,624 30,595
Impaired Financing Receivable, Average Recorded Investment 23,154 26,821 20,179
Impaired Financing Receivable, Interest Income, Cash Basis Method 963 885 340
Commercial real estate      
Financing Receivable, Impaired [Line Items]      
Recorded investment 18,142 24,474 18,025
Impaired Financing Receivable, Average Recorded Investment 21,692 22,828 17,883
Impaired Financing Receivable, Interest Income, Cash Basis Method 903 884 550
Commercial      
Financing Receivable, Impaired [Line Items]      
Recorded investment 1,324 2,226 6,720
Impaired Financing Receivable, Average Recorded Investment 1,729 5,503 7,732
Impaired Financing Receivable, Interest Income, Cash Basis Method 64 66 47
Commercial      
Financing Receivable, Impaired [Line Items]      
Recorded investment 19,059 23,102 25,324
Impaired Financing Receivable, Average Recorded Investment 20,490 24,341 24,968
Impaired Financing Receivable, Interest Income, Cash Basis Method 778 2,942 $ 1,026
Consumer      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Average Recorded Investment 5 3  
With no related allowance recorded | Commercial, financial and agricultural      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 19,899 41,075  
Recorded investment 14,704 19,965  
With no related allowance recorded | Commercial real estate      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 18,974 23,961  
Recorded investment 18,060 23,474  
With no related allowance recorded | Commercial      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 2,788 3,662  
Recorded investment 1,324 2,226  
With no related allowance recorded | Commercial      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 19,346 24,409  
Recorded investment $ 19,012 $ 22,687