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Loans - Loans Individually Evaluated for Impairment by Class of Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance $ 95,358 $ 109,305  
Recorded investment 70,426 80,664 $ 73,712
Allowance for loan losses allocated 548 4,191  
Impaired Financing Receivable, Average Recorded Investment 79,496 70,762 92,614
Impaired Financing Receivable, Interest Income, Cash Basis Method 4,777 1,963 2,678
Commercial, financial and agricultural      
Financing Receivable, Impaired [Line Items]      
Recorded investment 20,624 30,595 19,106
Impaired Financing Receivable, Average Recorded Investment 26,821 20,179 19,518
Impaired Financing Receivable, Interest Income, Cash Basis Method 885 340 360
Commercial real estate      
Financing Receivable, Impaired [Line Items]      
Recorded investment 24,474 18,025 21,989
Impaired Financing Receivable, Average Recorded Investment 22,828 17,883 31,945
Impaired Financing Receivable, Interest Income, Cash Basis Method 884 550 1,027
Remaining commercial      
Financing Receivable, Impaired [Line Items]      
Recorded investment 2,226 4,676 5,609
Impaired Financing Receivable, Average Recorded Investment 3,906 5,666 8,784
Impaired Financing Receivable, Interest Income, Cash Basis Method 66 26 61
Commercial      
Financing Receivable, Impaired [Line Items]      
Recorded investment 23,102 25,324 24,930
Impaired Financing Receivable, Average Recorded Investment 24,341 24,968 28,306
Impaired Financing Receivable, Interest Income, Cash Basis Method 2,942 1,026 1,084
Consumer      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Average Recorded Investment 3   403
Construction Real Estate Vision Commercial Land And Development [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment   2,044 2,078
Impaired Financing Receivable, Average Recorded Investment 1,597 2,066 3,658
Impaired Financing Receivable, Interest Income, Cash Basis Method   21 $ 146
With no related allowance recorded | Commercial, financial and agricultural      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 41,075 32,583  
Recorded investment 19,965 18,763  
With no related allowance recorded | Commercial real estate      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 23,961 15,138  
Recorded investment 23,474 14,916  
With no related allowance recorded | SEPH commercial land and development      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance   10,834  
Recorded investment   2,044  
With no related allowance recorded | Remaining commercial      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 3,662 2,506  
Recorded investment 2,226 1,531  
With no related allowance recorded | Commercial      
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance 24,409 23,798  
Recorded investment $ 22,687 $ 23,480