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Loans - Loans Individually Evaluated for Impairment by Class of Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Unpaid principal balance $ 59,381 $ 66,585  
Recorded investment 48,144 56,564 $ 70,426
Allowance for loan losses allocated 2,273 684  
Impaired Financing Receivable, Average Recorded Investment 51,041 67,070 79,496
Impaired Financing Receivable, Interest Income, Cash Basis Method 1,890 2,708 4,777
Commercial      
Financing Receivable, Impaired [Line Items]      
Recorded investment 1,866 1,324 2,226
Impaired Financing Receivable, Average Recorded Investment 1,709 1,729 5,503
Impaired Financing Receivable, Interest Income, Cash Basis Method 34 64 66
Commercial      
Financing Receivable, Impaired [Line Items]      
Recorded investment 2,732 19,059 23,102
Allowance for loan losses allocated 18 1  
Impaired Financing Receivable, Average Recorded Investment 5,308 20,490 24,341
Impaired Financing Receivable, Interest Income, Cash Basis Method 114 778 2,942
Commercial, financial and agricultural      
Financing Receivable, Impaired [Line Items]      
Recorded investment 15,120 18,039 20,624
Allowance for loan losses allocated 2,169 681  
Impaired Financing Receivable, Average Recorded Investment 21,000 23,154 26,821
Impaired Financing Receivable, Interest Income, Cash Basis Method 695 963 885
Commercial real estate      
Financing Receivable, Impaired [Line Items]      
Recorded investment 28,426 18,142 24,474
Allowance for loan losses allocated 86 2  
Impaired Financing Receivable, Average Recorded Investment 23,024 21,692 22,828
Impaired Financing Receivable, Interest Income, Cash Basis Method $ 1,047 903 884
Consumer      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Average Recorded Investment   $ 5 $ 3