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Loans and Asset Quality Information (Schedule of Impaired Loans) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
All Total Loans [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment $ 21,639 $ 29,930
Impaired loans with no related allowance - Unpaid Principal Balance 26,274 39,484
Impaired loans with no related allowance - Average Recorded Investment 22,635 34,766
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 18,231 23,749
Impaired loans with allowance - Unpaid Principal Balance 18,701 24,413
Impaired loans with related allowance - Related Allowance 1,939 3,311
Impaired loans with related allowance - Average Recorded Investment 19,078 23,723
All Total Loans [Member] | Commercial, financial, and agricultural [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 1,674 360
Impaired loans with no related allowance - Unpaid Principal Balance 1,796 422
Impaired loans with no related allowance - Average Recorded Investment 872 235
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 58 676
Impaired loans with allowance - Unpaid Principal Balance 110 709
Impaired loans with related allowance - Related Allowance 9 348
Impaired loans with related allowance - Average Recorded Investment 229 616
All Total Loans [Member] | Real estate - construction, land development & other land loans [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 3,397 3,944
Impaired loans with no related allowance - Unpaid Principal Balance 4,703 7,421
Impaired loans with no related allowance - Average Recorded Investment 3,746 4,651
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 784 954
Impaired loans with allowance - Unpaid Principal Balance 800 976
Impaired loans with related allowance - Related Allowance 169 241
Impaired loans with related allowance - Average Recorded Investment 861 1,980
All Total Loans [Member] | Real estate - mortgage - residential (1-4 family) first mortgages [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 10,321 12,346
Impaired loans with no related allowance - Unpaid Principal Balance 12,522 14,644
Impaired loans with no related allowance - Average Recorded Investment 9,098 11,258
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 11,497 15,285
Impaired loans with allowance - Unpaid Principal Balance 11,725 15,691
Impaired loans with related allowance - Related Allowance 1,306 1,912
Impaired loans with related allowance - Average Recorded Investment 12,021 15,636
All Total Loans [Member] | Real estate - mortgage - home equity loans / lines of credit [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 143 121
Impaired loans with no related allowance - Unpaid Principal Balance 202 175
Impaired loans with no related allowance - Average Recorded Investment 140 505
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 173 667
Impaired loans with allowance - Unpaid Principal Balance 179 678
Impaired loans with related allowance - Related Allowance 11 344
Impaired loans with related allowance - Average Recorded Investment 358 430
All Total Loans [Member] | Real estate mortgage commercial and other [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 6,103 13,156
Impaired loans with no related allowance - Unpaid Principal Balance 7,049 16,818
Impaired loans with no related allowance - Average Recorded Investment 8,777 18,112
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 5,719 6,094
Impaired loans with allowance - Unpaid Principal Balance 5,887 6,279
Impaired loans with related allowance - Related Allowance 444 421
Impaired loans with related allowance - Average Recorded Investment 5,548 4,950
All Total Loans [Member] | Installment loans to individuals [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 1 3
Impaired loans with no related allowance - Unpaid Principal Balance 2 4
Impaired loans with no related allowance - Average Recorded Investment 2 5
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 73
Impaired loans with allowance - Unpaid Principal Balance 80
Impaired loans with related allowance - Related Allowance 45
Impaired loans with related allowance - Average Recorded Investment $ 61 111
Covered [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment   5,231
Impaired loans with no related allowance - Unpaid Principal Balance   8,529
Impaired loans with no related allowance - Average Recorded Investment   5,607
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment   3,213
Impaired loans with allowance - Unpaid Principal Balance   3,476
Impaired loans with related allowance - Related Allowance   624
Impaired loans with related allowance - Average Recorded Investment   $ 3,742