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Loans and Asset Quality Information (Schedule of Information of Loans Modified in Troubled Debt Restructuring) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) N | Dec. 31, 2016 USD ($) N
All Total Loans [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs | N | 8 | 3
TDRs arising during period Pre-Modification | $ 3,835 | $ 1,824
TDRs arising during period Post-Modification | $ 3,797 | $ 1,881
All Total Loans [Member] | Commercial, financial, and agricultural [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs Accruing | N |  | 1
TDRs arising during period - Accruing Pre-Modification |  | $ 1,071
TDRs arising during period - Accruing Post-Modification |  | $ 1,071
Number of contracts, TDRs Nonaccrual | N | 1 |
TDRs arising during period - Nonaccrual Pre-Modification | $ 38 |
TDRs arising during period - Nonaccrual Post-Modification | $ 25 |
All Total Loans [Member] | Real estate - construction, land development & other land loans [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs Accruing | N |  |
TDRs arising during period - Accruing Pre-Modification |  |
TDRs arising during period - Accruing Post-Modification |  |
Number of contracts, TDRs Nonaccrual | N | 1 |
TDRs arising during period - Nonaccrual Pre-Modification | $ 32 |
TDRs arising during period - Nonaccrual Post-Modification | $ 32 |
All Total Loans [Member] | Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs Accruing | N |  | 1
TDRs arising during period - Accruing Pre-Modification |  | $ 598
TDRs arising during period - Accruing Post-Modification |  | $ 626
Number of contracts, TDRs Nonaccrual | N | 1 | 1
TDRs arising during period - Nonaccrual Pre-Modification | $ 215 | $ 155
TDRs arising during period - Nonaccrual Post-Modification | $ 215 | $ 184
All Total Loans [Member] | Real estate - mortgage - home equity loans / lines of credit [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs Accruing | N |  |
TDRs arising during period - Accruing Pre-Modification |  |
TDRs arising during period - Accruing Post-Modification |  |
Number of contracts, TDRs Nonaccrual | N |  |
TDRs arising during period - Nonaccrual Pre-Modification |  |
TDRs arising during period - Nonaccrual Post-Modification |  |
All Total Loans [Member] | Real estate - mortgage - commercial and other [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs Accruing | N | 5 |
TDRs arising during period - Accruing Pre-Modification | $ 3,550 |
TDRs arising during period - Accruing Post-Modification | $ 3,525 |
Number of contracts, TDRs Nonaccrual | N |  |
TDRs arising during period - Nonaccrual Pre-Modification |  |
TDRs arising during period - Nonaccrual Post-Modification |  |
All Total Loans [Member] | Installment loans to individuals [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs Accruing | N |  |
TDRs arising during period - Accruing Pre-Modification |  |
TDRs arising during period - Accruing Post-Modification |  |
Number of contracts, TDRs Nonaccrual | N |  |
TDRs arising during period - Nonaccrual Pre-Modification |  |
TDRs arising during period - Nonaccrual Post-Modification |  |
Covered [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs | N |  |
TDRs arising during period Pre-Modification |  |
TDRs arising during period Post-Modification |  |

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