| **Loans and Allowance for Loan Losses (Impaired Loans, Average Recorded Investment and Interest Income Recognized) (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended | 6 Months Ended |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                |           |           |   |   |
| With no related allowance recorded, average recorded investment                                                                                                                | $ 30,382       | $ 54,039       | $ 30,705 | $ 54,804 |
| With no related allowance recorded, interest income recognized                                                                                                                 | 63             | 35             | 206 | 185 |
| With an allowance recorded, average recorded investment                                                                                                                        | 9,763          | 6,064          | 9,820 | 6,109 |
| With an allowance recorded, interest income recognized                                                                                                                         | 47             | 4              | 123 | 11 |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                     | 40,145         | 60,103         | 40,525 | 60,913 |
| Impaired Financing Receivable, Interest Income, Cash Basis Method                                                                                                              | 110            | 39             | 329 | 196 |
| Commercial and agricultural [Member]                                                                                                                                           |           |           |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                |           |           |   |   |
| With no related allowance recorded, average recorded investment                                                                                                                | 242            | 1,398          | 242 | 1,414 |
| With no related allowance recorded, interest income recognized                                                                                                                 | 0              | 1              | 0 | 8 |
| With an allowance recorded, average recorded investment                                                                                                                        | 0              | 107            | 0 | 107 |
| With an allowance recorded, interest income recognized                                                                                                                         | 0              | 0              | 0 | 0 |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                     | 242            | 1,505          | 242 | 1,521 |
| Impaired Financing Receivable, Interest Income, Cash Basis Method                                                                                                              | 0              | 1              | 0 | 8 |
| Real estate - construction [Member]                                                                                                                                            |           |           |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                |           |           |   |   |
| With no related allowance recorded, average recorded investment                                                                                                                | 2,191          | 9,513          | 2,209 | 9,705 |
| With no related allowance recorded, interest income recognized                                                                                                                 | 7              | 0              | 18 | 0 |
| With an allowance recorded, average recorded investment                                                                                                                        | 583            | 219            | 594 | 220 |
| With an allowance recorded, interest income recognized                                                                                                                         | 0              | 3              | 0 | 6 |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                     | 2,774          | 9,732          | 2,803 | 9,925 |
| Impaired Financing Receivable, Interest Income, Cash Basis Method                                                                                                              | 7              | 3              | 18 | 6 |
| Real estate - mortgage, 1-4 family residential [Member]                                                                                                                        |           |           |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                |           |           |   |   |
| With no related allowance recorded, average recorded investment                                                                                                                | 8,263          | 12,662         | 8,250 | 12,643 |
| With no related allowance recorded, interest income recognized                                                                                                                 | 23             | 9              | 51 | 33 |
| With an allowance recorded, average recorded investment                                                                                                                        | 3,706          | 1,662          | 3,722 | 1,682 |
| With an allowance recorded, interest income recognized                                                                                                                         | 14             | 1              | 32 | 4 |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                     | 11,969         | 14,324         | 11,972 | 14,325 |
| Impaired Financing Receivable, Interest Income, Cash Basis Method                                                                                                              | 37             | 10             | 83 | 37 |
| Real estate - mortgage, commercial [Member]                                                                                                                                    |           |           |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                |           |           |   |   |
| With no related allowance recorded, average recorded investment                                                                                                                | 19,686         | 30,466         | 20,004 | 31,042 |
| With no related allowance recorded, interest income recognized                                                                                                                 | 33             | 25             | 137 | 144 |
| With an allowance recorded, average recorded investment                                                                                                                        | 5,474          | 3,912          | 5,504 | 3,933 |
| With an allowance recorded, interest income recognized                                                                                                                         | 33             | 0              | 91 | 0 |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                     | 25,160         | 34,378         | 25,508 | 34,975 |
| Impaired Financing Receivable, Interest Income, Cash Basis Method                                                                                                              | 66             | 25             | 228 | 144 |
| Consumer [Member]                                                                                                                                                              |           |           |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                |           |           |   |   |
| With no related allowance recorded, average recorded investment                                                                                                                | 0              | 0              | 0 | 0 |
| With no related allowance recorded, interest income recognized                                                                                                                 | 0              | 0              | 0 | 0 |
| With an allowance recorded, average recorded investment                                                                                                                        | 0              | 164            | 0 | 167 |
| With an allowance recorded, interest income recognized                                                                                                                         | 0              | 0              | 0 | 1 |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                     | 0              | 164            | 0 | 167 |
| Impaired Financing Receivable, Interest Income, Cash Basis Method                                                                                                              | $ 0            | $ 0            | $ 0 | $ 1 |

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| - Definition
Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.
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| - Definition
Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.
+ References
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| - Definition
Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired.
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Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.
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| - Definition
Amount of interest income on financing receivables, for which there is a related allowance for credit losses, recognized on a cash-basis method of accounting that the financing receivables were impaired.
+ References
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