| **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 | 9 Months Ended |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                |           |           |   |   |
| With no related alowance recorded, average recorded investment                                                                                                                 | $ 48,800       | $ 75,948       | $ 50,485 | $ 81,445 |
| With no related allowance recorded, interest income recognized                                                                                                                 | 7              | 812            | 102 | 2,188 |
| With an allowance recorded, average recorded investment                                                                                                                        | 2,975          | 15,301         | 6,109 | 15,790 |
| With an allowance recorded, interest income recognized                                                                                                                         | 0              | 84             | 11 | 378 |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                     | 51,775         | 91,249         | 56,594 | 97,235 |
| Impaired Financing Receivable, Interest Income, Cash Basis Method                                                                                                              | 7              | 896            | 113 | 2,566 |
| Commercial and agricultural [Member]                                                                                                                                           |           |           |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                |           |           |   |   |
| With no related alowance recorded, average recorded investment                                                                                                                 | 434            | 1,557          | 455 | 1,879 |
| With no related allowance recorded, interest income recognized                                                                                                                 | 0              | 56             | 7 | 152 |
| With an allowance recorded, average recorded investment                                                                                                                        | 0              | 1,274          | 107 | 1,266 |
| With an allowance recorded, interest income recognized                                                                                                                         | 0              | 6              | 0 | 36 |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                     | 434            | 2,831          | 562 | 3,145 |
| Impaired Financing Receivable, Interest Income, Cash Basis Method                                                                                                              | 0              | 62             | 7 | 188 |
| Real estate - construction [Member]                                                                                                                                            |           |           |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                |           |           |   |   |
| With no related alowance recorded, average recorded investment                                                                                                                 | 10,006         | 15,484         | 10,300 | 18,140 |
| With no related allowance recorded, interest income recognized                                                                                                                 | 3              | 104            | 23 | 350 |
| With an allowance recorded, average recorded investment                                                                                                                        | 97             | 2,802          | 220 | 2,873 |
| With an allowance recorded, interest income recognized                                                                                                                         | 0              | 9              | 6 | 32 |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                     | 10,103         | 18,286         | 10,520 | 21,013 |
| Impaired Financing Receivable, Interest Income, Cash Basis Method                                                                                                              | 3              | 113            | 29 | 382 |
| Real estate - mortgage, 1-4 family residential [Member]                                                                                                                        |           |           |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                |           |           |   |   |
| With no related alowance recorded, average recorded investment                                                                                                                 | 10,516         | 14,265         | 10,442 | 15,096 |
| With no related allowance recorded, interest income recognized                                                                                                                 | 0              | 81             | 14 | 292 |
| With an allowance recorded, average recorded investment                                                                                                                        | 2,605          | 6,436          | 1,682 | 6,869 |
| With an allowance recorded, interest income recognized                                                                                                                         | 0              | 41             | 4 | 163 |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                     | 13,121         | 20,701         | 12,124 | 21,965 |
| Impaired Financing Receivable, Interest Income, Cash Basis Method                                                                                                              | 0              | 122            | 18 | 455 |
| Real estate - mortgage, commercial [Member]                                                                                                                                    |           |           |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                |           |           |   |   |
| With no related alowance recorded, average recorded investment                                                                                                                 | 27,844         | 44,480         | 29,288 | 46,051 |
| With no related allowance recorded, interest income recognized                                                                                                                 | 4              | 567            | 58 | 1,388 |
| With an allowance recorded, average recorded investment                                                                                                                        | 273            | 4,689          | 3,933 | 4,687 |
| With an allowance recorded, interest income recognized                                                                                                                         | 0              | 27             | 0 | 145 |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                     | 28,117         | 49,169         | 33,221 | 50,738 |
| Impaired Financing Receivable, Interest Income, Cash Basis Method                                                                                                              | 4              | 594            | 58 | 1,533 |
| Consumer [Member]                                                                                                                                                              |           |           |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                                |           |           |   |   |
| With no related alowance recorded, average recorded investment                                                                                                                 | 0              | 162            | 0 | 279 |
| With no related allowance recorded, interest income recognized                                                                                                                 | 0              | 4              | 0 | 6 |
| With an allowance recorded, average recorded investment                                                                                                                        | 0              | 100            | 167 | 95 |
| With an allowance recorded, interest income recognized                                                                                                                         | 0              | 1              | 1 | 2 |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                     | 0              | 262            | 167 | 374 |
| Impaired Financing Receivable, Interest Income, Cash Basis Method                                                                                                              | $ 0            | $ 5            | $ 1 | $ 8 |

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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.
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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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| - 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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