| **Loans and Allowance for Loan Losses (Allowance for Loan Losses, by Segment Portfolio) (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended | 9 Months Ended |          |          |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|----------|----------|
||
| **Financing Receivable, Allowance for Credit Losses [Roll Forward]**                                                                                |           |           |     |     |   |   |
| Balance, beginning of period                                                                                                                        |           |           | $ 29,314 | $ 39,360 | $ 25,085 | $ 38,551 |
| Charge-offs                                                                                                                                         | (1,724)        | (9,276)        | (10,836) | (23,580) |   |   |
| Recoveries                                                                                                                                          | 2,376          | 1,552          | 8,206    | 4,202    |   |   |
| Provision for losses charged to continuing operations                                                                                               | (350)          | 32             | (1,297)  | 10,877   |   |   |
| Balance, end of period                                                                                                                              | 25,387         | 30,859         | 25,387   | 30,859   | 25,085 | 38,551 |
| Commercial and agricultural [Member]                                                                                                                |           |           |     |     |   |   |
| **Financing Receivable, Allowance for Credit Losses [Roll Forward]**                                                                                |           |           |     |     |   |   |
| Balance, beginning of period                                                                                                                        |           |           | 3,238    | 5,776    | 2,192 | 7,151 |
| Charge-offs                                                                                                                                         | (2)            | (1,156)        | (1,196)  | (2,774)  |   |   |
| Recoveries                                                                                                                                          | 465            | 286            | 1,376    | 777      |   |   |
| Provision for losses charged to continuing operations                                                                                               | (45)           | (1,128)        | (808)    | 1,374    |   |   |
| Balance, end of period                                                                                                                              | 2,610          | 5,153          | 2,610    | 5,153    | 2,192 | 7,151 |
| Real estate - construction [Member]                                                                                                                 |           |           |     |     |   |   |
| **Financing Receivable, Allowance for Credit Losses [Roll Forward]**                                                                                |           |           |     |     |   |   |
| Balance, beginning of period                                                                                                                        |           |           | 4,987    | 11,995   | 5,652 | 11,320 |
| Charge-offs                                                                                                                                         | (36)           | (2,465)        | (964)    | (8,761)  |   |   |
| Recoveries                                                                                                                                          | 1,039          | 323            | 2,106    | 1,169    |   |   |
| Provision for losses charged to continuing operations                                                                                               | (1,560)        | (3,195)        | (1,034)  | 1,580    |   |   |
| Balance, end of period                                                                                                                              | 5,095          | 5,983          | 5,095    | 5,983    | 5,652 | 11,320 |
| Real estate - mortgage, 1-4 family residential [Member]                                                                                             |           |           |     |     |   |   |
| **Financing Receivable, Allowance for Credit Losses [Roll Forward]**                                                                                |           |           |     |     |   |   |
| Balance, beginning of period                                                                                                                        |           |           | 8,701    | 8,885    | 7,400 | 8,784 |
| Charge-offs                                                                                                                                         | (394)          | (1,646)        | (3,563)  | (4,805)  |   |   |
| Recoveries                                                                                                                                          | 285            | 69             | 962      | 447      |   |   |
| Provision for losses charged to continuing operations                                                                                               | 1,493          | 2,787          | 2,684    | 5,467    |   |   |
| Balance, end of period                                                                                                                              | 8,784          | 9,994          | 8,784    | 9,994    | 7,400 | 8,784 |
| Real estate - mortgage, commercial [Member]                                                                                                         |           |           |     |     |   |   |
| **Financing Receivable, Allowance for Credit Losses [Roll Forward]**                                                                                |           |           |     |     |   |   |
| Balance, beginning of period                                                                                                                        |           |           | 9,627    | 11,063   | 7,387 | 9,218 |
| Charge-offs                                                                                                                                         | (592)          | (2,602)        | (2,853)  | (3,594)  |   |   |
| Recoveries                                                                                                                                          | 357            | 388            | 2,363    | 725      |   |   |
| Provision for losses charged to continuing operations                                                                                               | (677)          | 54             | (2,662)  | (1,136)  |   |   |
| Balance, end of period                                                                                                                              | 6,475          | 7,058          | 6,475    | 7,058    | 7,387 | 9,218 |
| Consumer [Member]                                                                                                                                   |           |           |     |     |   |   |
| **Financing Receivable, Allowance for Credit Losses [Roll Forward]**                                                                                |           |           |     |     |   |   |
| Balance, beginning of period                                                                                                                        |           |           | 2,761    | 1,641    | 2,454 | 2,078 |
| Charge-offs                                                                                                                                         | (700)          | (1,407)        | (2,260)  | (3,646)  |   |   |
| Recoveries                                                                                                                                          | 230            | 486            | 1,399    | 1,084    |   |   |
| Provision for losses charged to continuing operations                                                                                               | 439            | 1,514          | 523      | 3,592    |   |   |
| Balance, end of period                                                                                                                              | $ 2,423        | $ 2,671        | $ 2,423  | $ 2,671  | $ 2,454 | $ 2,078 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A valuation allowance for financing receivables that are expected to be uncollectible.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of recovery of financing receivables doubtful of collection that were previously charged off.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524
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| X                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of direct write-downs of financing receivables charged against the allowance.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 168, 169, 170 -IssueDate 2006-05-01 -Chapter 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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