| **Regulartory and Other Maters (Details)**                                                                       | Dec. 31, 2012 | Dec. 31, 2011 |
|------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Compliance with Regulatory Capital Requirements under Banking Regulations [Abstract]**                         |          |          |
| Total risk-based capital ratio, Adequately Capitalized                                                           | 8.00%         |          |
| Total risk-based capital ratio, Well Capitalized                                                                 | 10.00%        |          |
| Tier 1 risk-based capital ratio, Adequately Capitalized                                                          | 4.00%         |          |
| Tier 1 risk-based capital ratio, Well Capitalized                                                                | 6.00%         |          |
| Leverage capital ratio, Adequately Capitalized                                                                   | 4.00%         |          |
| Leverage capital ratio, Well Capitalized                                                                         | 5.00%         |          |
| CommunityOne [Member]                                                                                            |          |          |
| **Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]**                       |          |          |
| Capital Required to be Well Capitalized to Risk Weighted Assets under Consent Order with OCC                     | 12.00%        | 12.00%        |
| Tier One Leverage Capital Required to be Well Capitalized to Average Assets under Consent Order with OCC         | 9.00%         | 9.00%         |
| **Compliance with Regulatory Capital Requirements under Banking Regulations [Abstract]**                         |          |          |
| Total risk-based capital ratio                                                                                   | 11.40%        | 14.52%        |
| Total risk-based capital ratio, Adequately Capitalized                                                           | 8.00%         | 8.00%         |
| Total risk-based capital ratio, Well Capitalized                                                                 | 10.00%        | 10.00%        |
| Tier 1 risk-based capital ratio                                                                                  | 10.13%        | 13.23%        |
| Tier 1 risk-based capital ratio, Adequately Capitalized                                                          | 4.00%         | 4.00%         |
| Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets under Consent Order with OCC | 9.00%         | 9.00%         |
| Tier 1 risk-based capital ratio, Well Capitalized                                                                | 6.00%         | 6.00%         |
| Leverage capital ratio                                                                                           | 6.17%         | 7.39%         |
| Leverage capital ratio, Adequately Capitalized                                                                   | 4.00%         | 4.00%         |
| Leverage capital ratio, Well Capitalized                                                                         | 5.00%         | 5.00%         |
| Bank of Granite [Member]                                                                                         |          |          |
| **Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]**                       |          |          |
| Capital Required to be Well Capitalized to Risk Weighted Assets under Consent Order with OCC                     | 12.00%        | 12.00%        |
| Tier One Leverage Capital Required to be Well Capitalized to Average Assets under Consent Order with OCC         | 8.00%         | 8.00%         |
| **Compliance with Regulatory Capital Requirements under Banking Regulations [Abstract]**                         |          |          |
| Total risk-based capital ratio                                                                                   | 16.30%        | 12.04%        |
| Total risk-based capital ratio, Adequately Capitalized                                                           | 8.00%         | 8.00%         |
| Total risk-based capital ratio, Well Capitalized                                                                 | 10.00%        | 10.00%        |
| Tier 1 risk-based capital ratio                                                                                  | 15.04%        | 12.04%        |
| Tier 1 risk-based capital ratio, Adequately Capitalized                                                          | 4.00%         | 4.00%         |
| Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets under Consent Order with OCC | 8.00%         | 8.00%         |
| Tier 1 risk-based capital ratio, Well Capitalized                                                                | 6.00%         | 6.00%         |
| Leverage capital ratio                                                                                           | 8.12%         | 7.19%         |
| Leverage capital ratio, Adequately Capitalized                                                                   | 4.00%         | 4.00%         |
| Leverage capital ratio, Well Capitalized                                                                         | 5.00%         | 5.00%         |

| X                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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No definition available.
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Tier One Leverage Capital Required to be Well Capitalized to Average Assets under Consent Order with the Office of the Comptroller of the Currency (OCC)
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No definition available.
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No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.
+ References
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| - Definition
The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total Capital divided by risk weighted assets as defined in the regulations.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 15 -Subparagraph 3a -IssueDate 2006-05-01 -Chapter 17 -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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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tier 1 Leverage Capital divided by average assets as defined in the regulations.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tier 1 capital divided by risk weighted assets as defined by regulations.
+ References
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