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Loans, Troubled Debt Restructuring (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 Contract | Jun. 30, 2012 Contract | Jun. 30, 2013 Contract | Jun. 30, 2012 Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled Debt Restructurings, Number of Contracts | 3 | 0 | 6 | 2
Troubled Debt Restructurings, Pre-Modification | $ 455 | $ 0 | $ 1,563 | $ 284
Troubled Debt Restructurings, Post-Modification | 452 | 0 | 1,534 | 281
Troubled Debt Restructurings That Subsequently Defaulted, Number of Contracts | 0 | 0 | 0 | 2
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment | 0 | 0 | 0 | 114
Commercial [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled Debt Restructurings, Number of Contracts | 0 |  | 1 |
Troubled Debt Restructurings, Pre-Modification | 0 |  | 84 |
Troubled Debt Restructurings, Post-Modification | 0 |  | 81 |
Commercial Construction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled Debt Restructurings, Number of Contracts | 2 |  | 2 |
Troubled Debt Restructurings, Pre-Modification | 229 |  | 229 |
Troubled Debt Restructurings, Post-Modification | 226 |  | 226 |
Troubled Debt Restructurings That Subsequently Defaulted, Number of Contracts | 0 | 0 | 0 | 1
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment | 0 | 0 | 0 | 64
Commercial RE [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled Debt Restructurings, Number of Contracts | 1 | 0 | 1 | 1
Troubled Debt Restructurings, Pre-Modification | 226 | 0 | 226 | 57
Troubled Debt Restructurings, Post-Modification | 226 | 0 | 226 | 57
Residential RE [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled Debt Restructurings, Number of Contracts | 0 | 0 | 2 | 1
Troubled Debt Restructurings, Pre-Modification | 0 | 0 | 1,024 | 227
Troubled Debt Restructurings, Post-Modification | 0 | 0 | 1,001 | 224
Troubled Debt Restructurings That Subsequently Defaulted, Number of Contracts | 0 | 0 | 0 | 1
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment | $ 0 | $ 0 | $ 0 | $ 50

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
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- Definition Amount of investment in financing receivables (after modification) modified by troubled debt restructurings. + References No definition available. + Details
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Namespace Prefix: | cban_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount of investment in financing receivables (before modification) modified by troubled debt restructurings. + References No definition available. + Details
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X
- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References No definition available. + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References No definition available. + Details
Name: | cban_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix: | cban_
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- Details
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