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Regulatory Capital Matters (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Ratios [Abstract]    
Tier 1 capital to total average assets (in hundredths) 8.00%  
Total risk-based capital to total risk-weighted assets (in hundredths) 10.00%  
Consolidated [Member]
   
Total Capital to Risk-Weighted Assets [Abstract]    
Actual Amount $ 123,027 $ 122,630
For Capital Adequacy Purposes, Amount 58,374 59,548
Amount [Abstract]    
Actual Amount 113,859 113,283
For Capital Adequacy Purposes, Amount 29,187 29,774
Ratios [Abstract]    
Actual Ratio (in hundredths) 16.86% 16.47%
For Capital Adequacy Purposes, Ratio (in hundredths) 8.00% 8.00%
Actual Ratio (in hundredths) 15.60% 15.22%
For Capital Adequacy Purposes, Ratio (in hundredths) 4.00% 4.00%
Amount [Abstract]    
Actual Amount 113,859 113,283
For Capital Adequacy Purposes, Amount 44,757 44,343
Ratios [Abstract]    
Actual Ratio (in hundredths) 10.18% 10.22%
For Capital Adequacy Purposes, Ratio (in hundredths) 4.00% 4.00%
Colony Bank [Member]
   
Total Capital to Risk-Weighted Assets [Abstract]    
Actual Amount 122,914 123,463
For Capital Adequacy Purposes, Amount 58,290 59,474
To be Well Capitalized Under Prompt Corrective Actions Provisions, Amount 72,864 74,342
Amount [Abstract]    
Actual Amount 113,759 114,128
For Capital Adequacy Purposes, Amount 29,145 29,737
To be Well Capitalized Under Prompt Corrective Actions Provisions, Amount 43,718 44,605
Ratios [Abstract]    
Actual Ratio (in hundredths) 16.87% 16.61%
For Capital Adequacy Purposes, Ratio (in hundredths) 8.00% 8.00%
To be Well Capitalized Under Prompt Corrective Actions Provisions, Ratio (in hundredths) 10.00% 10.00%
Actual Ratio (in hundredths) 15.61% 15.35%
For Capital Adequacy Purposes, Ratio (in hundredths) 4.00% 4.00%
To be Well Capitalized Under Prompt Corrective Actions Provisions, Ratio (in hundredths) 6.00% 6.00%
Amount [Abstract]    
Actual Amount 113,759 114,128
For Capital Adequacy Purposes, Amount 44,689 44,282
To be Well Capitalized Under Prompt Corrective Actions Provisions, Amount $ 55,861 $ 55,352
Ratios [Abstract]    
Actual Ratio (in hundredths) 10.18% 10.31%
For Capital Adequacy Purposes, Ratio (in hundredths) 4.00% 4.00%
To be Well Capitalized Under Prompt Corrective Actions Provisions, Ratio (in hundredths) 5.00% 5.00%