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Note 12 - Regulatory Capital Matters - Summary of Regulatory Capital Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Capital $ 130,512 $ 127,786
Capital to Risk-Weighted Assets 15.88% 15.56%
Capital Required for Capital Adequacy $ 65,747 $ 65,718
Capital Required for Capital Adequacy to Risk-Weighted Assets 8.00% 8.00%
Capital Required to be Well Capitalized  
Capital Required to be Well Capitalized to Risk-Weighted Assets  
Capital Required to be Well Capitalized  
Capital Required to be Well Capitalized to Risk-Weighted Assets  
Tier I Risk Based Capital $ 123,045 $ 120,279
Tier I Risk Based Capital to Risk-Weighted Assets 14.97% 14.64%
Tier I Risk Based Capital Required for Capital Adequacy $ 49,310 $ 49,289
Tier I Risk Based Capital Required for Capital Adequacy to Risk-Weighted Assets 6.00% 6.00%
Tier I Risk Based Capital Required to be Well Capitalized  
Tier I Risk Based Capital Required to be Well Capitalized to Risk-Weighted Assets  
Tier I Risk Based Capital Required to be Well Capitalized  
Tier I Risk Based Capital Required to be Well Capitalized to Risk-Weighted Assets  
Common Equity Tier I Risk Based Capital $ 99,545 $ 96,779
Common Equity Tier I Risk Based Capital to Risk-Weighted Assets 12.11% 11.78%
Common Equity Tier I Risk Based Capital Required for Capital Adequacy $ 36,983 $ 36,967
Common Equity Tier I Risk Based Capital Required for Capital Adequacy to Risk-Weighted Assets 4.50% 4.50%
Common Equity Tier I Risk Based Capital Required to Be Well Capitalized  
Common Equity Tier I Risk Based Capital Required to Be Well Capitalized to Risk-Weighted Assets  
Common Equity Tier I Risk Based Capital Required to Be Well Capitalized to Risk-Weighted Assets  
Tier I Leverage Capital $ 123,045 $ 120,279
Tier I Leverage Capital to Average Assets 10.14% 9.89%
Tier I Leverage Capital Required for Capital Adequacy $ 48,517 $ 48,635
Tier I Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Tier I Leverage Capital Required to Be Well Capitalized  
Colony Bank [Member]    
Capital $ 128,965 $ 127,470
Capital to Risk-Weighted Assets 15.72% 15.54%
Capital Required for Capital Adequacy $ 65,648 $ 65,628
Capital Required for Capital Adequacy to Risk-Weighted Assets 8.00% 8.00%
Capital Required to be Well Capitalized $ 82,060 $ 82,036
Capital Required to be Well Capitalized to Risk-Weighted Assets 10.00% 10.00%
Capital Required to be Well Capitalized $ 82,060 $ 82,036
Capital Required to be Well Capitalized to Risk-Weighted Assets 10.00% 10.00%
Tier I Risk Based Capital $ 121,498 $ 119,963
Tier I Risk Based Capital to Risk-Weighted Assets 14.81% 14.62%
Tier I Risk Based Capital Required for Capital Adequacy $ 49,236 $ 49,221
Tier I Risk Based Capital Required for Capital Adequacy to Risk-Weighted Assets 6.00% 6.00%
Tier I Risk Based Capital Required to be Well Capitalized $ 65,648 $ 65,628
Tier I Risk Based Capital Required to be Well Capitalized to Risk-Weighted Assets 8.00% 8.00%
Tier I Risk Based Capital Required to be Well Capitalized $ 65,648 $ 65,628
Tier I Risk Based Capital Required to be Well Capitalized to Risk-Weighted Assets 8.00% 8.00%
Common Equity Tier I Risk Based Capital $ 121,498 $ 119,963
Common Equity Tier I Risk Based Capital to Risk-Weighted Assets 14.81% 14.62%
Common Equity Tier I Risk Based Capital Required for Capital Adequacy $ 36,927 $ 36,916
Common Equity Tier I Risk Based Capital Required for Capital Adequacy to Risk-Weighted Assets 4.50% 4.50%
Common Equity Tier I Risk Based Capital Required to Be Well Capitalized to Risk-Weighted Assets 6.50% 6.50%
Common Equity Tier I Risk Based Capital Required to Be Well Capitalized $ 53,339 $ 53,323
Common Equity Tier I Risk Based Capital Required to Be Well Capitalized to Risk-Weighted Assets 6.50% 6.50%
Tier I Leverage Capital $ 121,498 $ 119,963
Tier I Leverage Capital to Average Assets 10.03% 9.88%
Tier I Leverage Capital Required for Capital Adequacy $ 48,442 $ 48,566
Tier I Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Tier I Leverage Capital Required to Be Well Capitalized $ 60,553 $ 60,708
Tier I Leverage Capital Required to Be Well Capitalized to Average Assets 5.00% 5.00%