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Note 12 - Regulatory Capital Matters - Summary of Regulatory Capital Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Capital $ 126,812 $ 130,785
Capital to Risk-Weighted Assets 15.75% 16.64%
Capital Required for Capital Adequacy $ 64,398 $ 62,880
Capital Required for Capital Adequacy to Risk-Weighted Assets 8.00% 8.00%
Tier I Risk Based Capital $ 118,835 $ 121,862
Tier I Risk Based Capital to Risk-Weighted Assets 14.76% 15.50%
Tier I Risk Based Capital Required for Capital Adequacy $ 48,299 $ 47,160
Tier I Risk Based Capital Required for Capital Adequacy to Risk-Weighted Assets 6.00% 6.00%
Common Equity Tier I Risk Based Capital $ 95,335 $ 89,002
Common Equity Tier I Risk Based Capital to Risk-Weighted Assets 11.84% 11.32%
Common Equity Tier I Risk Based Capital Required for Capital Adequacy $ 36,224 $ 35,370
Common Equity Tier I Risk Based Capital Required for Capital Adequacy to Risk-Weighted Assets 4.50% 4.50%
Tier I Leverage Capital $ 118,835 $ 121,862
Tier I Leverage Capital to Average Assets 9.91% 10.29%
Tier I Leverage Capital Required for Capital Adequacy $ 47,978 $ 47,368
Tier I Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Colony Bank [Member]    
Capital $ 129,973 $ 127,646
Capital to Risk-Weighted Assets 16.17% 16.26%
Capital Required for Capital Adequacy $ 64,312 $ 62,796
Capital Required for Capital Adequacy to Risk-Weighted Assets 8.00% 8.00%
Capital Required to be Well Capitalized $ 80,390 $ 78,495
Capital Required to be Well Capitalized to Risk-Weighted Assets 10.00% 10.00%
Tier I Risk Based Capital $ 121,996 $ 118,723
Tier I Risk Based Capital to Risk-Weighted Assets 15.18% 15.12%
Tier I Risk Based Capital Required for Capital Adequacy $ 48,234 $ 47,097
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 $ 64,312 $ 62,796
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 $ 121,996 $ 118,723
Common Equity Tier I Risk Based Capital to Risk-Weighted Assets 15.18% 15.12%
Common Equity Tier I Risk Based Capital Required for Capital Adequacy $ 36,175 $ 35,323
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 $ 52,253 $ 51,022
Common Equity Tier I Risk Based Capital Required to Be Well Capitalized to Risk-Weighted Assets 6.50% 6.50%
Tier I Leverage Capital $ 121,996 $ 118,723
Tier I Leverage Capital to Average Assets 10.19% 10.04%
Tier I Leverage Capital Required for Capital Adequacy $ 47,906 $ 47,290
Tier I Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Tier I Leverage Capital Required to Be Well Capitalized $ 59,882 $ 59,113
Tier I Leverage Capital Required to Be Well Capitalized to Average Assets 5.00% 5.00%