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Note 12 - Regulatory Capital Matters - Summary of Regulatory Capital Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Capital $ 123,052 $ 130,785
Capital to Risk-Weighted Assets 15.39% 16.64%
Capital Required for Capital Adequacy $ 63,981 $ 62,880
Capital Required for Capital Adequacy to Risk-Weighted Assets 8.00% 8.00%
Tier I Risk Based Capital $ 114,188 $ 121,862
Tier I Risk Based Capital to Risk-Weighted Assets 14.28% 15.50%
Tier I Risk Based Capital Required for Capital Adequacy $ 47,986 $ 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 $ 90,688 $ 89,002
Common Equity Tier I Risk Based Capital to Risk-Weighted Assets 11.34% 11.32%
Common Equity Tier I Risk Based Capital Required for Capital Adequacy $ 35,989 $ 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 $ 114,188 $ 121,862
Tier I Leverage Capital to Average Assets 9.47% 10.29%
Tier I Leverage Capital Required for Capital Adequacy $ 48,229 $ 47,368
Tier I Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Colony Bank [Member]    
Capital $ 125,211 $ 127,646
Capital to Risk-Weighted Assets 15.68% 16.26%
Capital Required for Capital Adequacy $ 63,894 $ 62,796
Capital Required for Capital Adequacy to Risk-Weighted Assets 8.00% 8.00%
Capital Required to be Well Capitalized $ 79,867 $ 78,495
Capital Requited to be Well Capitalized to Risk-Weighted Assets 10.00% 10.00%
Tier I Risk Based Capital $ 116,347 $ 118,723
Tier I Risk Based Capital to Risk-Weighted Assets 14.57% 15.12%
Tier I Risk Based Capital Required for Capital Adequacy $ 47,920 $ 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 $ 63,894 $ 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 $ 116,347 $ 118,723
Common Equity Tier I Risk Based Capital to Risk-Weighted Assets 14.57% 15.12%
Common Equity Tier I Risk Based Capital Required for Capital Adequacy $ 35,940 $ 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 $ 51,914 $ 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 $ 116,347 $ 118,723
Tier I Leverage Capital to Average Assets 9.66% 10.04%
Tier I Leverage Capital Required for Capital Adequacy $ 48,161 $ 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 $ 60,201 $ 59,113
Tier I Leverage Capital Required to Be Well Capitalized to Average Assets 5.00% 5.00%