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Note 12 - Regulatory Capital Matters - Summary of Regulatory Capital Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Capital $ 135,451 $ 133,900
Capital to Risk-Weighted Assets 16.09% 15.86%
Capital Required for Capital Adequacy $ 67,341 $ 67,527
Capital Required for Capital Adequacy to Risk-Weighted Assets 8.00% 8.00%
Tier I Risk Based Capital $ 128,862 $ 126,623
Tier I Risk Based Capital to Risk-Weighted Assets 15.31% 15.00%
Tier I Risk Based Capital Required for Capital Adequacy $ 50,505 $ 50,645
Tier I Risk Based Capital Required for Capital Adequacy to Risk-Weighted Assets 6.00% 6.00%
Common Equity Tier I Risk Based Capital $ 105,362 $ 103,123
Common Equity Tier I Risk Based Capital to Risk-Weighted Assets 12.52% 12.22%
Common Equity Tier I Risk Based Capital Required for Capital Adequacy $ 37,879 $ 37,984
Common Equity Tier I Risk Based Capital Required for Capital Adequacy to Risk-Weighted Assets 4.50% 4.50%
Tier I Leverage Capital $ 128,862 $ 126,623
Tier I Leverage Capital to Average Assets 10.18% 10.24%
Tier I Leverage Capital Required for Capital Adequacy $ 50,637 $ 49,478
Tier I Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Colony Bank [Member]    
Capital $ 132,664 $ 131,723
Capital to Risk-Weighted Assets 15.78% 15.63%
Capital Required for Capital Adequacy $ 67,237 $ 67,418
Capital Required for Capital Adequacy to Risk-Weighted Assets 8.00% 8.00%
Capital Required to be Well Capitalized $ 84,047 $ 84,272
Capital Required to be Well Capitalized to Risk-Weighted Assets 10.00% 10.00%
Tier I Risk Based Capital $ 126,075 $ 124,446
Tier I Risk Based Capital to Risk-Weighted Assets 15.00% 14.77%
Tier I Risk Based Capital Required for Capital Adequacy $ 50,428 $ 50,563
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 $ 67,237 $ 67,418
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 $ 126,075 $ 124,446
Common Equity Tier I Risk Based Capital to Risk-Weighted Assets 15.00% 14.77%
Common Equity Tier I Risk Based Capital Required for Capital Adequacy $ 37,821 $ 37,923
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 $ 54,630 $ 54,777
Common Equity Tier I Risk Based Capital Required to Be Well Capitalized to Risk-Weighted Assets 6.50% 6.50%
Tier I Leverage Capital $ 126,075 $ 124,446
Tier I Leverage Capital to Average Assets 9.97% 10.08%
Tier I Leverage Capital Required for Capital Adequacy $ 50,557 $ 49,396
Tier I Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Tier I Leverage Capital Required to Be Well Capitalized $ 63,196 $ 61,745
Tier I Leverage Capital Required to Be Well Capitalized to Average Assets 5.00% 5.00%