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Regulatory Capital Matters (Tables)
 3 Months Ended
Mar. 31, 2021
Banking And Thrift Disclosure [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations The following table summarizes regulatory capital information as of March 31, 2021 and December 31, 2020 on a consolidated basis and for the subsidiary, as defined.  Regulatory capital ratios for March 31, 2021 and December 31, 2020
were calculated in accordance with the Basel III rules.
(dollars in thousands)ActualFor Capital
Adequacy Purposes		To Be Well
Capitalized Under
Prompt Corrective
Action Provisions
AmountRatioAmountRatioAmountRatio
As of March 31, 2021
Total Capital to Risk-Weighted Assets
Consolidated$159,767 13.76 %$92,888 8.00 %N/AN/A
Colony Bank163,639 13.81 94,794 8.00 $118,493 10.00 %
Tier I Capital to Risk-Weighted Assets
Consolidated147,074 12.49 70,652 6.00 N/AN/A
Colony Bank150,946 12.74 71,089 6.00 94,786 8.00 
Common Equity Tier I Capital to Risk-Weighted Assets
Consolidated123,574 10.49 53,011 4.50 N/AN/A
Colony Bank150,946 12.74 53,317 4.50 77,013 6.50 
Tier I Capital to Average Assets
Consolidated147,074 8.70 67,620 4.00 N/AN/A
Colony Bank150,946 9.05 66,716 4.00 83,396 5.00 
(dollars in thousands)ActualFor Capital
Adequacy Purposes		To Be Well
Capitalized Under
Prompt Corrective
Action Provisions
AmountRatioAmountRatioAmountRatio
As of December 31, 2020
Total Capital to Risk-Weighted Assets
Consolidated$155,447 13.78 %$90,245 8.00 %N/AN/A
Colony Bank164,050 14.55 90,199 8.00 $112,749 10.00 %
Tier I Capital to Risk-Weighted Assets
Consolidated143,320 12.71 67,657 6.00 N/AN/A
Colony Bank151,923 13.48 67,622 6.00 90,162 8.00 
Common Equity Tier I Capital to Risk-Weighted Assets
Consolidated119,820 10.62 50,771 4.50 N/AN/A
Colony Bank151,923 13.48 50,716 4.50 73,257 6.50 
Tier I Capital to Average Assets
Consolidated143,320 8.49 67,524 4.00 N/AN/A
Colony Bank151,923 9.12 66,633 4.00 83,291 5.00