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Regulatory Capital Matters - Summary of Regulatory Capital Information (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Total Capital to Risk-Weighted Assets    
Actual Amount $ 201,537 $ 155,447
Actual Ratio 0.1280 0.1378
For Capital Adequacy Purposes, Amount $ 125,961 $ 90,245
For Capital Adequacy Purposes, Ratio 0.0800 0.0800
Tier 1 Capital to Risk-Weighted Assets    
Actual Amount $ 188,660 $ 143,320
Actual Ratio 0.1198 0.1271
For Capital Adequacy Purposes, Amount $ 94,487 $ 67,657
For Capital Adequacy Purposes, Ratio 0.0600 0.0600
Common Equity Tier 1 Capital to Risk-Weighted Assets    
Actual Amount $ 165,160 $ 119,820
Actual Ratio 0.1049 0.1062
For Capital Adequacy Purposes, Amount $ 70,850 $ 50,771
For Capital Adequacy Purposes, Ratio 4.50% 4.50%
Tier 1 Capital to Average Assets    
Actual Amount $ 188,660 $ 143,320
Actual Ratio 0.0837 0.0849
For Capital Adequacy Purposes, Amount $ 90,117 $ 67,524
For Capital Adequacy Purposes, Ratio 0.0400 0.0400
Colony Bank    
Total Capital to Risk-Weighted Assets    
Actual Amount $ 199,675 $ 164,050
Actual Ratio 0.1268 0.1455
For Capital Adequacy Purposes, Amount $ 125,938 $ 90,199
For Capital Adequacy Purposes, Ratio 0.0800 0.0800
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 157,423 $ 112,749
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.1000 0.1000
Tier 1 Capital to Risk-Weighted Assets    
Actual Amount $ 186,798 $ 151,923
Actual Ratio 0.1187 0.1348
For Capital Adequacy Purposes, Amount $ 94,454 $ 67,622
For Capital Adequacy Purposes, Ratio 0.0600 0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 125,938 $ 90,162
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.0800 0.0800
Common Equity Tier 1 Capital to Risk-Weighted Assets    
Actual Amount $ 186,798 $ 151,923
Actual Ratio 0.1187 0.1348
For Capital Adequacy Purposes, Amount $ 70,840 $ 50,716
For Capital Adequacy Purposes, Ratio 4.50% 4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 102,325 $ 73,257
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 6.50% 6.50%
Tier 1 Capital to Average Assets    
Actual Amount $ 186,798 $ 151,923
Actual Ratio 0.0855 0.0912
For Capital Adequacy Purposes, Amount $ 87,422 $ 66,633
For Capital Adequacy Purposes, Ratio 0.0400 0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 109,277 $ 83,291
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.0500 0.0500