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Regulatory Capital Markets - Summary of Regulatory Capital Information (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Total Capital to Risk-Weighted Assets    
Actual Amount $ 155,447 $ 140,973
Actual Ratio 0.1378 0.1317
For Capital Adequacy Purposes, Amount $ 90,245 $ 85,661
For Capital Adequacy Purposes, Ratio 0.0800 0.0800
Tier I Capital to Risk-Weighted Assets    
Actual Amount $ 143,320 $ 134,110
Actual Ratio 0.1271 0.1252
For Capital Adequacy Purposes, Amount $ 67,657 $ 64,246
For Capital Adequacy Purposes, Ratio 0.0600 0.0600
Common Equity Tier 1 Capital to Risk-Weighted Assets    
Actual Amount $ 119,820 $ 110,610
Actual Ratio 0.1062 0.1033
For Capital Adequacy Purposes, Amount $ 50,771 $ 48,185
For Capital Adequacy Purposes, Ratio 4.50% 4.50%
Tier I Capital to Average Assets    
Actual Amount $ 143,320 $ 134,110
Actual Ratio 0.0849 0.0892
For Capital Adequacy Purposes, Amount $ 67,524 $ 60,141
For Capital Adequacy Purposes, Ratio 0.0400 0.0400
Colony Bank    
Total Capital to Risk-Weighted Assets    
Actual Amount $ 164,050 $ 151,444
Actual Ratio 0.1455 0.1419
For Capital Adequacy Purposes, Amount $ 90,199 $ 85,407
For Capital Adequacy Purposes, Ratio 0.0800 0.0800
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 112,749 $ 106,758
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.1000 0.1000
Tier I Capital to Risk-Weighted Assets    
Actual Amount $ 151,923 $ 144,581
Actual Ratio 0.1348 0.1354
For Capital Adequacy Purposes, Amount $ 67,622 $ 64,055
For Capital Adequacy Purposes, Ratio 0.0600 0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 90,162 $ 85,407
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 $ 151,923 $ 144,581
Actual Ratio 0.1348 0.1354
For Capital Adequacy Purposes, Amount $ 50,716 $ 48,041
For Capital Adequacy Purposes, Ratio 4.50% 4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 73,257 $ 69,393
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 6.50% 6.50%
Tier I Capital to Average Assets    
Actual Amount $ 151,923 $ 144,581
Actual Ratio 0.0912 0.0977
For Capital Adequacy Purposes, Amount $ 66,633 $ 59,977
For Capital Adequacy Purposes, Ratio 0.0400 0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 83,291 $ 74,972
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.0500 0.0500