Annual report pursuant to Section 13 and 15(d)

REGULATORY MATTERS 2 (Details)

v3.8.0.1
REGULATORY MATTERS 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Banking and Thrift [Abstract]    
Description of Factors that May Affect Capital Adequacy The capital conservation buffer is being phased in as follows: 1.25% in 2017, 1.875% in 2018, and 2.50% in 2019.  
Capital City Bank Group [Member]    
Actual [Abstract]    
Common Equity Tier 1 $ 234,477 $ 220,211
Tier I capital to total average assets 285,477 270,801
Capital 298,784 284,232
Tier 1 leverage $ 285,477 $ 270,801
Common Equity Tier 1, percent 13.42% 12.61%
Tier 1 Based Capital, percent 16.33% 15.51%
Total Capital, percent 17.10% 16.28%
Tier 1 Leverage, percent 10.47% 10.23%
Required for Capital Adequacy Purposes [Abstract]    
Common Equity Tier 1, Required for Capital $ 78,648 $ 78,587
Tier I Capital, Requied for Capital 104,864 104,783
Total Capital, Requied for Capital 139,819 139,710
Tier 1 Leverage, Required for Capital $ 109,082 $ 105,909
Common Equity Tier 1, Required for Capital, percent 4.50% 4.50%
Tier 1 Capital, Required for Capital, percent 6.00% 6.00%
Total Capital, Required for Capital, percent 8.00% 8.00%
Tier I Leverage, Required for Capital, percent 4.00% 4.00%
Capital City Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Statutory Amount Available for Dividend Payments without Regulatory Approval $ 3,400  
Actual [Abstract]    
Common Equity Tier 1 275,796 $ 268,811
Tier I capital to total average assets 275,796 268,811
Capital 289,103 282,242
Tier 1 leverage $ 275,796 $ 268,811
Common Equity Tier 1, percent 15.83% 15.44%
Tier 1 Based Capital, percent 15.83% 15.44%
Total Capital, percent 16.59% 16.21%
Tier 1 Leverage, percent 10.14% 10.18%
Required for Capital Adequacy Purposes [Abstract]    
Common Equity Tier 1, Required for Capital $ 78,418 $ 78,356
Tier I Capital, Requied for Capital 104,557 104,475
Total Capital, Requied for Capital 139,410 139,300
Tier 1 Leverage, Required for Capital $ 108,764 $ 105,652
Common Equity Tier 1, Required for Capital, percent 4.50% 4.50%
Tier 1 Capital, Required for Capital, percent 6.00% 6.00%
Total Capital, Required for Capital, percent 8.00% 8.00%
Tier I Leverage, Required for Capital, percent 4.00% 4.00%
To Be Well Capitialized Under Prompt Corrective Action Provisions [Abstract]    
Common Equity Tier 1, Well-Capitialized $ 113,270 $ 113,182
Tier 1 Capital, Well-Capitalized 139,410 139,300
Total Capital, Well-Capitalized 174,262 174,126
Tier 1 Leverage, Well-Capitalized $ 135,956 $ 132,066
Common Equity Tier 1, Well-Capitalized, percent 6.50% 6.50%
Tier 1 Capital, Well-Capitalized, percent 8.00% 8.00%
Total Capital, Well-Capitalized, percent 10.00% 10.00%
Tier 1 Leverage, Well-Capitalized, percent 5.00% 5.00%