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Capital Ratios (Schedule Of The Total Risk-based, Tier 1 Risk-based And Tier 1 Leverage Requirements) (Details)
Mar. 31, 2018
Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Risk-based Capital Ratio: Ratio 15.55%  
Franklin Financial Services Corporation [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Risk-based Capital Ratio: Ratio [1] 14.30% 14.06%
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [1] 4.50%  
Tier 1 Risk-based Capital Ratio: Ratio [2] 14.30% 14.06%
Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [2] 6.00%  
Total Risk-based Capital Ratio: Ratio [3] 15.55% 15.31%
Total Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [3] 8.00%  
Tier 1 Leverage Ratio: Ratio [4] 9.95% 9.73%
Tier 1 Leverage Ratio: Adequately Capitalized Minimum: Ratio [4] 4.00%  
Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Risk-based Capital Ratio: Ratio [1] 14.16% 13.93%
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [1] 4.50%  
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio [1] 6.50%  
Tier 1 Risk-based Capital Ratio: Ratio [2] 14.16% 13.93%
Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [2] 6.00%  
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio 8.00% [2] 6.00%
Total Risk-based Capital Ratio: Ratio [3] 15.41% 15.19%
Total Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [3] 8.00%  
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio [3] 10.00%  
Tier 1 Leverage Ratio: Ratio [4] 9.86% 9.64%
Tier 1 Leverage Ratio: Adequately Capitalized Minimum: Ratio [4] 4.00%  
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio [4] 5.00%  
[1] Common equity Tier 1 capital/ total risk-weighted assets
[2] Tier 1 capital / total risk-weighted assets
[3] Total risk-based capital / total risk-weighted assets
[4] Tier 1 capital / average quarterly assets