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Capital Ratios (Schedule Of The Total Risk-based, Tier 1 Risk-based And Tier 1 Leverage Requirements) (Details)
Jun. 30, 2015
Dec. 31, 2014
Franklin Financial Service Corporation [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Risk-based Capital Ratio: Ratio [1] 14.48%  
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum [1] 4.50%  
Tier 1 Risk-based Capital Ratio: Ratio [2] 14.48% 14.19%
Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum [2] 6.00%  
Total Risk-based Capital Ratio: Ratio [3] 15.73% 15.49%
Total Risk-based Capital Ratio: Adequately Capitalized Minimum [3] 8.00%  
Tier 1 Leverage Ratio: Ratio [4] 10.17% 9.69%
Tier 1 Leverage Ratio: Adequately Capitalized Minimum [4] 4.00%  
Farmers & Merchants Trust Company [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Risk-based Capital Ratio: Ratio [1] 14.39%  
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum [1] 4.50%  
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum [1] 6.50%  
Tier 1 Risk-based Capital Ratio: Ratio [2] 14.39% 13.96%
Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum [2] 6.00%  
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum [2] 8.00%  
Total Risk-based Capital Ratio: Ratio [3] 15.64% 15.26%
Total Risk-based Capital Ratio: Adequately Capitalized Minimum [3] 8.00%  
Total Risk-based Capital Ratio: Well Capitalized Minimum [3] 10.00%  
Tier 1 Leverage Ratio: Ratio [4] 9.96% 9.55%
Tier 1 Leverage Ratio: Adequately Capitalized Minimum [4] 4.00%  
Tier 1 Leverage Ratio: Well Capitalized Minimum 5.00% [4] 6.00%
[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