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Capital Ratios (Schedule Of The Total Risk-based, Tier 1 Risk-based And Tier 1 Leverage Requirements) (Details)
Jun. 30, 2016
Dec. 31, 2015
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] 14.64% 14.77%
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [1] 5.125%  
Tier 1 Risk-based Capital Ratio: Ratio [2] 14.64% 14.77%
Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [2] 6.625%  
Total Risk-based Capital Ratio: Ratio [3] 15.90% 16.03%
Total Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [3] 8.625%  
Tier 1 Leverage Ratio: Ratio [4] 10.20% 10.38%
Tier 1 Leverage Ratio: Adequately Capitalized Minimum: Ratio [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] 14.59% 14.76%
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [1] 5.125%  
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio [1] 6.50%  
Tier 1 Risk-based Capital Ratio: Ratio [2] 14.59% 14.76%
Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [2] 6.625%  
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio 8.00% [2] 6.00%
Total Risk-based Capital Ratio: Ratio [3] 15.85% 16.02%
Total Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [3] 8.625%  
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio [3] 10.00%  
Tier 1 Leverage Ratio: Ratio [4] 10.17% 10.37%
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