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Capital Ratios (Schedule Of The Total Risk-based, Tier 1 Risk-based And Tier 1 Leverage Requirements) (Details)
Sep. 30, 2017
Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Risk-based Capital Ratio: Ratio 16.89%  
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] 15.62% 14.41%
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [1] 4.50%  
Tier 1 Risk-based Capital Ratio: Ratio [2] 15.62% 14.41%
Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [2] 6.00%  
Total Risk-based Capital Ratio: Ratio [3] 16.89% 15.67%
Total Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio [3] 8.00%  
Tier 1 Leverage Ratio: Ratio [4] 10.39% 10.11%
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] 15.56% 14.29%
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] 15.56% 14.29%
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] 16.82% 15.55%
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] 10.34% 10.02%
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