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Capital Ratios (Schedule Of The Total Risk-based, Tier 1 Risk-based And Tier 1 Leverage Requirements) (Details)	Mar. 31, 2020	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-based Capital Ratio: Ratio	15.78%
Franklin Financial Services Corporation [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Risk-based Capital Ratio: Ratio	14.73%	14.82%
Tier 1 Risk-based Capital Ratio: Ratio	14.73%	14.82%
Total Risk-based Capital Ratio: Ratio	15.99%	16.08%
Tier 1 Leverage Ratio: Ratio	9.85%	9.72%
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Risk-based Capital Ratio: Ratio	14.52%	14.62%
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio	4.50%
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio	6.50%
Tier 1 Risk-based Capital Ratio: Ratio	14.52%	14.62%
Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio	6.00%
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio	8.00%
Total Risk-based Capital Ratio: Ratio	15.78%	15.87%
Total Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio	8.00%
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio	10.00%
Tier 1 Leverage Ratio: Ratio	9.71%	9.59%
Tier 1 Leverage Ratio: Adequately Capitalized Minimum: Ratio	4.00%
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio	5.00%

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