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Capital Ratios (Schedule Of The Total Risk-based, Tier 1 Risk-based And Tier 1 Leverage Requirements) (Details) | Sep. 30, 2021 | Dec. 31, 2020
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Franklin Financial Services Corporation [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier 1 Risk-based Capital Ratio: Ratio | 14.91 | 14.32
Tier 1 Risk-based Capital Ratio: Ratio | 14.91 | 14.32
Total Risk-based Capital Ratio: Ratio | 18.16 | 17.69
Tier 1 Leverage Ratio: Ratio | 8.53 | 8.69
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier 1 Risk-based Capital Ratio: Ratio | 14.97 | 14.07
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 | 14.97 | 14.07
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 | 16.23 | 15.33
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 | 8.57 | 8.54
Tier 1 Leverage Ratio: Adequately Capitalized Minimum: Ratio | 4.00 |
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio | 5.00 |

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