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Capital Ratios (Schedule Of The Total Risk-based, Tier 1 Risk-based And Tier 1 Leverage Requirements) (Details) | Mar. 31, 2025 | Dec. 31, 2024
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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 | 0.1086 | 0.1131
Tier 1 Risk-based Capital Ratio: Ratio | 0.1086 | 0.1131
Total Risk-based Capital Ratio: Ratio | 0.1330 | 0.1385
Tier 1 Leverage Ratio: Ratio | 0.0782 | 0.0792
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier 1 Risk-based Capital Ratio: Ratio | 0.1144 | 0.1171
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio | 0.0450 |
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | 0.065 |
Tier 1 Risk-based Capital Ratio: Ratio | 0.1144 | 0.1171
Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio | 0.0600 |
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | 0.08 |
Total Risk-based Capital Ratio: Ratio | 0.1269 | 0.1296
Total Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio | 0.0800 |
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | 0.10 |
Tier 1 Leverage Ratio: Ratio | 0.0824 | 0.0820
Tier 1 Leverage Ratio: Adequately Capitalized Minimum: Ratio | 0.0400 |
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio | 0.05 |

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