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Capital Ratios (Schedule Of The Total Risk-based, Tier 1 Risk-based And Tier 1 Leverage Requirements) (Details) | Mar. 31, 2024 | Dec. 31, 2023
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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 | 0.1191 | 0.1182
Tier 1 Risk-based Capital Ratio: Ratio | 0.1191 | 0.1182
Total Risk-based Capital Ratio: Ratio | 0.1453 | 0.1445
Tier 1 Leverage Ratio: Ratio | 0.0832 | 0.0901
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier 1 Risk-based Capital Ratio: Ratio | 0.1252 | 0.1238
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 | 0.1252 | 0.1238
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 | 0.1377 | 0.1363
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 | 0.0874 | 0.0944
Tier 1 Leverage Ratio: Adequately Capitalized Minimum: Ratio | 0.0400 |
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio | 0.05 |

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