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Regulatory Matters (Schedule Of The Total Risk-based, Tier 1 Risk-based And Tier 1 Leverage Requirements) (Details) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2015
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio |  | 6.50% |  |
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio |  | 8 |  | 6
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio |  | 10 |  |
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio |  | 5 |  |
Franklin Financial Services Corporation [Member] |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Common Equity Tier 1 Risk-based Capital Ratio: Ratio | [1] | 14.32 | 14.82 |
Tier 1 Risk-based Capital Ratio: Ratio | [2] | 14.32 | 14.82 |
Total Risk-based Capital Ratio: Ratio | [3] | 17.69 | 16.08 |
Tier 1 Leverage Ratio: Ratio | [4] | 8.69 | 9.72 |
Common Equity Tier 1 Risk-based Capital Ratio: Amount | [1] | $ 132,970 | $ 124,498 |
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum, Amount | [1] | 41,788 | 37,808 |
Tier 1 Risk-based Capital Ratio: Amount | [2] | 132,970 | 124,498 |
Tier 1 Risk-based Capital Ratio: Minimum to be Adequately Capitalized Amount | [2] | 55,717 | 50,410 |
Total Risk-based Capital Ratio: Amount | [3] | 164,230 | 135,061 |
Total Risk-based Capital Ratio: Minimum to be Adequately Capitalized Amount | [3] | 74,289 | 67,214 |
Tier 1 Leverage Ratio: Amount | [4] | 132,970 | 124,498 |
Tier 1 Leverage Ratio: Minimum to be Adequately Capitalized Amount | [4] | $ 61,191 | $ 51,216 |
Bank [Member] |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Common Equity Tier 1 Risk-based Capital Ratio: Ratio | [1] | 14.07 | 14.62 |
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio | [1] | 4.50 | 4.50 |
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | [1] | 6.50% | 6.50% |
Tier 1 Risk-based Capital Ratio: Ratio | [2] | 14.07 | 14.62 |
Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio | [2] | 6.00 | 6.00 |
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | [2] | 8.00 | 8.00 |
Total Risk-based Capital Ratio: Ratio | [3] | 15.33 | 15.87 |
Total Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio | [3] | 8.00 | 8.00 |
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | [3] | 10.00 | 10.00 |
Tier 1 Leverage Ratio: Ratio | [4] | 8.54 | 9.59 |
Tier 1 Leverage Ratio: Adequately Capitalized Minimum: Ratio | [4] | 4.00 | 4.00 |
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio | [4] | 5.00 | 5.00 |
Common Equity Tier 1 Risk-based Capital Ratio: Amount | [1] | $ 130,678 | $ 122,974 |
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum, Amount | [1] | 41,809 | 37,859 |
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum, Amount | [1] | 60,390 | 54,682 |
Tier 1 Risk-based Capital Ratio: Amount | [2] | 130,678 | 122,974 |
Tier 1 Risk-based Capital Ratio: Minimum to be Adequately Capitalized Amount | [2] | 55,745 | 50,479 |
Tier 1 Risk-based Capital Ratio: Minimum to be Well Capitalized Amount | [2] | 74,326 | 67,305 |
Total Risk-based Capital Ratio: Amount | [3] | 142,384 | 133,537 |
Total Risk-based Capital Ratio: Minimum to be Adequately Capitalized Amount | [3] | 74,326 | 67,305 |
Total Risk-based Capital Ratio: Minimum to be Well Capitalized Amount | [3] | 92,908 | 84,131 |
Tier 1 Leverage Ratio: Amount | [4] | 130,678 | 122,974 |
Tier 1 Leverage Ratio: Minimum to be Adequately Capitalized Amount | [4] | 61,222 | 51,285 |
Tier 1 Leverage Ratio: Minimum to be Well Capitalized Amount | [4] | $ 76,527 | $ 64,107 |
[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

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