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Regulatory Matters (Schedule Of The Total Risk-based, Tier 1 Risk-based And Tier 1 Leverage Requirements) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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 | [1] | 14.82% | 13.96%
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio | [1] |  | 4.50%
Tier 1 Risk-based Capital Ratio: Ratio | [2] | 14.82% | 13.96%
Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio | [2] |  | 6.00%
Total Risk-based Capital Ratio: Ratio | [3] | 16.08% | 15.21%
Total Risk-based Capital Ratio: Adequately Capitalized Minimum: Ratio | [3] |  | 8.00%
Tier 1 Leverage Ratio: Ratio | [4] | 9.72% | 9.78%
Tier 1 Leverage Ratio: Adequately Capitalized Minimum: Ratio | [4] |  | 4.00%
Common Equity Tier 1 Risk-based Capital Ratio: Amount | [1] | $ 124,498 | $ 115,760
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum, Amount | [1] | 37,808 | 37,328
Tier 1 Risk-based Capital Ratio: Amount | [2] | 124,498 | 115,760
Tier 1 Risk-based Capital Ratio: Minimum to be Adequately Capitalized Amount | [2] | 50,410 | 49,771
Total Risk-based Capital Ratio: Amount | [3] | 135,061 | 126,129
Total Risk-based Capital Ratio: Minimum to be Adequately Capitalized Amount | [3] | 67,214 | 66,361
Tier 1 Leverage Ratio: Amount | [4] | 124,498 | 115,760
Tier 1 Leverage Ratio: Minimum to be Adequately Capitalized Amount | [4] | $ 51,216 | $ 47,323
Bank [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common Equity Tier 1 Risk-based Capital Ratio: Ratio | [1] | 14.62% | 13.80%
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] | 14.62% | 13.80%
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] | 15.87% | 15.06%
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] | 9.59% | 9.68%
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] | $ 122,974 | $ 115,326
Common Equity Tier 1 Risk-based Capital Ratio: Adequately Capitalized Minimum, Amount | [1] | 37,859 | 37,605
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum, Amount | [1] | 54,682 | 54,319
Tier 1 Risk-based Capital Ratio: Amount | [2] | 122,974 | 115,326
Tier 1 Risk-based Capital Ratio: Minimum to be Adequately Capitalized Amount | [2] | 50,479 | 50,140
Tier 1 Risk-based Capital Ratio: Minimum to be Well Capitalized Amount | [2] | 67,305 | 66,854
Total Risk-based Capital Ratio: Amount | [3] | 133,537 | 125,825
Total Risk-based Capital Ratio: Minimum to be Adequately Capitalized Amount | [3] | 67,305 | 66,854
Total Risk-based Capital Ratio: Minimum to be Well Capitalized Amount | [3] | 84,131 | 83,567
Tier 1 Leverage Ratio: Amount | [4] | 122,974 | 115,326
Tier 1 Leverage Ratio: Minimum to be Adequately Capitalized Amount | [4] | 51,285 | 47,675
Tier 1 Leverage Ratio: Minimum to be Well Capitalized Amount | [4] | $ 64,107 | $ 59,593
[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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