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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
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