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Parent Company (Franklin Financial Services Corporation) Financial Information (Statements Of Cash Flows) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items] |  |
Net income | $ 19,616 | $ 12,800
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock option compensation | 204 | 197
Deferred tax expense (benefit) | 90 | (839)
Net cash provided by operating activities | 26,349 | 6,435
Dividends paid | (5,524) | (5,226)
Cash received from option exercises | 135 | 36
Treasury stock purchase | (1,193) | (1,171)
Net cash provided by financing activities | 225,592 | 244,197
(Decrease) increase in cash and cash equivalents | 118,003 | (26,682)
Cash and cash equivalents as of January 1 | 57,146 | 83,828
Cash and cash equivalents as of December 31 | 175,149 | 57,146
Franklin Financial Services Corporation [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | 19,616 | 12,800
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Equity in undistributed loss (income) of subsidiary | (17,534) | (7,702)
Stock option compensation | 204 | 197
Change in fair value of equity security | (90) | (49)
Increase in other assets/liabilities | (474) | (317)
Net cash provided by operating activities | 1,722 | 4,929
Dividends paid | (5,524) | (5,226)
Proceeds from subordinated notes, net of issuance costs |  | 19,541
Cash received from option exercises | 135 | 36
Common stock issued under dividend reinvestment plan | 2,388 | 1,836
Treasury stock purchase | (1,193) | (1,171)
Net cash provided by financing activities | (4,194) | 15,016
(Decrease) increase in cash and cash equivalents | (2,472) | 19,945
Cash and cash equivalents as of January 1 | 20,109 | 164
Cash and cash equivalents as of December 31 | $ 17,637 | $ 20,109

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