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Acquisition of MidCoast Community Bancorp, Inc, Summarizes The Purchase of Midcoast (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | Apr. 17, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Adjustments to reflect liabilities acquired at fair value [Abstract] |  |  |  |
Goodwill resulting from merger | [1] |  | $ 31,376 | $ 23,296
MidCoast Community Bancorp, Inc [Member] |  |  |  |
Purchase Price Consideration in Common Stock [Abstract] |  |  |  |
Citizens Financial Services, Inc. shares issued (in shares) |  | 373,356 |  |
Value assigned to Citizens Financial Services, Inc. common share (in dollars per share) |  | $ 51.50 |  |
Purchase price assigned to MidCoast common shares exchanged for Citizens Financial Services, Inc. |  | $ 19,228 |  |
Purchase Price Consideration - Cash for Common Stock [Abstract] |  |  |  |
Purchase price assigned to The First National Bank of Fredericksburg common shares exchanged for cash |  | 7,615 |  |
Total Purchase Price |  | 26,843 |  |
Net Assets Acquired [Abstract] |  |  |  |
MidCoast Community Bancorp, Inc shareholders' equity |  | 24,330 |  |
Adjustments to reflect assets acquired at fair value [Abstract] |  |  |  |
Investments |  |  |  |
Loans [Abstract] |  |  |  |
Interest rate |  | 1,424 |  |
General credit |  | (4,375) |  |
Specific credit - non-amortizing |  | (2,135) |  |
Specific credit - amortizing |  | (966) |  |
Core deposit intangible |  | 157 |  |
Owned premises |  | (426) |  |
Other assets |  | 65 |  |
Deferred tax assets |  | 2,217 |  |
Adjustments to reflect liabilities acquired at fair value [Abstract] |  |  |  |
Time deposits |  | (1,018) |  |
Borrowings |  | (497) |  |
Other liabilities |  | (13) |  |
Net assets acquired |  | 18,763 |  |
Goodwill resulting from merger |  | $ 8,080 |  |
[1] | Excludes fully amortized intangible assets

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