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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 | Dec. 31, 2020 | Dec. 31, 2019
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Adjustments to reflect liabilities acquired at fair value [Abstract] |  |  |
Goodwill resulting from merger |  | $ 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 MidCoast 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 |  |

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