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ACQUISITION OF HV BANCORP, INC, Summary of Purchase of HVB Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands | Jun. 16, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Apr. 17, 2020
--- | --- | --- | --- | ---
Fair Value of Liabilities Assumed [Abstract] |  |  |  |
Goodwill |  | $ 85,758 | $ 31,376 |
HV Bancorp, Inc. [Member] |  |  |  |
Purchase Price Consideration in Common Stock [Abstract] |  |  |  |
Citizens Financial Services, Inc. shares issued (in shares) | 693,858 |  |  |
Value assigned to Citizens Financial Services, Inc. common share (in dollars per share) | $ 86.67 |  |  |
Purchase price assigned to HVBC common shares exchanged for Citizens Financial Services, Inc. | $ 60,137 |  |  |
Purchase Price Consideration - Cash for Common Stock [Abstract] |  |  |  |
Purchase price assigned to HVBC's common shares exchanged for cash | 13,112 |  |  |
Purchase Price Related to Cash Payout of Stock Options | 3,416 |  |  |
Total Purchase Price | 76,665 |  |  |
Net Assets Acquired [Abstract] |  |  |  |
HV Bancorp, Inc shareholders' equity | 40,630 |  |  |
Adjustments to Reflect Assets Acquired at Fair Value [Abstract] |  |  |  |
Investments | 31 |  |  |
Loans [Abstract] |  |  |  |
Interest rate | (24,097) |  |  |
General credit | (1,834) |  |  |
Specific credit - PCD accrual | (277) |  |  |
Specific credit - PCD non-accrual | (1,765) |  |  |
Core deposit intangible | 2,770 |  |  |
Owned premises | 67 |  |  |
Other assets | (193) |  |  |
Deferred tax assets | 3,051 |  |  |
Fair Value of Liabilities Assumed [Abstract] |  |  |  |
Time deposits | 586 |  |  |
Borrowings | 3,017 |  |  |
Other liabilities | 297 |  |  |
Total fair value of identifiable net assets | 22,283 |  |  |
Goodwill | $ 54,382 | $ 54,382 | $ 0 | $ 0

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