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ACQUISITION OF FNB (Details) $ / shares in Units, shares in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 11, 2015 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2015 Branches $ / shares
Adjustments to reflect liabilities acquired at fair value [Abstract] |  |  |  |  |
Goodwill resulting from merger |  | $ 23,296 | $ 21,089 |  |
Merger and acquisition |  | 165 | 0 | $ 1,103 |
Assets (liabilities) acquired [Abstract] |  |  |  |  |
Goodwill resulting from the FNB merger |  | 23,296 | 21,089 |  |
First National Bank of Fredericksburg [Member] |  |  |  |  |
Summarizes the purchase of FNB [Abstract] |  |  |  |  |
Ownership percentage |  |  |  |  | 100.00%
Merger agreement per share in cash and stock (in dollars per share) | $ / shares |  |  |  |  | $ 630
Business acquisition credit impaired loans purchased | $ 3,809 |  |  |  |
Purchase Price Consideration - Cash for Common Stock [Abstract] |  |  |  |  |
Purchase price assigned to The First National Bank of Fredericksburg common shares exchanged for cash | 5,619 |  |  |  |
Total Purchase Price | 21,603 |  |  |  |
Net Assets Acquired [Abstract] |  |  |  |  |
The First National Bank of Fredericksburg shareholders' equity | 12,298 |  |  |  |
Loans [Abstract] |  |  |  |  |
Interest rate | 31 |  |  |  |
General credit | (1,362) |  |  |  |
Specific credit - non-amortizing | (2,495) |  |  |  |
Specific credit - amortizing | (665) |  |  |  |
Core deposit intangible | 1,641 |  |  |  |
Covenant not to compete | 125 |  |  |  |
Premises and equipment | 1,203 |  |  |  |
Leased premises contracts | (359) |  |  |  |
Other assets | (358) |  |  |  |
Deferred tax assets | 785 |  |  |  |
Adjustments to reflect liabilities acquired at fair value [Abstract] |  |  |  |  |
Time deposits | (74) |  |  |  |
Acquired and liabilities assumed, net | 10,770 | (4,399) | 0 | 61,911 |
Goodwill resulting from merger | 10,833 | 2,207 | 0 | 10,833 |
Goodwill and other intangibles | 12,814 |  |  |  |
Merger and acquisition |  |  |  | 1,103 |
Asset acquired and liability assumed [Abstract] |  |  |  |  |
Total Purchase Price | 21,603 |  |  |  |
Assets (liabilities) acquired [Abstract] |  |  |  |  |
Cash and cash equivalents | 83,514 | 154 | 0 | 83,514 |
Interest bearing time deposits with other banks | 1,236 | 0 | 0 | 1,236 |
Securities available for sale | 23,831 | 0 | 0 | 23,831 |
Loans | 115,211 | 39,847 | 0 | 115,211 |
Premises and equipment, net | 4,743 | 86 | 0 | 4,743 |
Accrued interest receivable | 282 | 74 | 0 | 282 |
Bank-owned life insurance | 4,598 | 0 | 0 | 4,598 |
Intangibles | 1,981 | 145 | 0 | 1,981 |
Deferred tax asset | 2,979 | 0 | 0 | 2,979 |
Other assets | 2,332 | 0 | 0 | 2,332 |
Time deposits | (42,675) |  |  |  |
Deposits other than time deposits | (182,555) |  |  |  |
Accrued interest payable | (14) | (29) | 0 | (14) |
Other liabilities | (4,693) | (51) | 0 | (4,693) |
Acquired and liabilities assumed, net | 10,770 | (4,399) | 0 | 61,911 |
Goodwill resulting from the FNB merger | $ 10,833 | $ 2,207 | $ 0 | $ 10,833 |
First National Bank of Fredericksburg [Member] | Lebanon County [Member] |  |  |  |  |
Summarizes the purchase of FNB [Abstract] |  |  |  |  |
Number of Branches | Branches |  |  |  |  | 4
First National Bank of Fredericksburg [Member] | Schuylkill County [Member] |  |  |  |  |
Summarizes the purchase of FNB [Abstract] |  |  |  |  |
Number of Branches | Branches |  |  |  |  | 2
First National Bank of Fredericksburg [Member] | Berks County [Member] |  |  |  |  |
Summarizes the purchase of FNB [Abstract] |  |  |  |  |
Number of Branches | Branches |  |  |  |  | 1
First National Bank of Fredericksburg [Member] | Common Stock [Member] |  |  |  |  |
Purchase Price Consideration in Common Stock [Abstract] |  |  |  |  |
Citizens Financial Services, Inc. shares issued (in shares) | shares | 336,515 |  |  |  |
Value assigned to Citizens Financial Services, Inc. common share (in dollars per share) | $ / shares | $ 47.5 |  |  |  |
Purchase price assigned to FNB common shares exchanged for Citizens Financial Services, Inc. | $ 15,984 |  |  |  |

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