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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, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2015 Branches $ / shares
Adjustments to reflect liabilities acquired at fair value: [Abstract] |  |  |  |  |  |
Goodwill resulting from merger | [1] |  | $ 21,089 | $ 21,089 |  |
Merger and acquisition |  |  | 0 | 1,103 | $ 237 |
Assets (liabilities) acquired [Abstract] |  |  |  |  |  |
Goodwill resulting from the FNB merger | [1] |  | 21,089 | 21,089 |  |
First National Bank of Fredericksburg [Member] |  |  |  |  |  |
Summarizes the purchase of FNB [Abstract] |  |  |  |  |  |
Merger agreement per share in cash and stock (in dollars per share) | $ / shares |  |  |  |  |  | $ 630
Ownership percentage |  |  |  |  |  | 100.00%
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 |  |  |  |
Goodwill resulting from merger |  | 10,833 | 0 | 10,833 | 0 |
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 | 0 | 83,514 | 0 |
Interest bearing time deposits with other banks |  | 1,236 | 0 | 1,236 | 0 |
Securities available for sale |  | 23,831 | 0 | 23,831 | 0 |
Loans |  | 115,211 | 0 | 115,211 | 0 |
Premises and equipment, net |  | 4,743 | 0 | 4,743 | 0 |
Accrued interest receivable |  | 282 | 0 | 282 | 0 |
Bank-owned life insurance |  | 4,598 | 0 | 4,598 | 0 |
Intangibles |  | 1,981 | 0 | 1,981 | 0 |
Deferred tax asset |  | 2,979 | 0 | 2,979 | 0 |
Other assets |  | 2,332 | 0 | 2,332 | 0 |
Time deposits |  | (42,675) |  |  |  |
Deposits other than time deposits |  | (182,555) |  |  |  |
Accrued interest payable |  | (14) | 0 | (14) | 0 |
Other liabilities |  | (4,693) | 0 | (4,693) | 0 |
Acquired and liabilities assumed, net |  | 10,770 |  |  |  |
Goodwill resulting from the FNB merger |  | $ 10,833 | $ 0 | $ 10,833 | $ 0 |
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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