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ACQUISITION OF FNB (Details) $ / shares in Units, shares in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 11, 2015 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) Branches $ / shares | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2013 USD ($)
Adjustments to reflect liabilities acquired at fair value: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill resulting from merger |  |  | $ 21,089,000 | $ 21,089,000 |  |  |  | $ 10,256,000 |  |  |  | $ 21,089,000 | $ 10,256,000 |
Finite-Lived Intangible Assets, Gross | [1] |  | 3,102,000 | 3,102,000 |  |  |  | 1,023,000 |  |  |  | 3,102,000 | 1,023,000 |
Finite-Lived Intangible Assets, Accumulated Amortization | [1] |  | (665,000) | (665,000) |  |  |  | (550,000) |  |  |  | (665,000) | (550,000) |
Merger and acquisition |  |  |  |  |  |  |  |  |  |  |  | 1,103,000 | 237,000 | $ 55,000
Assets (liabilities) acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill resulting from the FNB merger |  |  | 21,089,000 | 21,089,000 |  |  |  | 10,256,000 |  |  |  | 21,089,000 | 10,256,000 |
Estimated future amortization expense core deposit intangible and MSR [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  |  | 500,000 | 500,000 |  |  |  |  |  |  |  | 500,000 |  |
2017 |  |  | 439,000 | 439,000 |  |  |  |  |  |  |  | 439,000 |  |
2018 |  |  | 380,000 | 380,000 |  |  |  |  |  |  |  | 380,000 |  |
2019 |  |  | 324,000 | 324,000 |  |  |  |  |  |  |  | 324,000 |  |
2020 |  |  | 243,000 | 243,000 |  |  |  |  |  |  |  | 243,000 |  |
Total | [1] |  | 2,437,000 | 2,437,000 |  |  |  | 473,000 |  |  |  | 2,437,000 | 473,000 |
Integration costs and amortization of fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  | 8,040,000 | $ 7,645,000 | $ 7,561,000 | $ 7,587,000 | 7,602,000 | $ 7,574,000 | $ 7,650,000 | $ 7,512,000 | 30,833,000 | 30,338,000 | 29,919,000
Non-interest income |  |  |  | 1,876,000 | 1,736,000 | 1,780,000 | 1,602,000 | 1,762,000 | 1,682,000 | 1,680,000 | 1,616,000 | 7,423,000 | 7,356,000 | 7,423,000
Net income |  |  |  | 2,460,000 | $ 2,857,000 | $ 3,189,000 | $ 3,120,000 | 3,476,000 | $ 3,368,000 | $ 3,365,000 | $ 3,176,000 | 11,626,000 | 13,385,000 | $ 13,375,000
Core Deposits [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to reflect liabilities acquired at fair value: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross | [1] |  | 1,641,000 | 1,641,000 |  |  |  | 0 |  |  |  | 1,641,000 | 0 |
Finite-Lived Intangible Assets, Accumulated Amortization | [1] |  | (25,000) | (25,000) |  |  |  | 0 |  |  |  | (25,000) | 0 |
Estimated future amortization expense core deposit intangible and MSR [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  |  | 296,000 | 296,000 |  |  |  |  |  |  |  | 296,000 |  |
2017 |  |  | 266,000 | 266,000 |  |  |  |  |  |  |  | 266,000 |  |
2018 |  |  | 236,000 | 236,000 |  |  |  |  |  |  |  | 236,000 |  |
2019 |  |  | 206,000 | 206,000 |  |  |  |  |  |  |  | 206,000 |  |
2020 |  |  | 177,000 | 177,000 |  |  |  |  |  |  |  | 177,000 |  |
Total | [1] |  | 1,616,000 | 1,616,000 |  |  |  | 0 |  |  |  | 1,616,000 | 0 |
Covenant not to Compete [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to reflect liabilities acquired at fair value: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross | [1] |  | 125,000 | 125,000 |  |  |  | 0 |  |  |  | 125,000 | 0 |
Finite-Lived Intangible Assets, Accumulated Amortization | [1] |  | (2,000) | (2,000) |  |  |  | 0 |  |  |  | (2,000) | 0 |
Estimated future amortization expense core deposit intangible and MSR [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  |  | 31,000 | 31,000 |  |  |  |  |  |  |  | 31,000 |  |
2017 |  |  | 31,000 | 31,000 |  |  |  |  |  |  |  | 31,000 |  |
2018 |  |  | 31,000 | 31,000 |  |  |  |  |  |  |  | 31,000 |  |
2019 |  |  | 30,000 | 30,000 |  |  |  |  |  |  |  | 30,000 |  |
2020 |  |  | 0 | 0 |  |  |  |  |  |  |  | 0 |  |
Total | [1] |  | 123,000 | 123,000 |  |  |  | $ 0 |  |  |  | 123,000 | 0 |
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 |  | $ 3,809,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price Consideration - Cash for Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price assigned to The First National Bank of Fredericksburg common shares exchanged for cash |  | 5,619,000 |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Price |  | 21,603,000 |  |  |  |  |  |  |  |  |  |  |  |
Net Assets Acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
The First National Bank of Fredericksburg shareholders' equity |  | 12,298,000 |  |  |  |  |  |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 31,000 |  |  |  |  |  |  |  |  |  |  |  |
General credit |  | (1,362,000) |  |  |  |  |  |  |  |  |  |  |  |
Specific credit - non-amortizing |  | (2,495,000) |  |  |  |  |  |  |  |  |  |  |  |
Specific credit - amortizing |  | (665,000) |  |  |  |  |  |  |  |  |  |  |  |
Core deposit intangible |  | 1,641,000 |  |  |  |  |  |  |  |  |  |  |  |
Covenant not to compete |  | 125,000 |  |  |  |  |  |  |  |  |  |  |  |
Premises and equipment |  | 1,203,000 |  |  |  |  |  |  |  |  |  |  |  |
Leased premises contracts |  | (359,000) |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  | (358,000) |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets |  | 785,000 |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to reflect liabilities acquired at fair value: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | (74,000) |  |  |  |  |  |  |  |  |  |  |  |
Acquired and liabilities assumed, net |  | 10,770,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill resulting from merger |  | 10,833,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and other intangibles |  | 12,814,000 |  |  |  |  |  |  |  |  |  |  |  |
Merger and acquisition |  |  |  |  |  |  |  |  |  |  |  | 1,103,000 |  |
Asset acquired and liability assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Price |  | 21,603,000 |  |  |  |  |  |  |  |  |  |  |  |
Assets (liabilities) acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 83,514,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest bearing time deposits with other banks |  | 1,236,000 |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale |  | 23,831,000 |  |  |  |  |  |  |  |  |  |  |  |
Loans |  | 115,211,000 |  |  |  |  |  |  |  |  |  |  |  |
Premises and equipment, net |  | 4,743,000 |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest receivable |  | 282,000 |  |  |  |  |  |  |  |  |  |  |  |
Bank-owned life insurance |  | 4,598,000 |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  | 1,981,000 |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax asset |  | 2,979,000 |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  | 2,332,000 |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | (42,675,000) |  |  |  |  |  |  |  |  |  |  |  |
Deposits other than time deposits |  | (182,555,000) |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest payable |  | (14,000) |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities |  | (4,693,000) |  |  |  |  |  |  |  |  |  |  |  |
Acquired and liabilities assumed, net |  | 10,770,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill resulting from the FNB merger |  | $ 10,833,000 |  |  |  |  |  |  |  |  |  |  |  |
Estimated future amortization expense core deposit intangible and MSR [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 |  |  | 27,000 | 27,000 |  |  |  |  |  |  |  | 27,000 |  |
2016 |  |  | 366,000 | 366,000 |  |  |  |  |  |  |  | 366,000 |  |
2017 |  |  | 332,000 | 332,000 |  |  |  |  |  |  |  | 332,000 |  |
2018 |  |  | 298,000 | 298,000 |  |  |  |  |  |  |  | 298,000 |  |
2019 |  |  | 264,000 | 264,000 |  |  |  |  |  |  |  | 264,000 |  |
2020 |  |  | 200,000 | 200,000 |  |  |  |  |  |  |  | 200,000 |  |
Thereafter |  |  | 494,000 | 494,000 |  |  |  |  |  |  |  | 494,000 |  |
Total |  |  | 1,981,000 | 1,981,000 |  |  |  |  |  |  |  | 1,981,000 |  |
Integration costs and amortization of fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  | 401,000 |  |  |  |  |  |  |  |  |  |  |
Non-interest income |  |  | 21,000 |  |  |  |  |  |  |  |  |  |  |
Net income |  |  | (22,000) |  |  |  |  |  |  |  |  |  |  |
Proforma net interest income |  |  |  |  |  |  |  |  |  |  |  | 37,736,000 | 37,634,000 |
Proforma non-interest income |  |  |  |  |  |  |  |  |  |  |  | 8,576,000 | 8,184,000 |
Proforma net income |  |  |  |  |  |  |  |  |  |  |  | $ 8,640,000 | $ 14,019,000 |
Pro forma earnings per share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 2.57 | $ 4.15 |
Diluted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 2.57 | $ 4.15 |
First National Bank of Fredericksburg [Member] | Core Deposits [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to reflect liabilities acquired at fair value: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  |  | 1,641,000 | 1,641,000 |  |  |  |  |  |  |  | $ 1,641,000 |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  | 25,000 | 25,000 |  |  |  |  |  |  |  | 25,000 |  |
First National Bank of Fredericksburg [Member] | Covenant not to Compete [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to reflect liabilities acquired at fair value: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  |  | 125,000 | 125,000 |  |  |  |  |  |  |  | 125,000 |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  | 2,000 | 2,000 |  |  |  |  |  |  |  | 2,000 |  |
First National Bank of Fredericksburg [Member] | MSR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to reflect liabilities acquired at fair value: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  |  | 215,000 | 215,000 |  |  |  |  |  |  |  | 215,000 |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  | $ 0 | $ 0 |  |  |  |  |  |  |  | $ 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 | 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. |  | $ 15,984,000 |  |  |  |  |  |  |  |  |  |  |  |
[1] | Excludes fully amortized intangible assets

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