PENSION PLAN AND OTHER BENEFIT PLANS, Amounts Recognized, Assumptions Used, Target and Actual Allocation, Fair Value, Estimated Future Benefit Payments, and Other Disclosures (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): [Abstract]
Net actuarial (gain) loss	$ 8,481,000	$ (6,487,000)	$ 3,624,000
Recognized actuarial loss	(681,000)	(1,624,000)	(1,431,000)
Amortization of prior service cost	90,000	83,000	83,000
Total recognized in other comprehensive income (loss) (before tax effect)	7,890,000	(8,028,000)	2,276,000
Defined Contribution Profit Sharing, Savings and Investment Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Number of annual service hours required for eligibility (in hours)	1000 hours
Total expense	620,000	521,000	393,000
Chemung common stock included in defined contribution plan assets (in shares)	170,714	178,133	189,337
Defined Contribution Supplemental Executive Retirement Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Total expense	213,000	155,000
Balance in the plan	550,000	337,000
Pension Plan [Member]
Amount recognized in accumulated other comprehensive income [Abstract]
Net actuarial loss	17,388,000	9,843,000
Prior service cost (benefit)	15,000	22,000
Total before tax effects	17,403,000	9,865,000
Accumulated benefit obligation	38,700,000	31,200,000
Principal actuarial assumptions used in determining projected benefit obligation [Abstract]
Discount rate (in hundredths)	4.09%	4.92%	4.26%
Assumed rate of future compensation increase (in hundredths)	5.00%	5.00%	5.00%
Net periodic benefit cost [Abstract]
Service cost	1,045,000	1,195,000	1,074,000
Interest cost	1,738,000	1,587,000	1,606,000
Expected return on plan assets	(3,174,000)	(2,824,000)	(2,743,000)
Amortization of net loss/ Recognized actuarial loss	649,000	1,579,000	1,410,000
Amortization of prior service cost (benefit)	7,000	14,000	14,000
Net periodic cost	265,000	1,551,000	1,361,000
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): [Abstract]
Net actuarial (gain) loss	8,195,000	(6,367,000)	3,365,000
Recognized actuarial loss	(649,000)	(1,579,000)	(1,410,000)
Amortization of prior service cost	(7,000)	(14,000)	(14,000)
Total recognized in other comprehensive income (loss) (before tax effect)	7,539,000	(7,960,000)	1,941,000
Total recognized in net benefit cost and other comprehensive income (loss) (before tax effect)	7,804,000	(6,409,000)	3,302,000
Amounts expected to be recognized in net periodic cost during next fiscal year [Abstract]
Loss recognition	1,475,000
Prior service cost recognition	7,000
Weighted-average assumptions for net periodic cost [Abstract]
Discount rate (in hundredths)	4.92%	4.26%	4.95%
Expected long-term rate of return on assets (in hundredths)	7.75%	7.75%	8.00%
Assumed rate of future compensation increase (in hundredths)	5.00%	5.00%	5.00%
Target allocations of plan assets [Abstract]
Percentage of plan assets (in hundredths)	100.00%	100.00%
Expected long-term rate of return on assets (in hundredths)	7.75%	7.75%	8.00%
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	43,336,000	41,782,000	37,239,000
Estimated benefit payments for each of next five years and aggregate amount expected to be paid [Abstract]
2015	1,761,000
2016	1,849,000
2017	1,949,000
2018	2,052,000
2019	2,114,000
2020-2024	11,949,000
Pension Plan [Member] \| Minimum [Member]
Weighted-average assumptions for net periodic cost [Abstract]
Evaluation period of expected long-term return on plan assets	3 years
Pension Plan [Member] \| Maximum [Member]
Weighted-average assumptions for net periodic cost [Abstract]
Evaluation period of expected long-term return on plan assets	5 years
Pension Plan [Member] \| Carrying Value [Member] \| Carrying Value [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	43,336,000	41,782,000
Pension Plan [Member] \| Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	39,305,000	38,749,000
Pension Plan [Member] \| Fair Value [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	4,031,000	3,033,000
Pension Plan [Member] \| Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| Cash [Member]
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets (in hundredths)	2.50%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)	0.00%
Target allocation, maximum (in hundredths)	20.00%
Percentage of plan assets (in hundredths)	1.00%	2.00%
Expected long-term rate of return on assets (in hundredths)	2.50%
Pension Plan [Member] \| Cash [Member] \| Carrying Value [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	626,000	982,000
Pension Plan [Member] \| Cash [Member] \| Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	626,000	982,000
Pension Plan [Member] \| Cash [Member] \| Fair Value [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| Cash [Member] \| Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| Alternative Assets [Member]
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets (in hundredths)	7.50%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)	0.00%
Target allocation, maximum (in hundredths)	10.00%
Percentage of plan assets (in hundredths)	2.00%	3.00%
Expected long-term rate of return on assets (in hundredths)	7.50%
Pension Plan [Member] \| Equity Securities - U.S. Companies [Member] \| Carrying Value [Member] \| Carrying Value [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	28,011,000	27,170,000
Pension Plan [Member] \| Equity Securities - U.S. Companies [Member] \| Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	28,011,000	27,170,000
Pension Plan [Member] \| Equity Securities - U.S. Companies [Member] \| Fair Value [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| Equity Securities - U.S. Companies [Member] \| Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| Equity Securities - International Companies [Member] \| Carrying Value [Member] \| Carrying Value [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	856,000
Pension Plan [Member] \| Equity Securities - International Companies [Member] \| Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	856,000
Pension Plan [Member] \| Equity Securities - International Companies [Member] \| Fair Value [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0
Pension Plan [Member] \| Equity Securities - International Companies [Member] \| Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0
Pension Plan [Member] \| U.S. Treasuries/Government Bonds [Member] \| Carrying Value [Member] \| Carrying Value [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	2,701,000	3,309,000
Pension Plan [Member] \| U.S. Treasuries/Government Bonds [Member] \| Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	2,701,000	3,309,000
Pension Plan [Member] \| U.S. Treasuries/Government Bonds [Member] \| Fair Value [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| U.S. Treasuries/Government Bonds [Member] \| Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| U.S. Corporate Bonds [Member] \| Carrying Value [Member] \| Carrying Value [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	3,775,000	2,771,000
Pension Plan [Member] \| U.S. Corporate Bonds [Member] \| Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| U.S. Corporate Bonds [Member] \| Fair Value [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	3,775,000	2,771,000
Pension Plan [Member] \| U.S. Corporate Bonds [Member] \| Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| Foreign Bonds, Notes & Debentures [Member] \| Carrying Value [Member] \| Carrying Value [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	256,000	262,000
Pension Plan [Member] \| Foreign Bonds, Notes & Debentures [Member] \| Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| Foreign Bonds, Notes & Debentures [Member] \| Fair Value [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	256,000	262,000
Pension Plan [Member] \| Foreign Bonds, Notes & Debentures [Member] \| Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| Mutual Funds [Member] \| Carrying Value [Member] \| Carrying Value [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	7,111,000	7,288,000
Pension Plan [Member] \| Mutual Funds [Member] \| Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	7,111,000	7,288,000
Pension Plan [Member] \| Mutual Funds [Member] \| Fair Value [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| Mutual Funds [Member] \| Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0
Pension Plan [Member] \| Large-Cap Domestic Equities [Member]
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets (in hundredths)	10.30%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)	30.00%
Target allocation, maximum (in hundredths)	60.00%
Percentage of plan assets (in hundredths)	50.00%	54.00%
Expected long-term rate of return on assets (in hundredths)	10.30%
Pension Plan [Member] \| Mid-Cap Domestic Equities [Member]
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets (in hundredths)	10.60%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)	0.00%
Target allocation, maximum (in hundredths)	20.00%
Percentage of plan assets (in hundredths)	14.00%	8.00%
Expected long-term rate of return on assets (in hundredths)	10.60%
Pension Plan [Member] \| Small-Cap Domestic Equities [Member]
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets (in hundredths)	10.80%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)	0.00%
Target allocation, maximum (in hundredths)	15.00%
Percentage of plan assets (in hundredths)	3.00%	3.00%
Expected long-term rate of return on assets (in hundredths)	10.80%
Pension Plan [Member] \| International Equities [Member]
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets (in hundredths)	10.30%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)	0.00%
Target allocation, maximum (in hundredths)	25.00%
Percentage of plan assets (in hundredths)	4.00%	4.00%
Expected long-term rate of return on assets (in hundredths)	10.30%
Pension Plan [Member] \| Intermediate Fixed Income [Member]
Weighted-average assumptions for net periodic cost [Abstract]
Expected long-term rate of return on assets (in hundredths)	4.70%
Target allocations of plan assets [Abstract]
Target allocation, minimum (in hundredths)	20.00%
Target allocation, maximum (in hundredths)	50.00%
Percentage of plan assets (in hundredths)	26.00%	26.00%
Expected long-term rate of return on assets (in hundredths)	4.70%
Defined Benefit Health Care Plan [Member]
Amount recognized in accumulated other comprehensive income [Abstract]
Net actuarial loss	322,000	148,000
Prior service cost (benefit)	(531,000)	(628,000)
Total before tax effects	(209,000)	(480,000)
Principal actuarial assumptions used in determining projected benefit obligation [Abstract]
Discount rate (in hundredths)	4.09%	4.92%	4.26%
Health care cost trend: Initial (in hundredths)	7.00%	8.00%	9.00%
Health care cost trend: Ultimate (in hundredths)	5.00%	5.00%	5.00%
Year ultimate cost trend reached	2018	2018	2018
Net periodic benefit cost [Abstract]
Service cost	39,000	44,000	39,000
Interest cost	72,000	66,000	71,000
Amortization of net loss/ Recognized actuarial loss	3,000	10,000	1,000
Amortization of prior service cost (benefit)	(97,000)	(97,000)	(97,000)
Net periodic cost	17,000	23,000	14,000
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): [Abstract]
Net actuarial (gain) loss	177,000	(61,000)	178,000
Recognized actuarial loss	(3,000)	(10,000)	(1,000)
Amortization of prior service cost	97,000	97,000	97,000
Total recognized in other comprehensive income (loss) (before tax effect)	271,000	26,000	274,000
Total recognized in net benefit cost and other comprehensive income (loss) (before tax effect)	288,000	49,000	288,000
Increase in unrecognized net loss	174,000
Unrecognized net gain or loss increase threshold percentage for amortization of obligation (in hundredths)	10.00%
Average future working lifetime of active participants	14 years 10 months 20 days
Amounts expected to be recognized in net periodic cost during next fiscal year [Abstract]
Loss recognition	10,000
Prior service cost recognition	(97,000)
Effect of a 1% increase in health care trend rate on [Abstract]
Benefit obligation	5,000	15,000	4,000
Total service and interest cost	0	0	0
Effect of a 1% decrease in health care trend rate on [Abstract]
Benefit obligation	(6,000)	(23,000)	(5,000)
Total service and interest cost	0	(2,000)	(1,000)
Weighted-average assumptions for net periodic cost [Abstract]
Discount rate (in hundredths)	4.92%	4.26%	4.95%
Health care cost trend: Initial (in hundredths)	8.00%	9.00%	10.00%
Health care cost trend: Ultimate (in hundredths)	5.00%	5.00%	5.00%
Year ultimate reached	2018	2018	2018
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0	0
Estimated benefit payments for each of next five years and aggregate amount expected to be paid [Abstract]
2015	201,000
2016	176,000
2017	140,000
2018	150,000
2019	159,000
2020-2024	652,000
Estimated employer contributions in next fiscal year	201,000
Executive Supplemental Pension Plan [Member]
Amount recognized in accumulated other comprehensive income [Abstract]
Net actuarial loss	275,000	194,000
Prior service cost (benefit)	0	0
Total before tax effects	275,000	194,000
Accumulated benefit obligation	1,200,000	1,000,000
Principal actuarial assumptions used in determining projected benefit obligation [Abstract]
Discount rate (in hundredths)	4.09%	4.92%	4.26%
Assumed rate of future compensation increase (in hundredths)	5.00%	5.00%	5.00%
Net periodic benefit cost [Abstract]
Service cost	38,000	40,000	35,000
Interest cost	55,000	48,000	51,000
Amortization of net loss/ Recognized actuarial loss	29,000	34,000	20,000
Net periodic cost	122,000	122,000	106,000
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): [Abstract]
Net actuarial (gain) loss	110,000	(59,000)	81,000
Recognized actuarial loss	(29,000)	(34,000)	(20,000)
Total recognized in other comprehensive income (loss) (before tax effect)	81,000	(93,000)	61,000
Total recognized in net benefit cost and other comprehensive income (loss) (before tax effect)	203,000	29,000	167,000
Amounts expected to be recognized in net periodic cost during next fiscal year [Abstract]
Loss recognition	50,000
Prior service cost recognition	0
Weighted-average assumptions for net periodic cost [Abstract]
Discount rate (in hundredths)	4.92%	4.26%	4.95%
Assumed rate of future compensation increase (in hundredths)	5.00%	5.00%	5.00%
Fair value plan assets by asset class [Abstract]
Fair value of plan assets	0	0	0
Estimated benefit payments for each of next five years and aggregate amount expected to be paid [Abstract]
2015	75,000
2016	75,000
2017	75,000
2018	116,000
2019	116,000
2020-2024	580,000
Estimated employer contributions in next fiscal year	$ 75,000

Refers to the average future working lifetime of active participants.

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- Definition

Refers to the evaluation period for expected long-term return on plan assets for a defined benefit plan.

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No definition available.

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected obligation for the cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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No definition available.

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- Definition

The ultimate trend rate for health care costs used in the calculation of benefit obligations.

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No definition available.

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- Definition

Year the ultimate health care cost trend rate is expected to be reached in the calculation of benefit obligations, in CCYY format.

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No definition available.

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- Definition

For a defined contribution plan, the number of sponsoring entity common stock shares included in plan assets.

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No definition available.

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Refers to the balance of a defined contribution plan outstanding as of the balance sheet date.

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- Definition

Number of annual service hours for employees to be eligible to participate in the defined contribution plan or plans described.

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No definition available.

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- Definition

Amount of increase (decrease) in plan's total unrecognized net loss for benefit obligation amortization.

+ References

No definition available.

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- Definition

Amount before tax, of the sum of net benefit cost and other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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No definition available.

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- Definition

Amount of increase in plan's total unrecognized net loss threshold for benefit obligation amortization.

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No definition available.

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- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503844

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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- Definition

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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Expected rate of compensation increases (for pay-related plans).

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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