PENSION PLAN AND OTHER BENEFIT PLANS, Part 2 (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Basis average final years of employment, for benefit formula	The plan's defined benefit formula generally bases payments to retired employees upon their length of service multiplied by a percentage of the average monthly pay over the last five years of employment.
Defined contribution plan [Abstract]
Number of employee annual hours for eligibility (in hours)	1,000
Defined contribution plan expense	$ 322,090	$ 331,689	$ 332,133
Chemung common stock included in defined contribution plan assets (in shares)	189,337	191,393
Non-discretionary 401K contribution	70,995	40,930
Minimum [Member]
Estimated Future Employer Contributions [Abstract]
Unrecognized net loss increase threshold percentage for amortization of obligation (in hundredths)	10.00%
Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial loss	17,789,018	15,834,042
Prior service cost	35,814	49,670
Total before tax effects	17,824,832	15,883,712
Accumulated benefit obligation	32,247,008	27,490,715
Assumptions Used in Determining Benefit Obligation [Abstract]
Discount Rate (in hundredths)	4.26%	4.95%	5.65%
Assumed rate of future compensation increase (in hundredths)	5.00%	5.00%	5.00%
Net periodic benefit cost [Abstract]
Service cost, benefits earned during the year	1,073,938	993,364	903,538
Interest cost on projected benefit obligation	1,605,912	1,569,151	1,516,817
Expected return on plan assets	(2,742,609)	(2,340,373)	(2,253,421)
Amortization of net loss	1,410,144	706,419	547,717
Amortization of prior service cost	13,856	29,873	45,890
Net periodic cost, Total	1,361,241	958,434	760,541
Expected long-term return on plan assets evaluation frequency, description	three to five years
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]
Net actuarial loss(gain)	3,365,120	6,815,617	972,650
Recognized actuarial loss	(1,410,144)	(706,419)	(547,717)
Amortization of prior service cost	(13,856)	(29,873)	(45,890)
Total recognized in other comprehensive income (loss) (before tax effect)	1,941,120	6,079,325	379,043
Total recognized in net benefit cost and other comprehensive income (loss) (before tax effect)	3,302,361	7,037,759	1,139,584
Amounts expected to be recognized in net periodic cost during next fiscal year [Abstract]
Loss recognition	1,518,336
Prior service cost recognition	13,856
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate (in hundredths)	4.95%	5.65%	6.10%
Expected long-term rate of return on assets (in hundredths)	8.00%	8.00%	8.00%
Assumed rate of future compensation increase (in hundredths)	5.00%	5.00%	5.00%
Plan Assets - Target Allocations [Abstract]
Percentage of Plan Assets (in hundredths)	100.00%	100.00%
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	37,238,650	35,015,567	29,846,889
Future Expected Benefit Payments [Abstract]
2013	1,547,008
2014	1,606,688
2015	1,695,407
2016	1,826,855
2017	1,936,327
2018-2022	10,979,893
Pension Plan [Member] \| Carrying Value [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	37,238,650	35,015,567
Pension Plan [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	33,598,505	31,882,362
Pension Plan [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	3,640,145	3,133,205
Pension Plan [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Cash [Member]
Plan Assets - Target Allocations [Abstract]
Target Allocations - Minimum (in hundredths)	0.00%
Target Allocations - Maximum (in hundredths)	20.00%
Percentage of Plan Assets (in hundredths)	2.00%	29.00%
Expected Long-Term Rate of Return (in hundredths)	4.00%
Pension Plan [Member] \| Cash [Member] \| Carrying Value [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	703,229	10,093,337
Pension Plan [Member] \| Cash [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	703,229	10,093,337
Pension Plan [Member] \| Cash [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Cash [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Alternative Assets [Member]
Plan Assets - Target Allocations [Abstract]
Target Allocations - Minimum (in hundredths)	0.00%
Target Allocations - Maximum (in hundredths)	10.00%
Percentage of Plan Assets (in hundredths)	3.00%	0.00%
Expected Long-Term Rate of Return (in hundredths)	7.50%
Pension Plan [Member] \| Equity Securities - U.S. companies [Member] \| Carrying Value [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	21,579,185	16,625,059
Pension Plan [Member] \| Equity Securities - U.S. companies [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	21,579,185	16,625,059
Pension Plan [Member] \| Equity Securities - U.S. companies [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Equity Securities - U.S. companies [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Equity Securities - International companies [Member] \| Carrying Value [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	629,883	643,118
Pension Plan [Member] \| Equity Securities - International companies [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	629,883	643,118
Pension Plan [Member] \| Equity Securities - International companies [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Equity Securities - International companies [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| US Treasury and Government [Member] \| Carrying Value [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	3,468,448	2,410,971
Pension Plan [Member] \| US Treasury and Government [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	3,468,448	2,410,971
Pension Plan [Member] \| US Treasury and Government [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| US Treasury and Government [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Corporate bonds and notes [Member] \| Carrying Value [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	3,371,255	2,865,173
Pension Plan [Member] \| Corporate bonds and notes [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Corporate bonds and notes [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	3,371,255	2,865,173
Pension Plan [Member] \| Corporate bonds and notes [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Foreign bonds, notes & debentures [Member] \| Carrying Value [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	268,890	268,032
Pension Plan [Member] \| Foreign bonds, notes & debentures [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Foreign bonds, notes & debentures [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	268,890	268,032
Pension Plan [Member] \| Foreign bonds, notes & debentures [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Mutual Funds [Member] \| Carrying Value [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	7,217,760	2,109,877
Pension Plan [Member] \| Mutual Funds [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	7,217,760	2,109,877
Pension Plan [Member] \| Mutual Funds [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Mutual Funds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0
Pension Plan [Member] \| Large Cap Domestic Equities [Member]
Plan Assets - Target Allocations [Abstract]
Target Allocations - Minimum (in hundredths)	30.00%
Target Allocations - Maximum (in hundredths)	60.00%
Percentage of Plan Assets (in hundredths)	51.00%	45.00%
Expected Long-Term Rate of Return (in hundredths)	10.30%
Pension Plan [Member] \| Mid-Cap Domestic Equities [Member]
Plan Assets - Target Allocations [Abstract]
Target Allocations - Minimum (in hundredths)	0.00%
Target Allocations - Maximum (in hundredths)	20.00%
Percentage of Plan Assets (in hundredths)	7.00%	2.00%
Expected Long-Term Rate of Return (in hundredths)	10.60%
Pension Plan [Member] \| Small-Cap Domestic Equities [Member]
Plan Assets - Target Allocations [Abstract]
Target Allocations - Minimum (in hundredths)	0.00%
Target Allocations - Maximum (in hundredths)	15.00%
Percentage of Plan Assets (in hundredths)	2.00%	4.00%
Expected Long-Term Rate of Return (in hundredths)	10.80%
Pension Plan [Member] \| International Equities [Member]
Plan Assets - Target Allocations [Abstract]
Target Allocations - Minimum (in hundredths)	0.00%
Target Allocations - Maximum (in hundredths)	25.00%
Percentage of Plan Assets (in hundredths)	4.00%	0.00%
Expected Long-Term Rate of Return (in hundredths)	10.30%
Pension Plan [Member] \| Intermediate Fixed Income [Member]
Plan Assets - Target Allocations [Abstract]
Target Allocations - Minimum (in hundredths)	20.00%
Target Allocations - Maximum (in hundredths)	50.00%
Percentage of Plan Assets (in hundredths)	31.00%	20.00%
Expected Long-Term Rate of Return (in hundredths)	4.70%
Defined Benefit Health Care Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial loss	218,936	41,970
Prior service cost	(725,000)	(822,000)
Total before tax effects	(506,064)	(780,030)
Assumptions Used in Determining Benefit Obligation [Abstract]
Discount Rate (in hundredths)	4.26%	4.95%	5.65%
Health care cost trend: Initial (in hundredths)	9.00%	10.00%	14.00%
Health care cost trend: Ultimate (in hundredths)	5.00%	5.00%	5.00%
Year ultimate cost trend reached	2018	2018	2020
Net periodic benefit cost [Abstract]
Service cost, benefits earned during the year	39,000	35,000	33,000
Interest cost on projected benefit obligation	71,000	72,000	75,000
Amortization of prior service cost	(97,000)	(97,000)	(97,000)
Recognized actuarial loss	1,000	0	0
Net periodic cost, Total	14,000	10,000	11,000
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]
Net actuarial loss(gain)	177,966	19,705	49,341
Recognized actuarial loss	(1,000)	0	0
Amortization of prior service cost	97,000	97,000	97,000
Total recognized in other comprehensive income (loss) (before tax effect)	273,966	116,705	146,341
Total recognized in net benefit cost and other comprehensive income (loss) (before tax effect)	287,966	126,705	157,341
Amounts expected to be recognized in net periodic cost during next fiscal year [Abstract]
Loss recognition	5,000
Prior service cost recognition	(97,000)
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate (in hundredths)	4.95%	5.65%	6.10%
Health care cost trend: Initial (in hundredths)	10.00%	14.00%	15.00%
Health care cost trend: Ultimate (in hundredths)	5.00%	5.00%	5.00%
Year ultimate cost trend reached	2018	2020	2020
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0	0	0
Future Expected Benefit Payments [Abstract]
2013	157,000
2014	129,000
2015	143,000
2016	139,000
2017	128,000
2018-2022	656,000
Defined Benefit Plan, Description [Abstract]
Retiree age eligibility, prior to amendment	55 years
Self insured health care plan employee contribution prior to plan amendment (in hundredths)	40.00%
Required premium in New York area under Medicare Blue PPO (in hundredths)	100.00%
Self insured health care plan employee contribution (in hundredths)	50.00%
Self insured health care plan Medicare Supplement Plan C contribution (in hundredths)	50.00%
Effect of 1% Change in health care trend rate [Abstract]
Benefit Obligation	4,000	10,000	10,000
Total service and interest cost	(100)	700	300
Benefit Obligation	(5,000)	(11,000)	(12,000)
Total service and interest cost	(500)	(500)	(1,000)
Estimated Future Employer Contributions [Abstract]
Estimated Future Employer Contributions in Next Fiscal Year	157,000
Total unrecognized net loss increased	176,966
Average future working lifetime of active participants		14 years 7 days
Defined Benefit Health Care Plan [Member] \| Minimum [Member]
Defined Benefit Plan, Description [Abstract]
Defined Benefit Plan Retiree Age Eligibility	55 years
Defined Benefit Health Care Plan [Member] \| Maximum [Member]
Defined Benefit Plan, Description [Abstract]
Defined Benefit Plan Retiree Age Eligibility	65 years
Executive Supplemental Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial loss	287,679	226,471
Prior service cost	0	0
Total before tax effects	287,679	226,471
Accumulated benefit obligation	1,092,439	1,004,803
Assumptions Used in Determining Benefit Obligation [Abstract]
Discount Rate (in hundredths)	4.26%	4.95%	5.65%
Assumed rate of future compensation increase (in hundredths)	5.00%	5.00%	5.00%
Net periodic benefit cost [Abstract]
Service cost, benefits earned during the year	34,770	30,625	30,113
Interest cost on projected benefit obligation	51,091	53,771	55,474
Recognized actuarial loss	19,920	9,466	5,582
Net periodic cost, Total	105,781	93,862	91,169
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]
Net actuarial loss(gain)	81,128	70,771	31,415
Recognized actuarial loss	(19,920)	(9,466)	(5,582)
Total recognized in other comprehensive income (loss) (before tax effect)	61,208	61,305	25,833
Total recognized in net benefit cost and other comprehensive income (loss) (before tax effect)	166,989	155,167	117,002
Amounts expected to be recognized in net periodic cost during next fiscal year [Abstract]
Loss recognition	34,301
Prior service cost recognition	0
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate (in hundredths)	4.95%	5.65%	6.10%
Assumed rate of future compensation increase (in hundredths)	5.00%	5.00%	5.00%
Fair Value Measurement of Plan Assets [Abstract]
Fair Value of Plan Assets	0		0
Future Expected Benefit Payments [Abstract]
2013	75,000
2014	75,000
2015	75,000
2016	75,000
2017	75,000
2018-2022	570,000
Estimated Future Employer Contributions [Abstract]
Estimated Future Employer Contributions in Next Fiscal Year	75,000
Balance in the plan	$ 181,000

Refers to the average future working lifetime of active participants.

No definition available.

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- Definition

Refers to the balance in the plan which was expensed during the period.

+ References

No definition available.

+ Details

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- Definition

For a defined benefit plan, the basis final years of employment compensation to average for benefit formula application.

+ References

No definition available.

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- Definition

For a defined benefit plan, description of the evaluation period for expected long-term return on plan assets.

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

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- Definition

For a defined benefit plan, a retiree age eligibility.

+ References

No definition available.

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- Definition

For a defined benefit plan, a retiree age eligibility, prior to a plan amendment.

+ References

No definition available.

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- Definition

For a defined benefit plan self insured health care plan, the employee contribution percentage.

+ References

No definition available.

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- Definition

For a defined benefit plan self insured health care plan, the employee contribution percentage prior to plan amendment.

+ References

No definition available.

+ Details

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- Definition

For a defined benefit plan self insured health care plan, the Medicare supplemental plan C contribution percentage.

+ References

No definition available.

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- Definition

For a defined benefit plan self insured health care plan, the retiree premium contribution percentage for those in a specific geographic area covered under PPO provider.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Percentage as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

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- Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Amount of non-discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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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.

+ References

No definition available.

+ Details

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- Definition

Amount of increase in plan's total unrecognized net loss.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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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=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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.

+ References

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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

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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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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

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Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

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- Definition

The ultimate trend rate for health care costs.

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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- Definition

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

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

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- Definition

Before tax amount of the income statement impact of the reclassification adjustment for prior service costs recognized as a component of net period benefit cost.

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Before tax amount of the (increase) decrease in the value of the projected benefit obligation and the increase (decrease) in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

+ References

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Before tax amount of the income statement impact of the reclassification adjustment for actuarial gain (loss) recognized as a component of net periodic benefit cost.

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