$CHMG
Chemung Financial Corp Stock $chmg

$chmg Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-Q Financial Statement

#000076356320000094 Filed on November 05, 2020

Income Statement

Concept	2020 Q4	2020 Q3	2019 Q3
Revenue		$16.71M	$16.81M
YoY Change		-0.56%	4.16%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$810.0K	$830.0K	$920.0K
YoY Change	-6.9%	-9.78%	-7.07%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$845.0K	$1.666M
YoY Change		-49.28%	57.62%
% of Operating Profit
Other Income/Expense, Net			$13.53M
YoY Change			0.72%
Pretax Income	$6.530M	$7.167M	$2.132M
YoY Change	25.58%	236.16%	-75.58%
Income Tax	$1.290M	$1.456M	$176.0K
% Of Pretax Income	19.75%	20.32%	8.26%
Net Earnings	$5.230M	$5.711M	$1.956M
YoY Change	24.52%	191.97%	-71.77%
Net Earnings / Revenue		34.17%	11.64%
Basic Earnings Per Share		$1.19
Diluted Earnings Per Share	$1.113M	$1.19	$402.5K
COMMON SHARES
Basic Shares Outstanding	4.657M shares	4.773M shares	4.843M shares
Diluted Shares Outstanding		4.773M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$108.5M	$149.9M	$146.3M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$20.12M	$20.89M	$22.96M
YoY Change	-10.25%	-9.02%	-10.0%
Goodwill	$21.82M	$21.82M	$21.82M
YoY Change	0.0%	0.0%	0.0%
Intangibles	$258.0K	$371.0K	$886.0K
YoY Change	-65.23%	-58.13%	-41.98%
Long-Term Investments	$2.500M	$2.300M	$2.100M
YoY Change	13.64%	9.52%	5.0%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$2.279B	$2.165B	$1.794B
YoY Change	27.5%	20.7%	2.27%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$29.70M	$30.90M	$21.60M
YoY Change	51.53%	43.06%	36.71%
Accrued Expenses	$7.300M	$7.600M	$8.100M
YoY Change	-9.88%	-6.17%
Deferred Revenue
YoY Change
Short-Term Debt
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$38.20M	$39.70M	$31.00M
YoY Change	31.72%	28.06%	82.35%
LONG-TERM LIABILITIES
Long-Term Debt	$3.800M	$3.900M	$4.100M
YoY Change	-7.32%	-4.88%	-6.82%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$3.800M	$3.900M	$4.100M
YoY Change	-7.32%	-4.88%	-6.82%
TOTAL LIABILITIES
Total Short-Term Liabilities	$38.20M	$39.70M	$31.00M
Total Long-Term Liabilities	$3.800M	$3.900M	$4.100M
Total Liabilities	$2.080B	$1.968B	$1.612B
YoY Change	29.56%	22.12%	0.89%
SHAREHOLDERS EQUITY
Retained Earnings	$168.0M	$164.0M	$150.8M
YoY Change	9.31%	8.77%	8.73%
Common Stock	$46.82M	$46.95M	$46.52M
YoY Change	0.82%	0.92%	0.99%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$17.53M	$15.57M	$11.96M
YoY Change	49.66%	30.22%	-7.51%
Treasury Stock Shares	642.2K shares	589.7K shares	465.0K shares
Shareholders Equity	$199.7M	$197.0M	$182.0M
YoY Change
Total Liabilities & Shareholders Equity	$2.279B	$2.165B	$1.794B
YoY Change	27.5%	20.7%	2.27%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2019 Q3
OPERATING ACTIVITIES
Net Income	$5.230M	$5.711M	$1.956M
YoY Change	24.52%	191.97%	-71.77%
Depreciation, Depletion And Amortization	$810.0K	$830.0K	$920.0K
YoY Change	-6.9%	-9.78%	-7.07%
Cash From Operating Activities	$8.670M	$5.660M	$8.440M
YoY Change	88.48%	-32.94%	-11.72%
INVESTING ACTIVITIES
Capital Expenditures	-$170.0K	-$210.0K	-$120.0K
YoY Change	-65.31%	75.0%	-55.56%
Acquisitions
YoY Change
Other Investing Activities	-$159.6M	-$120.9M	-$12.70M
YoY Change	595.38%	851.81%	-138.65%
Cash From Investing Activities	-$159.8M	-$121.1M	-$12.83M
YoY Change	581.57%	843.8%	-139.37%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	109.7M	110.2M	34.23M
YoY Change	-2076.94%	221.85%	-7.39%
NET CHANGE
Cash From Operating Activities	8.670M	5.660M	8.440M
Cash From Investing Activities	-159.8M	-121.1M	-12.83M
Cash From Financing Activities	109.7M	110.2M	34.23M
Net Change In Cash	-41.37M	-5.260M	29.84M
YoY Change	69.62%	-117.63%	-62.28%
FREE CASH FLOW
Cash From Operating Activities	$8.670M	$5.660M	$8.440M
Capital Expenditures	-$170.0K	-$210.0K	-$120.0K
Free Cash Flow	$8.840M	$5.870M	$8.560M
YoY Change	73.67%	-31.43%	-12.92%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Entity Central Index Key EntityCentralIndexKey	0000763563
	dei	Document Type DocumentType	10-Q
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	000-13888
	dei	Entity Registrant Name EntityRegistrantName	CHEMUNG FINANCIAL CORP
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	NY
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	16-1237038
	dei	Entity Address Address Line1 EntityAddressAddressLine1	One Chemung Canal Plaza
	dei	Entity Address City Or Town EntityAddressCityOrTown	Elmira
	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	14901
	dei	City Area Code CityAreaCode	607
	dei	Local Phone Number LocalPhoneNumber	737-3711
	dei	Security12b Title Security12bTitle	Common stock, par value $.01 per share
	dei	Trading Symbol TradingSymbol	CHMG
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	true
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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CY2020Q3	us-gaap	Occupancy Net OccupancyNet	1454000	USD
CY2019Q3	us-gaap	Occupancy Net OccupancyNet	1424000	USD
	us-gaap	Occupancy Net OccupancyNet	4406000	USD
	us-gaap	Occupancy Net OccupancyNet	4469000	USD
CY2020Q3	us-gaap	Equipment Expense EquipmentExpense	538000	USD
CY2019Q3	us-gaap	Equipment Expense EquipmentExpense	717000	USD
	us-gaap	Equipment Expense EquipmentExpense	1573000	USD
	us-gaap	Equipment Expense EquipmentExpense	1840000	USD
CY2020Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1777000	USD
CY2019Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1818000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	5630000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	5418000	USD
CY2020Q3	us-gaap	Professional Fees ProfessionalFees	453000	USD
CY2019Q3	us-gaap	Professional Fees ProfessionalFees	395000	USD
	us-gaap	Professional Fees ProfessionalFees	1313000	USD
	us-gaap	Professional Fees ProfessionalFees	1218000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	120000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	151000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	371000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	465000	USD
CY2020Q3	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	140000	USD
CY2019Q3	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	231000	USD
	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	546000	USD
	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	644000	USD
CY2020Q3	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	53000	USD
CY2019Q3	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	9000	USD
	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	87000	USD
	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	80000	USD
CY2020Q3	chmg	Federal Deposit Insurance Corporation Premium Expense Benefit FederalDepositInsuranceCorporationPremiumExpenseBenefit	247000	USD
CY2019Q3	chmg	Federal Deposit Insurance Corporation Premium Expense Benefit FederalDepositInsuranceCorporationPremiumExpenseBenefit	-10000	USD
	chmg	Federal Deposit Insurance Corporation Premium Expense Benefit FederalDepositInsuranceCorporationPremiumExpenseBenefit	726000	USD
	chmg	Federal Deposit Insurance Corporation Premium Expense Benefit FederalDepositInsuranceCorporationPremiumExpenseBenefit	476000	USD
CY2020Q3	us-gaap	Loan Portfolio Expense LoanPortfolioExpense	301000	USD
CY2019Q3	us-gaap	Loan Portfolio Expense LoanPortfolioExpense	171000	USD
	us-gaap	Loan Portfolio Expense LoanPortfolioExpense	798000	USD
	us-gaap	Loan Portfolio Expense LoanPortfolioExpense	557000	USD
CY2020Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	1200000	USD
CY2019Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	1416000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3878000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	4238000	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	13362000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	13525000	USD
	us-gaap	Noninterest Expense NoninterestExpense	40339000	USD
	us-gaap	Noninterest Expense NoninterestExpense	40845000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7167000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2132000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	17344000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	13848000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1456000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	176000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3315000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2443000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	5711000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	1956000	USD
	us-gaap	Net Income Loss NetIncomeLoss	14029000	USD
	us-gaap	Net Income Loss NetIncomeLoss	11405000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	4773000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	4871000	shares
	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	4836000	shares
	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	4866000	shares
CY2020Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	1.19
CY2019Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.40
	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	2.90
	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	2.34
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	5711000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	1956000	USD
	us-gaap	Net Income Loss NetIncomeLoss	14029000	USD
	us-gaap	Net Income Loss NetIncomeLoss	11405000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-692000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	3573000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	9919000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	10885000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	19000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-692000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	3573000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	9919000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	-55000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	10866000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-176000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	911000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	2530000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	2771000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-516000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	2662000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	7389000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	8095000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	-55000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	-165000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	-165000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-77000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-72000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-231000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-218000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-22000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-17000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-66000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-53000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-6000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-4000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-14000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-13000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-16000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-13000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-52000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-40000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-500000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2675000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7441000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	8135000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5211000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	4631000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	21470000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	19540000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	178387000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	1956000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2675000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	97000	USD
CY2019Q3	chmg	Restricted Stock Units For Directors Deferred Compensation Plan RestrictedStockUnitsForDirectorsDeferredCompensationPlan	10000	USD
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.26
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1260000	USD
CY2019Q3	us-gaap	Stock Issued During Period Shares Treasury Stock Reissued StockIssuedDuringPeriodSharesTreasuryStockReissued	2485	shares
CY2019Q3	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	179000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	182044000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	194589000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	5711000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-500000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	197005000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	165029000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	125000	USD
CY2020Q3	chmg	Restricted Stock Units For Directors Deferred Compensation Plan RestrictedStockUnitsForDirectorsDeferredCompensationPlan	5000	USD
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.26
CY2020Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1229000	USD
CY2020Q3	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	64185	shares
CY2020Q3	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1816000	USD
CY2020Q3	us-gaap	Stock Issued During Period Shares Treasury Stock Reissued StockIssuedDuringPeriodSharesTreasuryStockReissued	18202	shares
CY2020Q3	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	120000	USD
	us-gaap	Net Income Loss NetIncomeLoss	11405000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	8135000	USD
	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	296000	USD
	chmg	Restricted Stock Units For Directors Deferred Compensation Plan RestrictedStockUnitsForDirectorsDeferredCompensationPlan	31000	USD
	chmg	Distribution Of Shares Of Treasury Stock For Employee Restricted Stock Awards Shares DistributionOfSharesOfTreasuryStockForEmployeeRestrictedStockAwardsShares	439	shares
	chmg	Distribution Of Treasury Stock Grants For Employee Restricted Stock Awards DistributionOfTreasuryStockGrantsForEmployeeRestrictedStockAwards	11000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.78
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	3775000	USD
	chmg	Distribution Of Shares Of Treasury Stock For Directors Compensation Shares DistributionOfSharesOfTreasuryStockForDirectorsCompensationShares	8465	shares
	chmg	Distribution Of Shares Of Treasury Stock For Directors Compensation Value DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue	357000	USD
	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	2373	shares
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	100000	USD
	chmg	Distribution Of Shares Of Treasury Stock For Deferred Directors Compensation In Shares DistributionOfSharesOfTreasuryStockForDeferredDirectorsCompensationInShares	2551	shares
	chmg	Distribution Of Shares Of Treasury Stock For Deffered Directors Compensation Value DistributionOfSharesOfTreasuryStockForDefferedDirectorsCompensationValue	13000	USD
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	272	shares
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	13000	USD
	us-gaap	Stock Issued During Period Shares Treasury Stock Reissued StockIssuedDuringPeriodSharesTreasuryStockReissued	10250	shares
	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	455000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	182044000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	182627000	USD
	us-gaap	Net Income Loss NetIncomeLoss	14029000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7441000	USD
	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	431000	USD
	chmg	Restricted Stock Units For Directors Deferred Compensation Plan RestrictedStockUnitsForDirectorsDeferredCompensationPlan	25000	USD
	chmg	Distribution Of Treasury Stock Grants For Employee Restricted Stock Awards Shares DistributionOfTreasuryStockGrantsForEmployeeRestrictedStockAwardsShares	255	shares
	chmg	Distribution Of Treasury Stock Grants For Employee Restricted Stock Awards DistributionOfTreasuryStockGrantsForEmployeeRestrictedStockAwards	0	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.78
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	3743000	USD
	chmg	Distribution Of Shares Of Treasury Stock For Directors Compensation Shares DistributionOfSharesOfTreasuryStockForDirectorsCompensationShares	7923	shares
	chmg	Distribution Of Shares Of Treasury Stock For Directors Compensation Value DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue	350000	USD
	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	2274	shares
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	100000	USD
	chmg	Distribution Of Shares Of Treasury Stock For Deferred Directors Compensation In Shares DistributionOfSharesOfTreasuryStockForDeferredDirectorsCompensationInShares	6426	shares
	chmg	Distribution Of Shares Of Treasury Stock For Deffered Directors Compensation Value DistributionOfSharesOfTreasuryStockForDefferedDirectorsCompensationValue	-12000	USD
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	186206	shares
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	5137000	USD
	us-gaap	Stock Issued During Period Shares Treasury Stock Reissued StockIssuedDuringPeriodSharesTreasuryStockReissued	32387	shares
	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	894000	USD
	us-gaap	Stock Issued During Period Shares Restricted Stock Award Forfeited StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	112	shares
	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	197005000	USD
	us-gaap	Net Income Loss NetIncomeLoss	14029000	USD
	us-gaap	Net Income Loss NetIncomeLoss	11405000	USD
	chmg	Operating Lease Right Of Use Asset Amortization OperatingLeaseRightOfUseAssetAmortization	527000	USD
	chmg	Operating Lease Right Of Use Asset Amortization OperatingLeaseRightOfUseAssetAmortization	541000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	371000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	465000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	3989000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	5684000	USD
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-7000	USD
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-35000	USD
	us-gaap	Depreciation Depreciation	2215000	USD
	us-gaap	Depreciation Depreciation	2375000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1003000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-784000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	916000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	146000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	17216000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	7293000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	17174000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	7958000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-71000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-87000	USD
	chmg	Other Real Estate Owned Writedown OtherRealEstateOwnedWritedown	38000	USD
	chmg	Other Real Estate Owned Writedown OtherRealEstateOwnedWritedown	53000	USD
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-33000	USD
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	106000	USD
	us-gaap	Proceeds From Payments For Trading Securities ProceedsFromPaymentsForTradingSecurities	24000	USD
	us-gaap	Proceeds From Payments For Trading Securities ProceedsFromPaymentsForTradingSecurities	22000	USD
	us-gaap	Increase Decrease In Debt Securities Trading IncreaseDecreaseInDebtSecuritiesTrading	174000	USD
	us-gaap	Increase Decrease In Debt Securities Trading IncreaseDecreaseInDebtSecuritiesTrading	72000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	10264000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	2233000	USD
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-38000	USD
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	94000	USD
	chmg	Restricted Stock Expense Directors Deferred Compensation Plan RestrictedStockExpenseDirectorsDeferredCompensationPlan	25000	USD
	chmg	Restricted Stock Expense Directors Deferred Compensation Plan RestrictedStockExpenseDirectorsDeferredCompensationPlan	31000	USD
	chmg	Expense Related To Employee Stock Compensation ExpenseRelatedToEmployeeStockCompensation	102000	USD
	chmg	Expense Related To Employee Stock Compensation ExpenseRelatedToEmployeeStockCompensation	100000	USD
	chmg	Expense Related To Employee Stock Awards ExpenseRelatedToEmployeeStockAwards	431000	USD
	chmg	Expense Related To Employee Stock Awards ExpenseRelatedToEmployeeStockAwards	296000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	500000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	467000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	9119000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	3592000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	147000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	48000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	19987000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	21808000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	15200000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	39508000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	37152000	USD
	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	1349000	USD
	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	2498000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	142797000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	67522000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	1286000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	1043000	USD
	us-gaap	Payments To Acquire Federal Reserve Stock PaymentsToAcquireFederalReserveStock	51000	USD
	us-gaap	Payments To Acquire Federal Reserve Stock PaymentsToAcquireFederalReserveStock	6000	USD
	us-gaap	Proceeds From Sale Of Federal Reserve Stock ProceedsFromSaleOfFederalReserveStock	0	USD
	us-gaap	Proceeds From Sale Of Federal Reserve Stock ProceedsFromSaleOfFederalReserveStock	53000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	696000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	392000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	253000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	376000	USD
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	213000	USD
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	232582000	USD
	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	-4411000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-336089000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-9273000	USD
	us-gaap	Increase Decrease In Other Deposits IncreaseDecreaseInOtherDeposits	307723000	USD
	us-gaap	Increase Decrease In Other Deposits IncreaseDecreaseInOtherDeposits	-12330000	USD
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	44327000	USD
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	19599000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	245000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	0	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	175000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	164000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	5137000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
	us-gaap	Proceeds From Sale Of Treasury Stock ProceedsFromSaleOfTreasuryStock	894000	USD
	us-gaap	Proceeds From Sale Of Treasury Stock ProceedsFromSaleOfTreasuryStock	455000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	3777000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	3769000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	344100000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	3791000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	27998000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	16326000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	121904000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	129972000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	149902000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	146298000	USD
	us-gaap	Interest Paid Net InterestPaidNet	3086000	USD
	us-gaap	Interest Paid Net InterestPaidNet	4651000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	3785000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	3225000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	431000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	152000	USD
CY2020Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	1229000	USD
CY2019Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	1260000	USD
	chmg	Treasury Stock Repurchasedas Payroll Tax Payment TreasuryStockRepurchasedasPayrollTaxPayment	54000	USD
	chmg	Treasury Stock Repurchasedas Payroll Tax Payment TreasuryStockRepurchasedasPayrollTaxPayment	-13000	USD
	chmg	Distribution Of Shares Of Treasury Stock For Directors Compensation Value DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue	350000	USD
	chmg	Distribution Of Shares Of Treasury Stock For Directors Compensation Value DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue	357000	USD
	chmg	Distribution Of Shares Of Treasury Stock For Directors Deferred Compensation Value DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue	-12000	USD
	chmg	Distribution Of Shares Of Treasury Stock For Directors Deferred Compensation Value DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue	13000	USD
	chmg	Treasury Stock Issued During Period Value Restricted Stock Award Forfeitures TreasuryStockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	5000	USD
	chmg	Treasury Stock Issued During Period Value Restricted Stock Award Forfeitures TreasuryStockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0	USD
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Reclassifications</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Amounts in the prior year financial statements are reclassified whenever necessary to conform to the current year's presentation.</span></div>
CY2020Q3	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	4773000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	4871000	shares
	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	4836000	shares
	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	4866000	shares
CY2019Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2020Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2020Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	384547000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	12062000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	309000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	396300000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	282256000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3146000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1312000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	284090000	USD
CY2020Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3047000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	46000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	USD
CY2020Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3093000	USD
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3115000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	24000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	USD
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3139000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	0	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	0	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	609000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	613000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	27232000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	28769000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	2438000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2480000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	19703000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	20755000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	0	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	0	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	759000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	800000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	0	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	0	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	47694000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	50324000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	3047000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	3093000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	384547000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	396300000	USD
CY2020Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3047000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3093000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	0	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	0	USD
	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	0	USD
	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	15200000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	79000	USD
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	USD
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	-60000	USD
	chmg	Tax Expense From The Sale Of Available For Sale Securities TaxExpenseFromTheSaleOfAvailableForSaleSecurities	0	USD
	chmg	Tax Expense From The Sale Of Available For Sale Securities TaxExpenseFromTheSaleOfAvailableForSaleSecurities	5000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	86555000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	258000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	4721000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	51000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	91276000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	309000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	74520000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	800000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	55748000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	512000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	130268000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1312000	USD
CY2020Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	1538493000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1309219000	USD
CY2020Q3	us-gaap	Interest Receivable InterestReceivable	5035000	USD
CY2019Q4	us-gaap	Interest Receivable InterestReceivable	3684000	USD
CY2020Q3	chmg	Financing Receivable After Interest Receivable On Loans Before Allowance On Credit Loss FinancingReceivableAfterInterestReceivableOnLoansBeforeAllowanceOnCreditLoss	1543528000	USD
CY2019Q4	chmg	Financing Receivable After Interest Receivable On Loans Before Allowance On Credit Loss FinancingReceivableAfterInterestReceivableOnLoansBeforeAllowanceOnCreditLoss	1312903000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	24130000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	326000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	107000	USD
CY2020Q3	chmg	Financing Receivable Allowance For Credit Losses Net Charge Off FinancingReceivableAllowanceForCreditLossesNetChargeOff	-219000	USD
CY2020Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	679000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	24590000	USD
CY2019Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	19656000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	302000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	128000	USD
CY2019Q3	chmg	Financing Receivable Allowance For Credit Losses Net Charge Off FinancingReceivableAllowanceForCreditLossesNetChargeOff	-174000	USD
CY2019Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	4441000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23923000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23478000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3248000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	371000	USD
	chmg	Financing Receivable Allowance For Credit Losses Net Charge Off FinancingReceivableAllowanceForCreditLossesNetChargeOff	-2877000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	3989000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	24590000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	450000	USD
	chmg	Financing Receivable Allowance For Credit Losses Net Charge Off FinancingReceivableAllowanceForCreditLossesNetChargeOff	-705000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	18944000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	1155000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	5684000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23923000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	5766000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	18824000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	24590000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	8097000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	15381000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23478000	USD
CY2020Q3	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	16354000	USD
CY2020Q3	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1527174000	USD
CY2020Q3	chmg	Financing Receivable After Interest Receivable On Loans Before Allowance On Credit Loss FinancingReceivableAfterInterestReceivableOnLoansBeforeAllowanceOnCreditLoss	1543528000	USD
CY2019Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	15665000	USD
CY2019Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1297238000	USD
CY2019Q4	chmg	Financing Receivable After Interest Receivable On Loans Before Allowance On Credit Loss FinancingReceivableAfterInterestReceivableOnLoansBeforeAllowanceOnCreditLoss	1312903000	USD
CY2020Q3	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	18523000	USD
CY2020Q3	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	16354000	USD
CY2020Q3	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	5766000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	15712000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	15665000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	8097000	USD
CY2020Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	16049000	USD
CY2020Q3	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	23000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	18645000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	44000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	15715000	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	50000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	14111000	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	61000	USD
CY2020Q3	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	15726000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	18008000	USD
CY2020Q3	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	7000	USD
CY2020Q3	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	22415000	USD
CY2020Q3	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	1521113000	USD
CY2020Q3	chmg	Financing Receivable After Interest Receivable On Loans Before Allowance On Credit Loss FinancingReceivableAfterInterestReceivableOnLoansBeforeAllowanceOnCreditLoss	1543528000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	14370000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	1298533000	USD
CY2019Q4	chmg	Financing Receivable After Interest Receivable On Loans Before Allowance On Credit Loss FinancingReceivableAfterInterestReceivableOnLoansBeforeAllowanceOnCreditLoss	1312903000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	10800000	USD
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	9000000.0	USD
CY2020Q3	chmg	Financing Receivable Troubled Debt Restructuring Purchasedwith Credit Deterioration Increase FinancingReceivableTroubledDebtRestructuringPurchasedwithCreditDeteriorationIncrease	600000	USD
CY2019Q4	chmg	Financing Receivable Troubled Debt Restructuring Purchasedwith Credit Deterioration Increase FinancingReceivableTroubledDebtRestructuringPurchasedwithCreditDeteriorationIncrease	2300000	USD
CY2020Q3	chmg	Financing Receivable Modifications Recorded Investment Still Accruing FinancingReceivableModificationsRecordedInvestmentStillAccruing	2800000	USD
CY2020Q3	chmg	Financing Receivable Modifications Recorded Investment Nonaccrual Status FinancingReceivableModificationsRecordedInvestmentNonaccrualStatus	8000000.0	USD
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	5100000	USD
CY2019Q4	chmg	Financing Receivable Modifications Recorded Investment Still Accruing FinancingReceivableModificationsRecordedInvestmentStillAccruing	900000	USD
CY2019Q4	chmg	Financing Receivable Modifications Recorded Investment Nonaccrual Status FinancingReceivableModificationsRecordedInvestmentNonaccrualStatus	8100000	USD
CY2020Q3	chmg	Additional Amounts Committed To Customers With Loans Classified As Troubled Debt Restructurings AdditionalAmountsCommittedToCustomersWithLoansClassifiedAsTroubledDebtRestructurings	37000	USD
CY2019Q4	chmg	Additional Amounts Committed To Customers With Loans Classified As Troubled Debt Restructurings AdditionalAmountsCommittedToCustomersWithLoansClassifiedAsTroubledDebtRestructurings	17000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	3	loan
CY2020Q3	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	1458000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	1458000	USD
CY2020Q3	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0	USD
CY2019Q3	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	15	loan
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	5100000	USD
	us-gaap	Allowance For Loan And Lease Losses Period Increase Decrease AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease	142000	USD
	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	2	loan
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	4360000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	4360000	USD
	us-gaap	Allowance For Loan And Lease Losses Period Increase Decrease AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease	1700000	USD
	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	contract
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	contract
CY2019Q3	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	contract
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	contract
CY2020Q3	chmg	Financing Receivable After Interest Receivable On Loans Before Allowance On Credit Loss FinancingReceivableAfterInterestReceivableOnLoansBeforeAllowanceOnCreditLoss	1543528000	USD
CY2019Q4	chmg	Financing Receivable After Interest Receivable On Loans Before Allowance On Credit Loss FinancingReceivableAfterInterestReceivableOnLoansBeforeAllowanceOnCreditLoss	1312903000	USD
CY2020Q3	us-gaap	Fair Value Assets Level2 To Level1 Transfers Amount FairValueAssetsLevel2ToLevel1TransfersAmount	0	USD
CY2019Q3	us-gaap	Fair Value Assets Level2 To Level1 Transfers Amount FairValueAssetsLevel2ToLevel1TransfersAmount	0	USD
CY2020Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y6M
CY2020Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0339
CY2020Q3	us-gaap	Operating Lease Expense OperatingLeaseExpense	200000	USD
	us-gaap	Operating Lease Expense OperatingLeaseExpense	700000	USD
CY2020Q3	chmg	Operating Lease Right Of Use Asset Gross OperatingLeaseRightOfUseAssetGross	8713000	USD
CY2019Q4	chmg	Operating Lease Right Of Use Asset Gross OperatingLeaseRightOfUseAssetGross	8713000	USD
CY2020Q3	chmg	Operating Lease Right Of Use Asset Accumulated Amortization OperatingLeaseRightOfUseAssetAccumulatedAmortization	1239000	USD
CY2019Q4	chmg	Operating Lease Right Of Use Asset Accumulated Amortization OperatingLeaseRightOfUseAssetAccumulatedAmortization	712000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	7474000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	8001000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	233000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	930000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	869000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	889000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	880000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	5347000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	9148000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1564000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	7584000	USD
CY2020Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P12Y3M18D
CY2020Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0335
CY2020Q3	chmg	Finance Lease Right Of Use Asset Gross FinanceLeaseRightOfUseAssetGross	5572000	USD
CY2019Q4	chmg	Finance Lease Right Of Use Asset Gross FinanceLeaseRightOfUseAssetGross	5572000	USD
CY2020Q3	chmg	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	1791000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	200000	USD
CY2019Q4	chmg	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	1541000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	3781000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	4031000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	94000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	388000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	391000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	391000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	391000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	3250000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	4905000	USD
CY2020Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	995000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	3910000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	21824000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	21824000	USD
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2020Q3	us-gaap	Goodwill Goodwill	21824000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	21824000	USD
	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	11608000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	11237000	USD
CY2019	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	11608000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	10866000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	100000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	400000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	500000	USD
CY2020Q2	chmg	Proceeds From Participation Agreement ProceedsFromParticipationAgreement	461309	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	113000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	258000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	0	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	0	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	0	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	371000	USD
CY2020Q1	chmg	Participating Credit Facility Receivable Ownership Interest Amount ParticipatingCreditFacilityReceivableOwnershipInterestAmount	4200000	USD
CY2020Q1	chmg	Participating Credit Facility Receivable Amount ParticipatingCreditFacilityReceivableAmount	36000000.0	USD
CY2020Q1	us-gaap	Loss Contingency Damages Sought Value LossContingencyDamagesSoughtValue	4200000	USD
CY2020Q3	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-516000	USD
CY2020Q3	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-16000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-500000	USD
CY2019Q3	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	2662000	USD
CY2019Q3	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-13000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2675000	USD
	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	7389000	USD
	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-52000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7441000	USD
	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	8109000	USD
	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-26000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	8135000	USD
CY2020Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	57000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	5339000	USD
CY2019Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-10000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	4956000	USD
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-33000	USD
	us-gaap	Noninterest Income NoninterestIncome	15150000	USD
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	106000	USD
	us-gaap	Noninterest Income NoninterestIncome	14967000	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
CY2020Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	16714000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	845000	USD
CY2020Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	15869000	USD
CY2020Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	679000	USD
CY2020Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	15190000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	5339000	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	13362000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7167000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1456000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	5711000	USD
CY2019Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	16808000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	1666000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	15142000	USD
CY2019Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	4441000	USD
CY2019Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	10701000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	4956000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	13525000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2132000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	176000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	1956000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	49570000	USD
	us-gaap	Interest Expense InterestExpense	3048000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	46522000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	3989000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	42533000	USD
	us-gaap	Noninterest Income NoninterestIncome	15150000	USD
	us-gaap	Noninterest Expense NoninterestExpense	40339000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	17344000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3315000	USD
	us-gaap	Net Income Loss NetIncomeLoss	14029000	USD
CY2020Q3	us-gaap	Assets Assets	2165014000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	50155000	USD
	us-gaap	Interest Expense InterestExpense	4745000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	45410000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	5684000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	39726000	USD
	us-gaap	Noninterest Income NoninterestIncome	14967000	USD
	us-gaap	Noninterest Expense NoninterestExpense	40845000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	13848000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2443000	USD
	us-gaap	Net Income Loss NetIncomeLoss	11405000	USD
CY2019Q3	us-gaap	Assets Assets	1793643000	USD

Files In Submission

Name	View Source	Status
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0000763563-20-000094.txt	Edgar Link	pending
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$CHMG
Chemung Financial Corp Stock $chmg

2020 Q4 Form 10-Q Financial Statement

#000076356320000094 Filed on November 05, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CHMG Chemung Financial Corp Stock $chmg

2020 Q4 Form 10-Q Financial Statement

#000076356320000094 Filed on November 05, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CHMG
Chemung Financial Corp Stock $chmg