$CBU
Community Financial System Inc Stock $cbu

$cbu Overview Financials Valuation SEC Filings Company Website

2023 Q3 Form 10-Q Financial Statement

#000141057823001628 Filed on August 09, 2023

Income Statement

Concept	2023 Q3	2023 Q2	2022 Q2
Revenue	$137.6M	$131.6M	$106.2M
YoY Change	68678.0%	23.97%	11.34%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development	$15.48M	$14.29M	$13.61M
YoY Change	9.14%	5.0%	6.62%
% of Gross Profit
Depreciation & Amortization	$7.015M	$7.164M	$7.724M
YoY Change	-8.6%	-7.25%	4.38%
% of Gross Profit
Operating Expenses	$15.48M	$14.29M	$13.61M
YoY Change	15380.0%	5.0%	6.62%
Operating Profit
YoY Change
Interest Expense	$29.77M	$22.35M	$3.034M
YoY Change	443.15%	636.49%	-6.79%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$55.99M	$61.47M	$50.78M
YoY Change	-10.27%	21.07%	-18.58%
Income Tax	$11.86M	$13.18M	$10.97M
% Of Pretax Income	21.18%	21.44%	21.61%
Net Earnings	$44.13M	$48.29M	$39.81M
YoY Change	-9.37%	21.32%	-16.98%
Net Earnings / Revenue	32.08%	36.69%	37.49%
Basic Earnings Per Share	$0.82	$0.90	$0.74
Diluted Earnings Per Share	$0.82	$0.89	$738.1K
COMMON SHARES
Basic Shares Outstanding	53.53M	53.73M	53.91M
Diluted Shares Outstanding	53.61M	53.79M	54.22M

Balance Sheet

Concept	2023 Q3	2023 Q2	2022 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$455.8M	$222.8M	$197.6M
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	$174.7M	$158.4M	$169.0M
YoY Change	7.89%	-6.31%	4.97%
Goodwill	$845.4M	$844.0M	$849.8M
YoY Change	0.05%	-0.69%	14890.53%
Intangibles	$55.94M	$57.75M	$68.08M
YoY Change	-12.92%	-15.17%	42.48%
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$15.39B	$15.11B	$15.49B
YoY Change	-1.34%	-2.45%	4.64%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$153.5M	$134.1M	$155.9M
YoY Change	1.15%	-13.97%	-22.06%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$330.3M	$233.5M	$223.8M
YoY Change	-6.38%	4.34%	14.75%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$483.8M	$367.6M	$155.9M
YoY Change	218.76%	135.81%	-22.06%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$3.263M
YoY Change	-100.0%	-100.0%	8.77%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$0.00	$0.00	$3.263M
YoY Change	-100.0%	-100.0%	8.77%
TOTAL LIABILITIES
Total Short-Term Liabilities	$483.8M	$367.6M	$155.9M
Total Long-Term Liabilities	$0.00	$0.00	$3.263M
Total Liabilities	$13.83B	$13.49B	$13.83B
YoY Change	-2.14%	-2.43%	8.52%
SHAREHOLDERS EQUITY
Retained Earnings	$1.179B	$1.159B
YoY Change	4.94%
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$51.20M	$46.04M
YoY Change	93.74%
Treasury Stock Shares
Shareholders Equity	$1.555B	$1.617B	$1.662B
YoY Change
Total Liabilities & Shareholders Equity	$15.39B	$15.11B	$15.49B
YoY Change	-1.34%	-2.45%	4.64%

Cashflow Statement

Concept	2023 Q3	2023 Q2	2022 Q2
OPERATING ACTIVITIES
Net Income	$44.13M	$48.29M	$39.81M
YoY Change	-9.37%	21.32%	-16.98%
Depreciation, Depletion And Amortization	$7.015M	$7.164M	$7.724M
YoY Change	-8.6%	-7.25%	4.38%
Cash From Operating Activities	$64.86M	$41.48M	$46.98M
YoY Change	47.0%	-11.7%	78.62%
INVESTING ACTIVITIES
Capital Expenditures	$6.948M	$2.871M	-$2.765M
YoY Change	-237.99%	-203.83%	-42.4%
Acquisitions
YoY Change
Other Investing Activities	-$116.3M	$162.7M	-$338.6M
YoY Change	-58.12%	-148.04%	2251.56%
Cash From Investing Activities	-$123.2M	$159.8M	-$341.4M
YoY Change	-56.4%	-146.81%	1678.07%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	291.4M	-167.8M	-528.9M
YoY Change	1.07%	-68.27%	-1211.11%
NET CHANGE
Cash From Operating Activities	64.86M	41.48M	46.98M
Cash From Investing Activities	-123.2M	159.8M	-341.4M
Cash From Financing Activities	291.4M	-167.8M	-528.9M
Net Change In Cash	233.0M	33.48M	-823.3M
YoY Change	368.28%	-104.07%	-1605.12%
FREE CASH FLOW
Cash From Operating Activities	$64.86M	$41.48M	$46.98M
Capital Expenditures	$6.948M	$2.871M	-$2.765M
Free Cash Flow	$57.91M	$38.61M	$49.74M
YoY Change	17.81%	-22.38%	59.94%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2023Q2	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
	dei	Entity Central Index Key EntityCentralIndexKey	0000723188
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Entity Registrant Name EntityRegistrantName	COMMUNITY BANK SYSTEM, INC.
CY2023Q2	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#InterestReceivable
CY2023Q2	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List FinancingReceivableAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#InterestReceivable
CY2023Q2	cbu	Fair Value Liabilities Levels2 To Level1 Transfers Amount FairValueLiabilitiesLevels2ToLevel1TransfersAmount	0
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3	0
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3	0
	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	true
	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	true
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2023-06-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-13695
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	16-1213679
	dei	Entity Address Address Line1 EntityAddressAddressLine1	5790 Widewaters Parkway
	dei	Entity Address City Or Town EntityAddressCityOrTown	DeWitt
	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	13214
	dei	City Area Code CityAreaCode	315
	dei	Local Phone Number LocalPhoneNumber	445-2282
	dei	Security12b Title Security12bTitle	Common Stock, $1.00 par value per share
	dei	Trading Symbol TradingSymbol	CBU
	dei	Security Exchange Name SecurityExchangeName	NYSE
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2023Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	53526812
CY2023Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	222779000
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	209896000
CY2023Q2	cbu	Debt Securities Available For Sale Amortized Cost Pledged Amount DebtSecuritiesAvailableForSaleAmortizedCostPledgedAmount	597088000
CY2022Q4	cbu	Debt Securities Available For Sale Amortized Cost Pledged Amount DebtSecuritiesAvailableForSaleAmortizedCostPledgedAmount	466902000
CY2023Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Current DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossCurrent	3500726000
CY2022Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Current DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossCurrent	4675474000
CY2023Q2	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	3064870000
CY2022Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	4151851000
CY2023Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1063444000
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1034795000
CY2023Q2	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss Current DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossCurrent	1104020000
CY2022Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss Current DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLossCurrent	1079695000
CY2023Q2	cbu	Other Investments And Equity Securities At Cost OtherInvestmentsAndEquitySecuritiesAtCost	62141000
CY2022Q4	cbu	Other Investments And Equity Securities At Cost OtherInvestmentsAndEquitySecuritiesAtCost	82424000
CY2023Q2	cbu	Other Investment And Equity Securities Fair Value OtherInvestmentAndEquitySecuritiesFairValue	63009000
CY2022Q4	cbu	Other Investment And Equity Securities Fair Value OtherInvestmentAndEquitySecuritiesFairValue	83342000
CY2023Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	9170769000
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	8809394000
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	63284000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	61059000
CY2023Q2	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	9107485000
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	8748335000
CY2023Q2	us-gaap	Goodwill Goodwill	843960000
CY2022Q4	us-gaap	Goodwill Goodwill	841841000
CY2023Q2	cbu	Core Deposit Intangibles Net CoreDepositIntangiblesNet	10025000
CY2022Q4	cbu	Core Deposit Intangibles Net CoreDepositIntangiblesNet	12304000
CY2023Q2	cbu	Other Finite Lived Intangible Assets Net OtherFiniteLivedIntangibleAssetsNet	47724000
CY2022Q4	cbu	Other Finite Lived Intangible Assets Net OtherFiniteLivedIntangibleAssetsNet	48692000
CY2023Q2	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	901709000
CY2022Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	902837000
CY2023Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	158353000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	160778000
CY2023Q2	us-gaap	Interest Receivable InterestReceivable	46094000
CY2022Q4	us-gaap	Interest Receivable InterestReceivable	52613000
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CY2022Q4	us-gaap	Other Assets OtherAssets	446304000
CY2023Q2	us-gaap	Assets Assets	15108050000
CY2022Q4	us-gaap	Assets Assets	15835651000
CY2023Q2	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	3855085000
CY2022Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	4140617000
CY2023Q2	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	9016701000
CY2022Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	8871691000
CY2023Q2	us-gaap	Deposits Deposits	12871786000
CY2022Q4	us-gaap	Deposits Deposits	13012308000
CY2023Q2	cbu	Federal Home Loan Bank Overnight Advance FederalHomeLoanBankOvernightAdvance	234000000
CY2022Q4	cbu	Federal Home Loan Bank Overnight Advance FederalHomeLoanBankOvernightAdvance	768400000
CY2023Q2	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	233469000
CY2022Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	346652000
CY2023Q2	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	17284000
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	19474000
CY2023Q2	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	0
CY2022Q4	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	3249000
CY2023Q2	cbu	Accrued Interest And Other Liabilities AccruedInterestAndOtherLiabilities	134105000
CY2022Q4	cbu	Accrued Interest And Other Liabilities AccruedInterestAndOtherLiabilities	133863000
CY2023Q2	us-gaap	Liabilities Liabilities	13490644000
CY2022Q4	us-gaap	Liabilities Liabilities	14283946000
CY2023Q2	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1.00
CY2022Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1.00
CY2023Q2	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	500000
CY2022Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	500000
CY2023Q2	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
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CY2023Q2	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	0
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CY2022Q2	cbu	Interest Expense Borrowings Excluding Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust InterestExpenseBorrowingsExcludingJuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	304000
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CY2023Q2	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	0
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	us-gaap	Interest Expense InterestExpense	37197000
	us-gaap	Interest Expense InterestExpense	5858000
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	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	220309000
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CY2023Q2	cbu	Deposit Service Fees DepositServiceFees	15698000
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	cbu	Deposit Service Fees DepositServiceFees	30832000
	cbu	Deposit Service Fees DepositServiceFees	32293000
CY2023Q2	cbu	Mortgage Banking MortgageBanking	11000
CY2022Q2	cbu	Mortgage Banking MortgageBanking	269000
	cbu	Mortgage Banking MortgageBanking	286000
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CY2023Q2	cbu	Other Banking Services OtherBankingServices	2042000
CY2022Q2	cbu	Other Banking Services OtherBankingServices	870000
	cbu	Other Banking Services OtherBankingServices	3064000
	cbu	Other Banking Services OtherBankingServices	1609000
CY2023Q2	cbu	Employee Benefit Services EmployeeBenefitServices	28565000
CY2022Q2	cbu	Employee Benefit Services EmployeeBenefitServices	28921000
	cbu	Employee Benefit Services EmployeeBenefitServices	57949000
	cbu	Employee Benefit Services EmployeeBenefitServices	58501000
CY2023Q2	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	11860000
CY2022Q2	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	9780000
	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	23382000
	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	20189000
CY2023Q2	cbu	Wealth Management Services WealthManagementServices	7858000
CY2022Q2	cbu	Wealth Management Services WealthManagementServices	8141000
	cbu	Wealth Management Services WealthManagementServices	16103000
	cbu	Wealth Management Services WealthManagementServices	16774000
CY2023Q2	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0
CY2022Q2	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-52329000
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0
CY2023Q2	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0
CY2022Q2	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	242000
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0
CY2023Q2	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-50000
CY2022Q2	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-22000
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-50000
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-20000
CY2023Q2	us-gaap	Noninterest Income NoninterestIncome	65984000
CY2022Q2	us-gaap	Noninterest Income NoninterestIncome	64097000
	us-gaap	Noninterest Income NoninterestIncome	79479000
	us-gaap	Noninterest Income NoninterestIncome	129770000
CY2023Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	68034000
CY2022Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	65398000
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	139521000
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	127046000
CY2023Q2	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	14291000
CY2022Q2	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	13611000
	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	27420000
	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	26270000
CY2023Q2	us-gaap	Occupancy Net OccupancyNet	10453000
CY2022Q2	us-gaap	Occupancy Net OccupancyNet	10424000
	us-gaap	Occupancy Net OccupancyNet	21477000
	us-gaap	Occupancy Net OccupancyNet	21376000
CY2023Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3705000
CY2022Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3851000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7372000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7583000
CY2023Q2	us-gaap	Professional Fees ProfessionalFees	3102000
CY2022Q2	us-gaap	Professional Fees ProfessionalFees	3385000
	us-gaap	Professional Fees ProfessionalFees	8303000
	us-gaap	Professional Fees ProfessionalFees	7002000
CY2023Q2	us-gaap	Business Development BusinessDevelopment	4567000
CY2022Q2	us-gaap	Business Development BusinessDevelopment	3616000
	us-gaap	Business Development BusinessDevelopment	7468000
	us-gaap	Business Development BusinessDevelopment	6359000
CY2023Q2	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	-1000
CY2022Q2	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	3960000
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	56000
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	4259000
CY2023Q2	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	1000000
CY2022Q2	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	400000
	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	1000000
	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	400000
CY2023Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	7887000
CY2022Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	5779000
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	14473000
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	9936000
CY2023Q2	us-gaap	Noninterest Expense NoninterestExpense	113038000
CY2022Q2	us-gaap	Noninterest Expense NoninterestExpense	110424000
	us-gaap	Noninterest Expense NoninterestExpense	227090000
	us-gaap	Noninterest Expense NoninterestExpense	210231000
CY2023Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	61473000
CY2022Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	50776000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	68446000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	110608000
CY2023Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13182000
CY2022Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10971000
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14357000
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	23748000
CY2023Q2	us-gaap	Net Income Loss NetIncomeLoss	48291000
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	39805000
	us-gaap	Net Income Loss NetIncomeLoss	54089000
	us-gaap	Net Income Loss NetIncomeLoss	86860000
CY2023Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.90
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.74
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.00
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.61
CY2023Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.89
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.00
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.60
CY2023Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	549000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-220000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	1098000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-440000
CY2023Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	133000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-53000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	267000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-107000
CY2023Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	416000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-167000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	831000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-333000
CY2023Q2	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	160000
CY2022Q2	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	109000
	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	320000
	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	218000
CY2023Q2	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	39000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	27000
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	78000
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	53000
CY2023Q2	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	121000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	82000
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	242000
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	165000
CY2023Q2	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	295000
CY2022Q2	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-249000
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	589000
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-498000
CY2023Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-44039000
CY2022Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-260180000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	47221000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-618939000
CY2023Q2	cbu	Other Comprehensive Income Investment Securities Unrealized Holding Gain Loss Before Adjustment Tax OtherComprehensiveIncomeInvestmentSecuritiesUnrealizedHoldingGainLossBeforeAdjustmentTax	-10717000
CY2022Q2	cbu	Other Comprehensive Income Investment Securities Unrealized Holding Gain Loss Before Adjustment Tax OtherComprehensiveIncomeInvestmentSecuritiesUnrealizedHoldingGainLossBeforeAdjustmentTax	-63198000
	cbu	Other Comprehensive Income Investment Securities Unrealized Holding Gain Loss Before Adjustment Tax OtherComprehensiveIncomeInvestmentSecuritiesUnrealizedHoldingGainLossBeforeAdjustmentTax	11510000
	cbu	Other Comprehensive Income Investment Securities Unrealized Holding Gain Loss Before Adjustment Tax OtherComprehensiveIncomeInvestmentSecuritiesUnrealizedHoldingGainLossBeforeAdjustmentTax	-150341000
CY2023Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-33322000
CY2022Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-196982000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	35711000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-468598000
CY2023Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0
CY2022Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-52329000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0
CY2023Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0
CY2022Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-12714000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0
CY2023Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0
CY2022Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-39615000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0
CY2023Q2	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-33322000
CY2022Q2	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-196982000
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	75326000
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-468598000
CY2023Q2	cbu	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Including Cumulative Effect Of Change In Accounting Principle OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentIncludingCumulativeEffectOfChangeInAccountingPrinciple	-33617000
CY2022Q2	cbu	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Including Cumulative Effect Of Change In Accounting Principle OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentIncludingCumulativeEffectOfChangeInAccountingPrinciple	-196733000
	cbu	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Including Cumulative Effect Of Change In Accounting Principle OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentIncludingCumulativeEffectOfChangeInAccountingPrinciple	74737000
	cbu	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Including Cumulative Effect Of Change In Accounting Principle OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentIncludingCumulativeEffectOfChangeInAccountingPrinciple	-468100000
CY2023Q2	us-gaap	Net Income Loss NetIncomeLoss	48291000
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	39805000
	us-gaap	Net Income Loss NetIncomeLoss	54089000
	us-gaap	Net Income Loss NetIncomeLoss	86860000
CY2023Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	14674000
CY2022Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-156928000
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	128826000
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-381240000
CY2023Q2	cbu	Accumulated Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Gross Of Tax AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansGrossOfTax	42311000
CY2022Q4	cbu	Accumulated Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Gross Of Tax AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansGrossOfTax	41533000
CY2023Q2	cbu	Accumulated Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax Effect AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxEffect	-10421000
CY2022Q4	cbu	Accumulated Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax Effect AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxEffect	-10232000
CY2023Q2	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	31890000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	31301000
CY2023Q2	cbu	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Gross AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentGross	-765233000
CY2022Q4	cbu	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Gross AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentGross	-864783000
CY2023Q2	cbu	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Tax Effect AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTaxEffect	-185421000
CY2022Q4	cbu	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Tax Effect AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTaxEffect	-209645000
	us-gaap	Net Income Loss NetIncomeLoss	86860000
	us-gaap	Depreciation Depreciation	6544000
	us-gaap	Depreciation Depreciation	7373000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7372000
CY2023Q2	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-579812000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-655138000
CY2023Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-611702000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-686439000
CY2023Q1	us-gaap	Stockholders Equity StockholdersEquity	1634013000
CY2023Q2	us-gaap	Net Income Loss NetIncomeLoss	48291000
CY2023Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-33617000
CY2023Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.44
CY2023Q2	us-gaap	Dividends Common Stock DividendsCommonStock	23692000
CY2023Q2	cbu	Stock Issued During Period Value Employee Stock Ownership Plan Net Of Impact Of Net Settlement Of Tax Withholding Obligations StockIssuedDuringPeriodValueEmployeeStockOwnershipPlanNetOfImpactOfNetSettlementOfTaxWithholdingObligations	151000
CY2023Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1922000
CY2023Q2	cbu	Treasury Stock Value Acquired And Issued To Deferred Compensation Arrangements Cost Method TreasuryStockValueAcquiredAndIssuedToDeferredCompensationArrangementsCostMethod	9662000
CY2023Q2	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	0
CY2023Q2	us-gaap	Stockholders Equity StockholdersEquity	1617406000
CY2022Q1	us-gaap	Stockholders Equity StockholdersEquity	1852103000
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	39805000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-196733000
CY2022Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.43
CY2022Q2	us-gaap	Dividends Common Stock DividendsCommonStock	23248000
CY2022Q2	cbu	Stock Issued During Period Value Employee Stock Ownership Plan Net Of Impact Of Net Settlement Of Tax Withholding Obligations StockIssuedDuringPeriodValueEmployeeStockOwnershipPlanNetOfImpactOfNetSettlementOfTaxWithholdingObligations	314000
CY2022Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2304000
CY2022Q2	cbu	Stock Issued During Period Value Deferred Compensation Arrangements StockIssuedDuringPeriodValueDeferredCompensationArrangements	0
CY2022Q2	cbu	Treasury Stock Value Acquired And Issued To Deferred Compensation Arrangements Cost Method TreasuryStockValueAcquiredAndIssuedToDeferredCompensationArrangementsCostMethod	12849000
CY2022Q2	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	0
CY2022Q2	us-gaap	Stockholders Equity StockholdersEquity	1661696000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	1551705000
	us-gaap	Net Income Loss NetIncomeLoss	54089000
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	74737000
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.88
	us-gaap	Dividends Common Stock DividendsCommonStock	47415000
	cbu	Stock Issued During Period Value Employee Stock Ownership Plan Net Of Impact Of Net Settlement Of Tax Withholding Obligations StockIssuedDuringPeriodValueEmployeeStockOwnershipPlanNetOfImpactOfNetSettlementOfTaxWithholdingObligations	664000
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4194000
	cbu	Stock Issued During Period Value Deferred Compensation Arrangements StockIssuedDuringPeriodValueDeferredCompensationArrangements	0
	cbu	Treasury Stock Value Acquired And Issued To Deferred Compensation Arrangements Cost Method TreasuryStockValueAcquiredAndIssuedToDeferredCompensationArrangementsCostMethod	20568000
	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	0
CY2023Q2	us-gaap	Stockholders Equity StockholdersEquity	1617406000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	2100807000
	us-gaap	Net Income Loss NetIncomeLoss	86860000
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-468100000
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.86
	us-gaap	Dividends Common Stock DividendsCommonStock	46482000
	cbu	Stock Issued During Period Value Employee Stock Ownership Plan Net Of Impact Of Net Settlement Of Tax Withholding Obligations StockIssuedDuringPeriodValueEmployeeStockOwnershipPlanNetOfImpactOfNetSettlementOfTaxWithholdingObligations	799000
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4190000
	cbu	Stock Issued During Period Value Deferred Compensation Arrangements StockIssuedDuringPeriodValueDeferredCompensationArrangements	0
	cbu	Treasury Stock Value Acquired And Issued To Deferred Compensation Arrangements Cost Method TreasuryStockValueAcquiredAndIssuedToDeferredCompensationArrangementsCostMethod	16378000
	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	0
CY2022Q2	us-gaap	Stockholders Equity StockholdersEquity	1661696000
	us-gaap	Net Income Loss NetIncomeLoss	54089000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7583000
	cbu	Accretion Amortization On Investments Loans And Borrowings AccretionAmortizationOnInvestmentsLoansAndBorrowings	-1749000
	cbu	Accretion Amortization On Investments Loans And Borrowings AccretionAmortizationOnInvestmentsLoansAndBorrowings	9662000
	us-gaap	Share Based Compensation ShareBasedCompensation	4194000
	us-gaap	Share Based Compensation ShareBasedCompensation	4190000
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	242000
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	4252000
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	6944000
	us-gaap	Amortization Of Mortgage Servicing Rights Ms Rs AmortizationOfMortgageServicingRightsMSRs	452000
	us-gaap	Amortization Of Mortgage Servicing Rights Ms Rs AmortizationOfMortgageServicingRightsMSRs	299000
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-52329000
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-50000
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-20000
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1166000
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	944000
	cbu	Net Gain Loss On Sale Of Loans And Other Assets NetGainLossOnSaleOfLoansAndOtherAssets	1061000
	cbu	Net Gain Loss On Sale Of Loans And Other Assets NetGainLossOnSaleOfLoansAndOtherAssets	305000
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	9706000
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	3443000
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	118856000
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	98915000
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	394452000
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	86423000
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	24000
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	0
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	23823000
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	464000
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	733789000
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	0
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1348400000
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	9778000
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0
	cbu	Payments To Acquire Equity And Other Securities PaymentsToAcquireEquityAndOtherSecurities	3540000
	cbu	Payments To Acquire Equity And Other Securities PaymentsToAcquireEquityAndOtherSecurities	313000
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	373950000
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	335796000
	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0
	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	84988000
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	6376000
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-345000
	cbu	Proceeds From Sales Of Premises And Equipment Net ProceedsFromSalesOfPremisesAndEquipmentNet	4367000
	cbu	Proceeds From Sales Of Premises And Equipment Net ProceedsFromSalesOfPremisesAndEquipmentNet	483000
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	6941000
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5462000
	us-gaap	Payments For Proceeds From Real Estate Partnership Investment Net PaymentsForProceedsFromRealEstatePartnershipInvestmentNet	0
	us-gaap	Payments For Proceeds From Real Estate Partnership Investment Net PaymentsForProceedsFromRealEstatePartnershipInvestmentNet	247000
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	755870000
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1602503000
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-140522000
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-75691000
	cbu	Net Increase Decrease In Overnight Federal Reserve Bank Borrowings NetIncreaseDecreaseInOvernightFederalReserveBankBorrowings	-534400000
	cbu	Net Increase Decrease In Overnight Federal Reserve Bank Borrowings NetIncreaseDecreaseInOvernightFederalReserveBankBorrowings	66000000
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-113183000
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-100965000
	us-gaap	Increase Decrease In Loans From Other Federal Home Loan Banks IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks	-2239000
	us-gaap	Increase Decrease In Loans From Other Federal Home Loan Banks IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks	-33000
	cbu	Repayment Of Subordinate Notes Payable RepaymentOfSubordinateNotesPayable	3000000
	cbu	Repayment Of Subordinate Notes Payable RepaymentOfSubordinateNotesPayable	0
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	664000
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	799000
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	20679000
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	16498000
	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	111000
	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	120000
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	47442000
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	46453000
	cbu	Withholding Taxes Paid On Share Based Compensation WithholdingTaxesPaidOnShareBasedCompensation	1153000
	cbu	Withholding Taxes Paid On Share Based Compensation WithholdingTaxesPaidOnShareBasedCompensation	1127000
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-861843000
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-173848000
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	12883000
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-1677436000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	209896000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1875064000
CY2023Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	222779000
CY2022Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	197628000
	us-gaap	Interest Paid Net InterestPaidNet	36408000
	us-gaap	Interest Paid Net InterestPaidNet	5967000
	us-gaap	Income Taxes Paid IncomeTaxesPaid	18478000
	us-gaap	Income Taxes Paid IncomeTaxesPaid	25247000
CY2023Q2	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	23735000
CY2022Q2	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	23264000
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	232000
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	303000
	cbu	Transfer Of Property Plant And Equipment To Other Assets TransferOfPropertyPlantAndEquipmentToOtherAssets	1948000
	cbu	Transfer Of Property Plant And Equipment To Other Assets TransferOfPropertyPlantAndEquipmentToOtherAssets	0
	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	60000
	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	490623000
	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	9000
	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	543507000
CY2022Q2	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	170242000
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	337102000
CY2022Q2	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	43426000
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	92021000
	cbu	Business Combination Cash Consideration BusinessCombinationCashConsideration	6376000
CY2022	cbu	Business Combination Cash Consideration BusinessCombinationCashConsideration	85656000
CY2023Q2	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Cash And Equivalents BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents	0
CY2022Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Cash And Equivalents BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents	84988000
CY2023Q2	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Marketable Securities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities	0
CY2022Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Marketable Securities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities	11305000
CY2023Q2	cbu	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Loans Acquired BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAcquired	0
CY2022Q4	cbu	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Loans Acquired BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAcquired	436796000
CY2023Q2	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment	58000
CY2022Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment	11317000
CY2023Q2	cbu	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Accrued Interest And Fees Receivables BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestAndFeesReceivables	0
CY2022Q4	cbu	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Accrued Interest And Fees Receivables BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestAndFeesReceivables	882000
CY2023Q2	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Other Noncurrent Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets	2000
CY2022Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Other Noncurrent Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets	30337000
CY2023Q2	cbu	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposits Acquired BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositsAcquired	0
CY2022Q4	cbu	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposits Acquired BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositsAcquired	522295000
CY2023Q2	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Liabilities Other BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther	9000
CY2022Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Liabilities Other BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther	3630000
CY2023Q2	cbu	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Liabilities Other Federal Home Loan Bank Advances BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOtherFederalHomeLoanBankAdvances	0
CY2022Q4	cbu	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Liabilities Other Federal Home Loan Bank Advances BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOtherFederalHomeLoanBankAdvances	17616000
CY2023Q2	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	4176000
CY2022Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	43068000
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	100000
CY2022Q2	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	4000000.0
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	4300000
CY2023Q2	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	32500000
CY2023Q2	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	8500000
CY2023Q2	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1100000
CY2022Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	33300000
CY2022Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	8800000
CY2022Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1100000
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt 0pt 12pt 0pt;"><span style="font-style:italic;font-weight:bold;">Reclassifications</span></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;">Certain reclassifications have been made to prior period balances to conform to the current period’s presentation.</p>
CY2023Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	3500726000
	us-gaap	Available For Sale Debt Securities Gross Unrealized Gain AvailableForSaleDebtSecuritiesGrossUnrealizedGain	606000
	us-gaap	Available For Sale Debt Securities Gross Unrealized Loss AvailableForSaleDebtSecuritiesGrossUnrealizedLoss	436462000
CY2023Q2	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	3064870000
CY2022Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	4675474000
CY2022	us-gaap	Available For Sale Debt Securities Gross Unrealized Gain AvailableForSaleDebtSecuritiesGrossUnrealizedGain	565000
CY2022	us-gaap	Available For Sale Debt Securities Gross Unrealized Loss AvailableForSaleDebtSecuritiesGrossUnrealizedLoss	524188000
CY2022Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	4151851000
CY2023Q2	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	1104020000
CY2023Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	0
CY2023Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	40576000
CY2023Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1063444000
CY2022Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	1079695000
CY2022Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	0
CY2022Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	44900000
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1034795000
CY2023Q2	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	251000
CY2023Q2	cbu	Equity Securities Fv Ni Accumulated Gross Unrealized Gain Before Tax EquitySecuritiesFvNiAccumulatedGrossUnrealizedGainBeforeTax	118000
CY2023Q2	cbu	Equity Securities Fv Ni Accumulated Gross Unrealized Loss Before Tax EquitySecuritiesFvNiAccumulatedGrossUnrealizedLossBeforeTax	0
CY2023Q2	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	369000
CY2022Q4	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	251000
CY2022Q4	cbu	Equity Securities Fv Ni Accumulated Gross Unrealized Gain Before Tax EquitySecuritiesFvNiAccumulatedGrossUnrealizedGainBeforeTax	168000
CY2022Q4	cbu	Equity Securities Fv Ni Accumulated Gross Unrealized Loss Before Tax EquitySecuritiesFvNiAccumulatedGrossUnrealizedLossBeforeTax	0
CY2022Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	419000
CY2023Q2	cbu	Other Investments And Equity Securities At Cost OtherInvestmentsAndEquitySecuritiesAtCost	62141000
CY2023Q2	cbu	Other Investments And Equity Securities Accumulated Gross Unrealized Gain Before Tax OtherInvestmentsAndEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax	868000
CY2023Q2	cbu	Other Investments And Equity Securities Accumulated Gross Unrealized Loss Before Tax OtherInvestmentsAndEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0
CY2023Q2	cbu	Other Investment And Equity Securities Fair Value OtherInvestmentAndEquitySecuritiesFairValue	63009000
CY2022Q4	cbu	Other Investments And Equity Securities At Cost OtherInvestmentsAndEquitySecuritiesAtCost	82424000
CY2022Q4	cbu	Other Investments And Equity Securities Accumulated Gross Unrealized Gain Before Tax OtherInvestmentsAndEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax	918000
CY2022Q4	cbu	Other Investments And Equity Securities Accumulated Gross Unrealized Loss Before Tax OtherInvestmentsAndEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0
CY2022Q4	cbu	Other Investment And Equity Securities Fair Value OtherInvestmentAndEquitySecuritiesFairValue	83342000
CY2023Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	506
CY2023Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	197894000
CY2023Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	5818000
CY2023Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	1011
CY2023Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2766493000
CY2023Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	430644000
CY2023Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	1517
CY2023Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	2964387000
CY2023Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	436462000
CY2023Q2	cbu	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than12 Months HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThan12Months	29
CY2023Q2	cbu	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Less Than12 Months Fair Value DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsLessThan12MonthsFairValue	1063444000
CY2023Q2	cbu	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Less Than12 Months Accumulated Loss DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss	40576000
CY2023Q2	cbu	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions12 Months Or Longer HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions12MonthsOrLonger	0
CY2023Q2	cbu	Debt Securities Held To Maturity Continuous Unrealized Loss Positions12 Months Or Longer Fair Value DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositions12MonthsOrLongerFairValue	0
CY2023Q2	cbu	Debt Securities Held To Maturity Continuous Unrealized Loss Positions12 Months Or Longer Accumulated Loss DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositions12MonthsOrLongerAccumulatedLoss	0
CY2023Q2	cbu	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Position HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPosition	29
CY2023Q2	cbu	Debt Securities Held To Maturity Unrealized Loss Positions Fair Value DebtSecuritiesHeldToMaturityUnrealizedLossPositionsFairValue	1063444000
CY2023Q2	cbu	Debt Securities Held To Maturity Unrealized Loss Positions Accumulated Loss DebtSecuritiesHeldToMaturityUnrealizedLossPositionsAccumulatedLoss	40576000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	1149
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1955294000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	188107000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	430
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2106692000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	336081000
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	1579
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	4061986000
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	524188000
CY2022Q4	cbu	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than12 Months HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThan12Months	23
CY2022Q4	cbu	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Less Than12 Months Fair Value DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsLessThan12MonthsFairValue	1034795000
CY2022Q4	cbu	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Less Than12 Months Accumulated Loss DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss	44900000
CY2022Q4	cbu	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions12 Months Or Longer HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions12MonthsOrLonger	0
CY2022Q4	cbu	Debt Securities Held To Maturity Continuous Unrealized Loss Positions12 Months Or Longer Fair Value DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositions12MonthsOrLongerFairValue	0
CY2022Q4	cbu	Debt Securities Held To Maturity Continuous Unrealized Loss Positions12 Months Or Longer Accumulated Loss DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositions12MonthsOrLongerAccumulatedLoss	0
CY2022Q4	cbu	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Position HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPosition	23
CY2022Q4	cbu	Debt Securities Held To Maturity Unrealized Loss Positions Fair Value DebtSecuritiesHeldToMaturityUnrealizedLossPositionsFairValue	1034795000
CY2022Q4	cbu	Debt Securities Held To Maturity Unrealized Loss Positions Accumulated Loss DebtSecuritiesHeldToMaturityUnrealizedLossPositionsAccumulatedLoss	44900000
CY2023Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0
CY2023Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0
CY2023Q2	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	12700000
CY2023Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0
CY2023Q2	us-gaap	Accrued Fees And Other Revenue Receivable AccruedFeesAndOtherRevenueReceivable	4700000
CY2023Q2	us-gaap	Heldtomaturity Securities Debt Maturities Next Rolling Twelve Months Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost	0
CY2023Q2	us-gaap	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Fair Value HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	0
CY2023Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	170995000
CY2023Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	170364000
CY2023Q2	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Two Through Five Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCost	0
CY2023Q2	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Two Through Five Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	0
CY2023Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	1013648000
CY2023Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	909908000
CY2023Q2	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCost	546275000
CY2023Q2	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Six Through Ten Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	529303000
CY2023Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	1100527000
CY2023Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	972563000
CY2023Q2	us-gaap	Heldtomaturity Securities Debt Maturities Rolling After Ten Years Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingAfterTenYearsAmortizedCost	547992000
CY2023Q2	us-gaap	Held To Maturity Securities Debt Maturities Rolling After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue	524510000
CY2023Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	781766000
CY2023Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	636070000
CY2023Q2	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	1094267000
CY2023Q2	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	1053813000
CY2023Q2	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	3066936000
CY2023Q2	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	2688905000
CY2023Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss	1104020000
CY2023Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1063444000
CY2023Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	3500726000
CY2023Q2	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	3064870000
CY2023Q2	us-gaap	Debt Securities DebtSecurities	3450000000
CY2022Q4	us-gaap	Debt Securities DebtSecurities	2180000000
CY2023Q2	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	820000
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	63284000
CY2023Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	1001000
CY2023Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	9170769000
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	8809394000
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	63284000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	61059000
CY2023Q2	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	9107485000
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	8748335000
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0
CY2023Q2	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0
CY2023Q2	cbu	Impaired Financing Receivable With Related Allowance ImpairedFinancingReceivableWithRelatedAllowance	0
CY2022Q4	cbu	Impaired Financing Receivable With Related Allowance ImpairedFinancingReceivableWithRelatedAllowance	0
CY2023Q2	cbu	Impaired Financing Receivable Unpaid Principal Balance With No Related Allowance ImpairedFinancingReceivableUnpaidPrincipalBalanceWithNoRelatedAllowance	2490000
CY2022Q4	cbu	Impaired Financing Receivable Unpaid Principal Balance With No Related Allowance ImpairedFinancingReceivableUnpaidPrincipalBalanceWithNoRelatedAllowance	3163000
CY2023Q2	cbu	Impaired Financing Receivable Allowance ImpairedFinancingReceivableAllowance	2490000
CY2022Q4	cbu	Impaired Financing Receivable Allowance ImpairedFinancingReceivableAllowance	3163000
CY2023Q2	cbu	Impaired Financing Receivable Contractual Balance ImpairedFinancingReceivableContractualBalance	3648000
CY2022Q4	cbu	Impaired Financing Receivable Contractual Balance ImpairedFinancingReceivableContractualBalance	4201000
CY2023Q2	cbu	Impaired Financing Receivable Specifically Allocated Allowance ImpairedFinancingReceivableSpecificallyAllocatedAllowance	0
CY2022Q4	cbu	Impaired Financing Receivable Specifically Allocated Allowance ImpairedFinancingReceivableSpecificallyAllocatedAllowance	0
CY2023Q2	cbu	Impaired Financing Receivable Average Balances ImpairedFinancingReceivableAverageBalances	2500000
CY2022Q2	cbu	Impaired Financing Receivable Average Balances ImpairedFinancingReceivableAverageBalances	8700000
	cbu	Impaired Financing Receivable Average Balances ImpairedFinancingReceivableAverageBalances	3100000
	cbu	Impaired Financing Receivable Average Balances ImpairedFinancingReceivableAverageBalances	12200000
	cbu	Impaired Financing Receivable Interest Income ImpairedFinancingReceivableInterestIncome	0
CY2022Q2	cbu	Impaired Financing Receivable Interest Income ImpairedFinancingReceivableInterestIncome	0
	cbu	Impaired Financing Receivable Interest Income ImpairedFinancingReceivableInterestIncome	0
CY2023Q2	cbu	Impaired Financing Receivable Interest Income ImpairedFinancingReceivableInterestIncome	0
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	63170000
CY2023Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	2758000
CY2023Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	2052000
CY2023Q2	cbu	Off Balance Sheet Credit Loss Liability Charge Offs OffBalanceSheetCreditLossLiabilityChargeOffs	0
CY2023Q2	cbu	Off Balance Sheet Credit Loss Liability Recovery OffBalanceSheetCreditLossLiabilityRecovery	0
CY2023Q2	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-68000
CY2023Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	933000
CY2023Q1	cbu	Financing Receivable Allowance For Credit Loss Net FinancingReceivableAllowanceForCreditLossNet	64171000
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2758000
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2052000
CY2023Q2	cbu	Provision For Loan Lease And Other Losses Excluding Acquisition Related Provision For Credit Losses ProvisionForLoanLeaseAndOtherLossesExcludingAcquisitionRelatedProvisionForCreditLosses	752000
CY2023Q2	cbu	Financing Receivable Allowance For Credit Loss Net FinancingReceivableAllowanceForCreditLossNet	64217000
CY2022Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	50147000
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	2147000
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	1764000
CY2022Q2	cbu	Financing Receivable Allowance For Credit Loss Acquisitions FinancingReceivableAllowanceForCreditLossAcquisitions	71000
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	5707000
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	55542000
CY2022Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	892000
CY2022Q2	cbu	Off Balance Sheet Credit Loss Liability Charge Offs OffBalanceSheetCreditLossLiabilityChargeOffs	0
CY2022Q2	cbu	Off Balance Sheet Credit Loss Liability Recovery OffBalanceSheetCreditLossLiabilityRecovery	0
CY2022Q2	cbu	Off Balance Sheet Credit Loss Liability Pcd Allowance Acquisitions OffBalanceSheetCreditLossLiabilityPcdAllowanceAcquisitions	0
CY2022Q2	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	331000
CY2022Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	1223000
CY2022Q1	cbu	Financing Receivable Allowance For Credit Loss Net FinancingReceivableAllowanceForCreditLossNet	51039000
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2147000
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1764000
CY2022Q2	cbu	Financing Receivable Allowance For Credit Loss Acquisitions FinancingReceivableAllowanceForCreditLossAcquisitions	71000
CY2022Q2	cbu	Provision For Loan Lease And Other Losses Excluding Acquisition Related Provision For Credit Losses ProvisionForLoanLeaseAndOtherLossesExcludingAcquisitionRelatedProvisionForCreditLosses	6038000
CY2022Q2	cbu	Financing Receivable Allowance For Credit Loss Net FinancingReceivableAllowanceForCreditLossNet	56765000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	61059000
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	5988000
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	3771000
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	4442000
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	63284000
CY2022Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	1123000
	cbu	Off Balance Sheet Credit Loss Liability Charge Offs OffBalanceSheetCreditLossLiabilityChargeOffs	0
	cbu	Off Balance Sheet Credit Loss Liability Recovery OffBalanceSheetCreditLossLiabilityRecovery	0
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-190000
CY2023Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	933000
CY2022Q4	cbu	Financing Receivable Allowance For Credit Loss Net FinancingReceivableAllowanceForCreditLossNet	62182000
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	5988000
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	3771000
	cbu	Provision For Loan Lease And Other Losses Excluding Acquisition Related Provision For Credit Losses ProvisionForLoanLeaseAndOtherLossesExcludingAcquisitionRelatedProvisionForCreditLosses	4252000
CY2023Q2	cbu	Financing Receivable Allowance For Credit Loss Net FinancingReceivableAllowanceForCreditLossNet	64217000
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	49869000
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	4303000
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	3381000
	cbu	Financing Receivable Allowance For Credit Loss Acquisitions FinancingReceivableAllowanceForCreditLossAcquisitions	71000
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	6524000
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	55542000
CY2021Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	803000
	cbu	Off Balance Sheet Credit Loss Liability Charge Offs OffBalanceSheetCreditLossLiabilityChargeOffs	0
	cbu	Off Balance Sheet Credit Loss Liability Recovery OffBalanceSheetCreditLossLiabilityRecovery	0
	cbu	Off Balance Sheet Credit Loss Liability Pcd Allowance Acquisitions OffBalanceSheetCreditLossLiabilityPcdAllowanceAcquisitions	0
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	420000
CY2022Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	1223000
CY2021Q4	cbu	Financing Receivable Allowance For Credit Loss Net FinancingReceivableAllowanceForCreditLossNet	50672000
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	4303000
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	3381000
	cbu	Financing Receivable Allowance For Credit Loss Acquisitions FinancingReceivableAllowanceForCreditLossAcquisitions	71000
	cbu	Provision For Loan Lease And Other Losses Excluding Acquisition Related Provision For Credit Losses ProvisionForLoanLeaseAndOtherLossesExcludingAcquisitionRelatedProvisionForCreditLosses	6944000
CY2022Q2	cbu	Financing Receivable Allowance For Credit Loss Net FinancingReceivableAllowanceForCreditLossNet	56765000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	61100000
CY2023Q2	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	25000000.0
	us-gaap	Financing Receivable Sale FinancingReceivableSale	1800000
	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	436900000
	us-gaap	Financing Receivable Sale FinancingReceivableSale	3700000
CY2023Q2	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	201311000
CY2023Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	143562000
CY2023Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	57749000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	197186000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	136190000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	60996000
CY2023Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	6988000
CY2023Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	12435000
CY2023Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	10603000
CY2023Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	9350000
CY2023Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	3823000
CY2023Q2	cbu	Finite Lived Intangible Asset Expected Amortization After Year Four FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour	14550000
CY2023Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	57749000
CY2022Q4	us-gaap	Goodwill Gross GoodwillGross	841841000
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	2119000
CY2023Q2	us-gaap	Goodwill Gross GoodwillGross	843960000
CY2023Q2	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	4300000
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	200000
CY2023Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	200000
CY2022Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	400000
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	300000
CY2023Q2	us-gaap	Net Income Loss NetIncomeLoss	48291000
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	39805000
	us-gaap	Net Income Loss NetIncomeLoss	54089000
	us-gaap	Net Income Loss NetIncomeLoss	86860000
CY2023Q2	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	-192000
CY2022Q2	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	-125000
	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	-186000
	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	-252000
CY2023Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	48099000
CY2022Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	39680000
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	53903000
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	86608000
CY2023Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53679000
CY2022Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53928000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53760000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53958000
CY2023Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.90
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.74
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.00
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.61
CY2023Q2	us-gaap	Net Income Loss NetIncomeLoss	48291000
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	39805000
	us-gaap	Net Income Loss NetIncomeLoss	54089000
	us-gaap	Net Income Loss NetIncomeLoss	86860000
CY2023Q2	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	-192000
CY2022Q2	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	-125000
	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	-186000
	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	-252000
CY2023Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	48099000
CY2022Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	39680000
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	53903000
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	86608000
CY2023Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53679000
CY2022Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53928000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53760000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53958000
CY2023Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	115000
CY2022Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	293000
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	152000
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	341000
CY2023Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	53794000
CY2022Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54221000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	53912000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54299000
CY2023Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.89
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.00
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.60
CY2022Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	2697000
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	400000
CY2023Q2	cbu	Treasury Stock Shares Acquired Price Per Share TreasuryStockSharesAcquiredPricePerShare	51.42
CY2021Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	2697000
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	250000
CY2022Q2	cbu	Treasury Stock Shares Acquired Price Per Share TreasuryStockSharesAcquiredPricePerShare	65.51
CY2023Q2	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	1508984000
CY2022Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	1544138000
CY2023Q2	cbu	Fair Value Liabilities Levels1 To Level2 Transfers Amount FairValueLiabilitiesLevels1ToLevel2TransfersAmount	0
CY2023Q2	cbu	Mortgages Held For Sale Unpaid Principal Value MortgagesHeldForSaleUnpaidPrincipalValue	1400000
CY2022Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	0
CY2023Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	109279000
CY2023Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	752000
CY2023Q2	us-gaap	Noninterest Income NoninterestIncome	65984000
CY2023Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3705000
CY2023Q2	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	-1000
CY2023Q2	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	1000000
CY2023Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	108334000
CY2023Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	61473000
CY2023Q2	us-gaap	Assets Assets	15108050000
CY2023Q2	us-gaap	Goodwill Goodwill	843960000
CY2023Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	57749000
CY2022Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	103141000
CY2022Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	6038000
CY2022Q2	us-gaap	Noninterest Income NoninterestIncome	64097000
CY2022Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3851000
CY2022Q2	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	3960000
CY2022Q2	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	400000
CY2022Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	102213000
CY2022Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	50776000
CY2022Q2	us-gaap	Assets Assets	15487833000
CY2022Q2	us-gaap	Goodwill Goodwill	849813000
CY2022Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	68078000
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	220309000
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	4252000
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-52329000
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	242000
	cbu	Non Interest Income Expenses Other Revenues NonInterestIncomeExpensesOtherRevenues	131566000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7372000
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	56000
	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	1000000
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	218662000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	68446000
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	198013000
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	6944000
	us-gaap	Noninterest Income NoninterestIncome	129770000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7583000
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	4259000
	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	400000
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	197989000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	110608000

Files In Submission

Name	View Source	Status
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0001410578-23-001628-index.html	Edgar Link	pending
0001410578-23-001628.txt	Edgar Link	pending
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cbu-20230630x10q.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending
cbu-20230630_pre.xml	Edgar Link	unprocessable

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$CBU
Community Financial System Inc Stock $cbu

2023 Q3 Form 10-Q Financial Statement

#000141057823001628 Filed on August 09, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBU Community Financial System Inc Stock $cbu

2023 Q3 Form 10-Q Financial Statement

#000141057823001628 Filed on August 09, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBU
Community Financial System Inc Stock $cbu