$CBU
Community Financial System Inc Stock $cbu

$cbu Overview Financials Valuation SEC Filings Company Website

2023 Q2 Form 10-Q Financial Statement

#000141057823000973 Filed on May 10, 2023

Income Statement

Concept	2023 Q2	2023 Q1
Revenue	$131.6M	$125.9M
YoY Change	23.97%	41860.67%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development	$14.29M	$13.13M
YoY Change	5.0%	3.71%
% of Gross Profit
Depreciation & Amortization	$7.164M	$3.304M
YoY Change	-7.25%	-10.46%
% of Gross Profit
Operating Expenses	$14.29M	$13.13M
YoY Change	5.0%	13029.0%
Operating Profit
YoY Change
Interest Expense	$22.35M	$14.85M
YoY Change	636.49%	425.92%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$61.47M	$6.973M
YoY Change	21.07%	-88.35%
Income Tax	$13.18M	$1.175M
% Of Pretax Income	21.44%	16.85%
Net Earnings	$48.29M	$5.798M
YoY Change	21.32%	-87.68%
Net Earnings / Revenue	36.69%	4.61%
Basic Earnings Per Share	$0.90	$0.11
Diluted Earnings Per Share	$0.89	$0.11
COMMON SHARES
Basic Shares Outstanding	53.73M	53.77M
Diluted Shares Outstanding	53.79M	54.05M

Balance Sheet

Concept	2023 Q2	2023 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$222.8M	$189.3M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$158.4M	$158.6M
YoY Change	-6.31%	0.1%
Goodwill	$844.0M	$842.9M
YoY Change	-0.69%	5.49%
Intangibles	$57.75M	$57.98M
YoY Change	-15.17%	-9.35%
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	$15.11B	$15.26B
YoY Change	-2.45%	-2.37%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$134.1M	$131.0M
YoY Change	-13.97%	-12.94%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$233.5M	$304.6M
YoY Change	4.34%	1.36%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$367.6M	$435.6M
YoY Change	135.81%	189.52%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00
YoY Change	-100.0%	-100.0%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$0.00	$0.00
YoY Change	-100.0%	-100.0%
TOTAL LIABILITIES
Total Short-Term Liabilities	$367.6M	$435.6M
Total Long-Term Liabilities	$0.00	$0.00
Total Liabilities	$13.49B	$13.62B
YoY Change	-2.43%	-1.1%
SHAREHOLDERS EQUITY
Retained Earnings	$1.159B	$1.135B
YoY Change		4.84%
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$46.04M	$36.33M
YoY Change		169.79%
Treasury Stock Shares
Shareholders Equity	$1.617B	$1.634B
YoY Change
Total Liabilities & Shareholders Equity	$15.11B	$15.26B
YoY Change	-2.45%	-2.37%

Cashflow Statement

Concept	2023 Q2	2023 Q1
OPERATING ACTIVITIES
Net Income	$48.29M	$5.798M
YoY Change	21.32%	-87.68%
Depreciation, Depletion And Amortization	$7.164M	$3.304M
YoY Change	-7.25%	-10.46%
Cash From Operating Activities	$41.48M	$77.37M
YoY Change	-11.7%	48.97%
INVESTING ACTIVITIES
Capital Expenditures	$2.871M	$4.070M
YoY Change	-203.83%	83.83%
Acquisitions		$2.061M
YoY Change		-16.36%
Other Investing Activities	$162.7M	$600.1M
YoY Change	-148.04%	-147.67%
Cash From Investing Activities	$159.8M	$596.1M
YoY Change	-146.81%	-147.27%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-167.8M	-694.0M
YoY Change	-68.27%	-295.48%
NET CHANGE
Cash From Operating Activities	41.48M	77.37M
Cash From Investing Activities	159.8M	596.1M
Cash From Financing Activities	-167.8M	-694.0M
Net Change In Cash	33.48M	-20.60M
YoY Change	-104.07%	-97.59%
FREE CASH FLOW
Cash From Operating Activities	$41.48M	$77.37M
Capital Expenditures	$2.871M	$4.070M
Free Cash Flow	$38.61M	$73.30M
YoY Change	-22.38%	47.42%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2023Q1	us-gaap	Professional Fees ProfessionalFees	5201000
CY2022Q1	us-gaap	Professional Fees ProfessionalFees	3617000
CY2023Q1	us-gaap	Business Development BusinessDevelopment	2901000
CY2022Q1	us-gaap	Business Development BusinessDevelopment	2743000
CY2023Q1	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	57000
CY2022Q1	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	299000
CY2023Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	6586000
CY2022Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	4157000
CY2022Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	906000
CY2023Q1	us-gaap	Amortization Of Mortgage Servicing Rights Ms Rs AmortizationOfMortgageServicingRightsMSRs	233000
CY2022Q1	us-gaap	Amortization Of Mortgage Servicing Rights Ms Rs AmortizationOfMortgageServicingRightsMSRs	109000
CY2023Q1	cbu	Repayment Of Subordinate Notes Payable RepaymentOfSubordinateNotesPayable	3000000
CY2022Q1	cbu	Repayment Of Subordinate Notes Payable RepaymentOfSubordinateNotesPayable	0
CY2023Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	513000
CY2022Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	485000
CY2023Q1	us-gaap	Financing Receivable Sale FinancingReceivableSale	500000
CY2023Q1	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	-17000
CY2022Q1	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	-119000
CY2023Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5781000
CY2023Q1	cbu	Other Investments And Equity Securities At Cost OtherInvestmentsAndEquitySecuritiesAtCost	53595000
CY2022Q4	cbu	Other Investments And Equity Securities At Cost OtherInvestmentsAndEquitySecuritiesAtCost	82424000
CY2023Q1	cbu	Other Investment And Equity Securities Fair Value OtherInvestmentAndEquitySecuritiesFairValue	54513000
CY2022Q4	cbu	Other Investment And Equity Securities Fair Value OtherInvestmentAndEquitySecuritiesFairValue	83342000
CY2023Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	8982335000
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	8809394000
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	63170000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	61059000
CY2023Q1	us-gaap	Notes Receivable Net NotesReceivableNet	8919165000
CY2022Q4	us-gaap	Notes Receivable Net NotesReceivableNet	8748335000
CY2023Q1	us-gaap	Goodwill Goodwill	842936000
CY2022Q4	us-gaap	Goodwill Goodwill	841841000
CY2023Q1	cbu	Core Deposit Intangibles Net CoreDepositIntangiblesNet	11108000
CY2022Q4	cbu	Core Deposit Intangibles Net CoreDepositIntangiblesNet	12304000
CY2023Q1	cbu	Other Finite Lived Intangible Assets Net OtherFiniteLivedIntangibleAssetsNet	46870000
CY2022Q4	cbu	Other Finite Lived Intangible Assets Net OtherFiniteLivedIntangibleAssetsNet	48692000
CY2023Q1	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	900914000
CY2022Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	902837000
CY2023Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	158562000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	160778000
CY2023Q1	us-gaap	Interest Receivable InterestReceivable	42476000
CY2022Q4	us-gaap	Interest Receivable InterestReceivable	52613000
CY2023Q1	us-gaap	Other Assets OtherAssets	414797000
CY2022Q4	us-gaap	Other Assets OtherAssets	446304000
CY2023Q1	us-gaap	Assets Assets	15255953000
CY2022Q4	us-gaap	Assets Assets	15835651000
CY2023Q1	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	3949801000
CY2022Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	4140617000
CY2023Q1	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	9160871000
CY2022Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	8871691000
CY2023Q1	us-gaap	Deposits Deposits	13110672000
CY2022Q4	us-gaap	Deposits Deposits	13012308000
CY2023Q1	cbu	Federal Home Loan Bank Overnight Advance FederalHomeLoanBankOvernightAdvance	58400000
CY2023Q1	dei	Trading Symbol TradingSymbol	CBU
CY2023Q1	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2023Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2023Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023Q1	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	53728786
CY2023Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	189298000
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	209896000
CY2023Q1	cbu	Debt Securities Available For Sale Amortized Cost Pledged Amount DebtSecuritiesAvailableForSaleAmortizedCostPledgedAmount	640396000
CY2022Q4	cbu	Debt Securities Available For Sale Amortized Cost Pledged Amount DebtSecuritiesAvailableForSaleAmortizedCostPledgedAmount	466902000
CY2023Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss	3871881000
CY2022Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss	4675474000
CY2023Q1	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	3485993000
CY2022Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	4151851000
CY2023Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1083330000
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1034795000
CY2023Q1	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	1090235000
CY2022Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	1079695000
CY2022Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3732000
CY2023Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2023Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000723188
CY2023Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2023Q1	dei	Entity Registrant Name EntityRegistrantName	COMMUNITY BANK SYSTEM, INC.
CY2023Q1	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/2022#InterestReceivable
CY2023Q1	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List FinancingReceivableAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#InterestReceivable
CY2023Q1	cbu	Fair Value Liabilities Levels2 To Level1 Transfers Amount FairValueLiabilitiesLevels2ToLevel1TransfersAmount	0
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3	0
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3	0
CY2023Q1	dei	Amendment Flag AmendmentFlag	false
CY2023Q1	dei	Document Type DocumentType	10-Q
CY2023Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2023Q1	dei	Document Period End Date DocumentPeriodEndDate	2023-03-31
CY2023Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2023Q1	dei	Entity File Number EntityFileNumber	001-13695
CY2023Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	16-1213679
CY2023Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	5790 Widewaters Parkway
CY2023Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	DeWitt
CY2023Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2023Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	13214
CY2023Q1	dei	City Area Code CityAreaCode	315
CY2023Q1	dei	Local Phone Number LocalPhoneNumber	445-2282
CY2023Q1	dei	Security12b Title Security12bTitle	Common Stock, $1.00 par value per share
CY2022Q4	cbu	Federal Home Loan Bank Overnight Advance FederalHomeLoanBankOvernightAdvance	768400000
CY2023Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	304607000
CY2022Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	346652000
CY2023Q1	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	17284000
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	19474000
CY2023Q1	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	0
CY2022Q4	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	3249000
CY2023Q1	cbu	Accrued Interest And Other Liabilities AccruedInterestAndOtherLiabilities	130977000
CY2022Q4	cbu	Accrued Interest And Other Liabilities AccruedInterestAndOtherLiabilities	133863000
CY2023Q1	us-gaap	Liabilities Liabilities	13621940000
CY2022Q4	us-gaap	Liabilities Liabilities	14283946000
CY2023Q1	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
CY2023Q1	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	500000
CY2022Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	500000
CY2023Q1	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2022Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2023Q1	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	0
CY2022Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	0
CY2023Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.00
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.00
CY2023Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	75000000
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	75000000
CY2023Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	54359535
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	54190201
CY2023Q1	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	54360000
CY2022Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	54190000
CY2023Q1	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1052802000
CY2022Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1050231000
CY2023Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1134527000
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1152452000
CY2023Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-578085000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-686439000
CY2023Q1	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	634618
CY2023Q1	us-gaap	Deferred Compensation Arrangement With Individual Common Stock Reserved For Future Issuance DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance	117103
CY2022Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	452952
CY2022Q4	us-gaap	Deferred Compensation Arrangement With Individual Common Stock Reserved For Future Issuance DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance	135437
CY2023Q1	us-gaap	Treasury Stock Value TreasuryStockValue	36325000
CY2022Q4	us-gaap	Treasury Stock Value TreasuryStockValue	26485000
CY2023Q1	us-gaap	Deferred Compensation Arrangement With Individual Common Stock Reserved For Future Issuance DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance	117103
CY2022Q4	us-gaap	Deferred Compensation Arrangement With Individual Common Stock Reserved For Future Issuance DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance	135437
CY2023Q1	us-gaap	Deferred Compensation Arrangement With Individual Recorded Liability DeferredCompensationArrangementWithIndividualRecordedLiability	6734000
CY2022Q4	us-gaap	Deferred Compensation Arrangement With Individual Recorded Liability DeferredCompensationArrangementWithIndividualRecordedLiability	7756000
CY2023Q1	us-gaap	Stockholders Equity StockholdersEquity	1634013000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	1551705000
CY2023Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	15255953000
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	15835651000
CY2023Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	100362000
CY2022Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	72514000
CY2023Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	21938000
CY2022Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	22592000
CY2023Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	3582000
CY2022Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	2590000
CY2023Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	125882000
CY2022Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	97696000
CY2023Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	9928000
CY2022Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	2565000
CY2023Q1	cbu	Interest Expense Borrowings Excluding Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust InterestExpenseBorrowingsExcludingJuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	4886000
CY2022Q1	cbu	Interest Expense Borrowings Excluding Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust InterestExpenseBorrowingsExcludingJuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	221000
CY2023Q1	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	38000
CY2022Q1	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	38000
CY2023Q1	us-gaap	Interest Expense InterestExpense	14852000
CY2022Q1	us-gaap	Interest Expense InterestExpense	2824000
CY2023Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	111030000
CY2022Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	94872000
CY2023Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3500000
CY2022Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	906000
CY2023Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	107530000
CY2022Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	93966000
CY2023Q1	cbu	Deposit Service Fees DepositServiceFees	15134000
CY2022Q1	cbu	Deposit Service Fees DepositServiceFees	16155000
CY2023Q1	cbu	Mortgage Banking MortgageBanking	275000
CY2022Q1	cbu	Mortgage Banking MortgageBanking	155000
CY2023Q1	cbu	Other Banking Services OtherBankingServices	1022000
CY2022Q1	cbu	Other Banking Services OtherBankingServices	739000
CY2023Q1	cbu	Employee Benefit Services EmployeeBenefitServices	29384000
CY2022Q1	cbu	Employee Benefit Services EmployeeBenefitServices	29580000
CY2023Q1	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	11522000
CY2022Q1	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	10409000
CY2023Q1	cbu	Wealth Management Services WealthManagementServices	8245000
CY2022Q1	cbu	Wealth Management Services WealthManagementServices	8633000
CY2023Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-52329000
CY2022Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0
CY2023Q1	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	242000
CY2022Q1	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0
CY2023Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	0
CY2022Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	2000
CY2023Q1	us-gaap	Noninterest Income NoninterestIncome	13495000
CY2022Q1	us-gaap	Noninterest Income NoninterestIncome	65673000
CY2023Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	71487000
CY2022Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	61648000
CY2023Q1	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	13129000
CY2022Q1	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	12659000
CY2023Q1	us-gaap	Occupancy Net OccupancyNet	11024000
CY2022Q1	us-gaap	Occupancy Net OccupancyNet	10952000
CY2023Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3667000
CY2023Q1	us-gaap	Noninterest Expense NoninterestExpense	114052000
CY2022Q1	us-gaap	Noninterest Expense NoninterestExpense	99807000
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	6973000
CY2022Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	59832000
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1175000
CY2022Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12777000
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	5798000
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	47055000
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.11
CY2022Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.87
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.11
CY2022Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.86
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	549000
CY2022Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-220000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	134000
CY2022Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-54000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	415000
CY2022Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-166000
CY2023Q1	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
CY2022Q1	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
CY2023Q1	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
CY2022Q1	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	26000
CY2023Q1	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
CY2022Q1	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	83000
CY2023Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	294000
CY2022Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-249000
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	91260000
CY2022Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-358759000
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	22227000
CY2022Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-87143000
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	69033000
CY2022Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-271616000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-52329000
CY2022Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-12714000
CY2022Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-39615000
CY2022Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0
CY2023Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	108648000
CY2022Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-271616000
CY2023Q1	cbu	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Including Cumulative Effect Of Change In Accounting Principle OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentIncludingCumulativeEffectOfChangeInAccountingPrinciple	108354000
CY2022Q1	cbu	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Including Cumulative Effect Of Change In Accounting Principle OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentIncludingCumulativeEffectOfChangeInAccountingPrinciple	-271367000
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	5798000
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	47055000
CY2023Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	114152000
CY2022Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-224312000
CY2023Q1	cbu	Accumulated Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Gross Of Tax AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansGrossOfTax	41922000
CY2022Q4	cbu	Accumulated Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Gross Of Tax AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansGrossOfTax	41533000
CY2023Q1	cbu	Accumulated Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax Effect AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxEffect	-10327000
CY2022Q4	cbu	Accumulated Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax Effect AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxEffect	-10232000
CY2023Q1	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	31595000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	31301000
CY2023Q1	cbu	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Gross AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentGross	-721194000
CY2022Q4	cbu	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Gross AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentGross	-864783000
CY2023Q1	cbu	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Tax Effect AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTaxEffect	-174704000
CY2022Q4	cbu	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Tax Effect AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTaxEffect	-209645000
CY2023Q1	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-546490000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-655138000
CY2023Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-578085000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-686439000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	1551705000
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	5798000
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	108354000
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.44
CY2023Q1	us-gaap	Dividends Common Stock DividendsCommonStock	23723000
CY2023Q1	cbu	Stock Issued During Period Value Employee Stock Ownership Plan Net Of Impact Of Net Settlement Of Tax Withholding Obligations StockIssuedDuringPeriodValueEmployeeStockOwnershipPlanNetOfImpactOfNetSettlementOfTaxWithholdingObligations	513000
CY2023Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2272000
CY2023Q1	cbu	Stock Issued During Period Value Deferred Compensation Arrangements StockIssuedDuringPeriodValueDeferredCompensationArrangements	0
CY2023Q1	cbu	Treasury Stock Value Acquired And Issued To Deferred Compensation Arrangements Cost Method TreasuryStockValueAcquiredAndIssuedToDeferredCompensationArrangementsCostMethod	10906000
CY2023Q1	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	0
CY2023Q1	us-gaap	Stockholders Equity StockholdersEquity	1634013000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	2100807000
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	47055000
CY2022Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-271367000
CY2022Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.43
CY2022Q1	us-gaap	Dividends Common Stock DividendsCommonStock	23234000
CY2022Q1	cbu	Stock Issued During Period Value Employee Stock Ownership Plan Net Of Impact Of Net Settlement Of Tax Withholding Obligations StockIssuedDuringPeriodValueEmployeeStockOwnershipPlanNetOfImpactOfNetSettlementOfTaxWithholdingObligations	485000
CY2022Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1886000
CY2022Q1	cbu	Stock Issued During Period Value Deferred Compensation Arrangements StockIssuedDuringPeriodValueDeferredCompensationArrangements	0
CY2022Q1	cbu	Treasury Stock Value Acquired And Issued To Deferred Compensation Arrangements Cost Method TreasuryStockValueAcquiredAndIssuedToDeferredCompensationArrangementsCostMethod	3529000
CY2022Q1	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	0
CY2022Q1	us-gaap	Stockholders Equity StockholdersEquity	1852103000
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	5798000
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	47055000
CY2023Q1	us-gaap	Depreciation Depreciation	3304000
CY2022Q1	us-gaap	Depreciation Depreciation	3690000
CY2023Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3667000
CY2022Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3732000
CY2023Q1	cbu	Accretion Amortization On Investments Loans And Borrowings AccretionAmortizationOnInvestmentsLoansAndBorrowings	-508000
CY2022Q1	cbu	Accretion Amortization On Investments Loans And Borrowings AccretionAmortizationOnInvestmentsLoansAndBorrowings	4547000
CY2023Q1	us-gaap	Share Based Compensation ShareBasedCompensation	2272000
CY2022Q1	us-gaap	Share Based Compensation ShareBasedCompensation	1886000
CY2023Q1	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	242000
CY2022Q1	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0
CY2023Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3500000
CY2023Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-52329000
CY2022Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0
CY2023Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	0
CY2022Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	2000
CY2023Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	587000
CY2022Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	440000
CY2023Q1	cbu	Net Gain Loss On Sale Of Loans And Other Assets NetGainLossOnSaleOfLoansAndOtherAssets	399000
CY2022Q1	cbu	Net Gain Loss On Sale Of Loans And Other Assets NetGainLossOnSaleOfLoansAndOtherAssets	450000
CY2023Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-6991000
CY2022Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	1000
CY2023Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	77374000
CY2022Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	51938000
CY2023Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	20543000
CY2022Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	49667000
CY2023Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	10000
CY2022Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	0
CY2023Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	32148000
CY2022Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	460000
CY2023Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	733789000
CY2022Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0
CY2023Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	0
CY2022Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1256723000
CY2023Q1	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	3310000
CY2022Q1	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0
CY2023Q1	cbu	Payments To Acquire Equity And Other Securities PaymentsToAcquireEquityAndOtherSecurities	3319000
CY2022Q1	cbu	Payments To Acquire Equity And Other Securities PaymentsToAcquireEquityAndOtherSecurities	37000
CY2023Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	179292000
CY2022Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	49556000
CY2023Q1	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0
CY2022Q1	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0
CY2023Q1	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2061000
CY2022Q1	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2464000
CY2023Q1	cbu	Proceeds From Sales Of Premises And Equipment Net ProceedsFromSalesOfPremisesAndEquipmentNet	1634000
CY2022Q1	cbu	Proceeds From Sales Of Premises And Equipment Net ProceedsFromSalesOfPremisesAndEquipmentNet	368000
CY2023Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	4070000
CY2022Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2582000
CY2023Q1	us-gaap	Payments For Proceeds From Real Estate Partnership Investment Net PaymentsForProceedsFromRealEstatePartnershipInvestmentNet	0
CY2022Q1	us-gaap	Payments For Proceeds From Real Estate Partnership Investment Net PaymentsForProceedsFromRealEstatePartnershipInvestmentNet	247000
CY2023Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	596072000
CY2022Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1261114000
CY2023Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	98364000
CY2022Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	406499000
CY2023Q1	cbu	Net Increase Decrease In Overnight Federal Reserve Bank Borrowings NetIncreaseDecreaseInOvernightFederalReserveBankBorrowings	-710000000
CY2022Q1	cbu	Net Increase Decrease In Overnight Federal Reserve Bank Borrowings NetIncreaseDecreaseInOvernightFederalReserveBankBorrowings	0
CY2023Q1	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-42045000
CY2022Q1	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-24189000
CY2023Q1	us-gaap	Increase Decrease In Loans From Other Federal Home Loan Banks IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks	-2215000
CY2022Q1	us-gaap	Increase Decrease In Loans From Other Federal Home Loan Banks IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks	-24000
CY2023Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	10966000
CY2022Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3592000
CY2023Q1	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	60000
CY2022Q1	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	63000
CY2023Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	23708000
CY2022Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	23235000
CY2023Q1	cbu	Withholding Taxes Paid On Share Based Compensation WithholdingTaxesPaidOnShareBasedCompensation	1047000
CY2022Q1	cbu	Withholding Taxes Paid On Share Based Compensation WithholdingTaxesPaidOnShareBasedCompensation	969000
CY2023Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-694044000
CY2022Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	355038000
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-20598000
CY2022Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-854138000
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
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	189298000
CY2022Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1020926000
CY2023Q1	us-gaap	Interest Paid Net InterestPaidNet	14815000
CY2022Q1	us-gaap	Interest Paid Net InterestPaidNet	2839000
CY2023Q1	us-gaap	Income Taxes Paid IncomeTaxesPaid	1065000
CY2022Q1	us-gaap	Income Taxes Paid IncomeTaxesPaid	3344000
CY2023Q1	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	23778000
CY2022Q1	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	23234000
CY2023Q1	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	18000
CY2022Q1	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	203000
CY2023Q1	cbu	Transfer Of Property Plant And Equipment To Other Assets TransferOfPropertyPlantAndEquipmentToOtherAssets	1443000
CY2022Q1	cbu	Transfer Of Property Plant And Equipment To Other Assets TransferOfPropertyPlantAndEquipmentToOtherAssets	0
CY2023Q1	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	32000
CY2022Q1	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	0
CY2023Q1	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	9000
CY2022Q1	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	0
CY2021Q1	cbu	Number Of Insurance Agencies Asset Acquired NumberOfInsuranceAgenciesAssetAcquired	3
CY2023Q1	cbu	Business Combination Cash Consideration BusinessCombinationCashConsideration	2061000
CY2022	cbu	Business Combination Cash Consideration BusinessCombinationCashConsideration	85656000
CY2023Q1	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
CY2023Q1	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
CY2023Q1	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	436954000
CY2023Q1	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment	30000
CY2022Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment	11317000
CY2023Q1	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
CY2023Q1	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
CY2023Q1	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
CY2023Q1	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	3575000
CY2023Q1	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
CY2023Q1	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	672000
CY2022Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	43281000
CY2023Q1	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	100000
CY2022Q1	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	300000
CY2023Q1	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	31700000
CY2023Q1	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	9200000
CY2023Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1800000
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
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
CY2023Q1	cbu	Other Investments And Equity Securities At Cost OtherInvestmentsAndEquitySecuritiesAtCost	53595000
CY2023Q1	cbu	Other Investments And Equity Securities Accumulated Gross Unrealized Gain Before Tax OtherInvestmentsAndEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax	918000
CY2023Q1	cbu	Other Investments And Equity Securities Accumulated Gross Unrealized Loss Before Tax OtherInvestmentsAndEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0
CY2023Q1	cbu	Other Investment And Equity Securities Fair Value OtherInvestmentAndEquitySecuritiesFairValue	54513000
CY2022Q4	cbu	Other Investments And Equity Securities At Cost OtherInvestmentsAndEquitySecuritiesAtCost	82424000
CY2023Q1	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin: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;"><span style="visibility:hidden;"></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>
CY2023Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss	3871881000
CY2023Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1852000
CY2023Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	387740000
CY2023Q1	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	3485993000
CY2022Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss	4675474000
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	565000
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	524188000
CY2022Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	4151851000
CY2023Q1	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	1090235000
CY2023Q1	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	93000
CY2023Q1	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	6998000
CY2023Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1083330000
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
CY2023Q1	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	251000
CY2023Q1	cbu	Equity Securities Fv Ni Accumulated Gross Unrealized Gain Before Tax EquitySecuritiesFvNiAccumulatedGrossUnrealizedGainBeforeTax	168000
CY2023Q1	cbu	Equity Securities Fv Ni Accumulated Gross Unrealized Loss Before Tax EquitySecuritiesFvNiAccumulatedGrossUnrealizedLossBeforeTax	0
CY2023Q1	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	419000
CY2022Q4	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	251000
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
CY2023Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	436
CY2023Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	594111000
CY2023Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	5438000
CY2023Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	978
CY2023Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2712954000
CY2023Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	382302000
CY2023Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	1414
CY2023Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	3307065000
CY2023Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	387740000
CY2023Q1	cbu	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than12 Months HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThan12Months	22
CY2023Q1	cbu	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Less Than12 Months Fair Value DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsLessThan12MonthsFairValue	1044632000
CY2023Q1	cbu	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Less Than12 Months Accumulated Loss DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss	6998000
CY2023Q1	cbu	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions12 Months Or Longer HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions12MonthsOrLonger	0
CY2023Q1	cbu	Debt Securities Held To Maturity Continuous Unrealized Loss Positions12 Months Or Longer Fair Value DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositions12MonthsOrLongerFairValue	0
CY2023Q1	cbu	Debt Securities Held To Maturity Continuous Unrealized Loss Positions12 Months Or Longer Accumulated Loss DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositions12MonthsOrLongerAccumulatedLoss	0
CY2023Q1	cbu	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Position HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPosition	22
CY2023Q1	cbu	Debt Securities Held To Maturity Unrealized Loss Positions Fair Value DebtSecuritiesHeldToMaturityUnrealizedLossPositionsFairValue	1044632000
CY2023Q1	cbu	Debt Securities Held To Maturity Unrealized Loss Positions Accumulated Loss DebtSecuritiesHeldToMaturityUnrealizedLossPositionsAccumulatedLoss	6998000
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
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2023Q1	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	12300000
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2023Q1	us-gaap	Heldtomaturity Securities Debt Maturities Next Rolling Twelve Months Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost	0
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Fair Value HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	0
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	522140000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	519910000
CY2023Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Two Through Five Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCost	0
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Two Through Five Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	0
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	942103000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	862807000
CY2023Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCost	543031000
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Six Through Ten Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	541541000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	1251796000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	1127354000
CY2023Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling After Ten Years Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingAfterTenYearsAmortizedCost	543905000
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Rolling After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue	538490000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	709844000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	583979000
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	1086936000
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	1080031000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	3425883000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	3094050000
CY2023Q1	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	1090235000
CY2023Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1083330000
CY2023Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss	3871881000
CY2023Q1	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	3485993000
CY2023Q1	us-gaap	Debt Securities DebtSecurities	3750000000
CY2022Q4	us-gaap	Debt Securities DebtSecurities	2180000000
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	8982335000
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	8809394000
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	63170000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	61059000
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	8919165000
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	8748335000
CY2023Q1	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0
CY2022	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0
CY2022Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1617000
CY2022Q1	cbu	Provision For Loan Lease And Other Losses Excluding Acquisition Related Provision For Credit Losses ProvisionForLoanLeaseAndOtherLossesExcludingAcquisitionRelatedProvisionForCreditLosses	906000
CY2022Q1	cbu	Financing Receivable Allowance For Credit Loss Net FinancingReceivableAllowanceForCreditLossNet	51039000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	61100000
CY2023Q1	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	23800000
CY2023Q1	cbu	Impaired Financing Receivable With Related Allowance ImpairedFinancingReceivableWithRelatedAllowance	0
CY2022Q4	cbu	Impaired Financing Receivable With Related Allowance ImpairedFinancingReceivableWithRelatedAllowance	0
CY2023Q1	cbu	Impaired Financing Receivable Unpaid Principal Balance With No Related Allowance ImpairedFinancingReceivableUnpaidPrincipalBalanceWithNoRelatedAllowance	3093000
CY2022Q4	cbu	Impaired Financing Receivable Unpaid Principal Balance With No Related Allowance ImpairedFinancingReceivableUnpaidPrincipalBalanceWithNoRelatedAllowance	3163000
CY2023Q1	cbu	Impaired Financing Receivable Allowance ImpairedFinancingReceivableAllowance	3093000
CY2022Q4	cbu	Impaired Financing Receivable Allowance ImpairedFinancingReceivableAllowance	3163000
CY2023Q1	cbu	Impaired Financing Receivable Contractual Balance ImpairedFinancingReceivableContractualBalance	4201000
CY2022Q4	cbu	Impaired Financing Receivable Contractual Balance ImpairedFinancingReceivableContractualBalance	4201000
CY2023Q1	cbu	Impaired Financing Receivable Specifically Allocated Allowance ImpairedFinancingReceivableSpecificallyAllocatedAllowance	0
CY2022Q4	cbu	Impaired Financing Receivable Specifically Allocated Allowance ImpairedFinancingReceivableSpecificallyAllocatedAllowance	0
CY2023Q1	cbu	Impaired Financing Receivable Average Balances ImpairedFinancingReceivableAverageBalances	3100000
CY2022	cbu	Impaired Financing Receivable Average Balances ImpairedFinancingReceivableAverageBalances	12300000
CY2023Q1	cbu	Impaired Financing Receivable Interest Income ImpairedFinancingReceivableInterestIncome	0
CY2022	cbu	Impaired Financing Receivable Interest Income ImpairedFinancingReceivableInterestIncome	0
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	61059000
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	3230000
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	1719000
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	3622000
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	63170000
CY2022Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	1123000
CY2023Q1	cbu	Off Balance Sheet Credit Loss Liability Charge Offs OffBalanceSheetCreditLossLiabilityChargeOffs	0
CY2023Q1	cbu	Off Balance Sheet Credit Loss Liability Recovery OffBalanceSheetCreditLossLiabilityRecovery	0
CY2023Q1	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-122000
CY2023Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	1001000
CY2022Q4	cbu	Financing Receivable Allowance For Credit Loss Net FinancingReceivableAllowanceForCreditLossNet	62182000
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3230000
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1719000
CY2023Q1	cbu	Provision For Loan Lease And Other Losses Excluding Acquisition Related Provision For Credit Losses ProvisionForLoanLeaseAndOtherLossesExcludingAcquisitionRelatedProvisionForCreditLosses	3500000
CY2023Q1	cbu	Financing Receivable Allowance For Credit Loss Net FinancingReceivableAllowanceForCreditLossNet	64171000
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	49869000
CY2022Q1	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	2156000
CY2022Q1	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	1617000
CY2022Q1	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	817000
CY2022Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	50147000
CY2021Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	803000
CY2022Q1	cbu	Off Balance Sheet Credit Loss Liability Charge Offs OffBalanceSheetCreditLossLiabilityChargeOffs	0
CY2022Q1	cbu	Off Balance Sheet Credit Loss Liability Recovery OffBalanceSheetCreditLossLiabilityRecovery	0
CY2022Q1	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	89000
CY2022Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	892000
CY2021Q4	cbu	Financing Receivable Allowance For Credit Loss Net FinancingReceivableAllowanceForCreditLossNet	50672000
CY2022Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2156000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	197835000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	139857000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	57978000
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
CY2023Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	10153000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	11730000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	9994000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	8838000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	3408000
CY2023Q1	cbu	Finite Lived Intangible Asset Expected Amortization After Year Four FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour	13855000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	57978000
CY2022Q4	us-gaap	Goodwill Goodwill	841841000
CY2023Q1	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	1095000
CY2023Q1	us-gaap	Goodwill Goodwill	842936000
CY2022Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	200000
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	5798000
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	47055000
CY2022Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	46936000
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53843000
CY2022Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53993000
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.11
CY2022Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.87
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	5798000
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	47055000
CY2023Q1	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	-17000
CY2022Q1	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	-119000
CY2023Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5781000
CY2022Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	46936000
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53843000
CY2022Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53993000
CY2023Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	207000
CY2022Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	386000
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54050000
CY2022Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54379000
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.11
CY2022Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.86
CY2022Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	2697000
CY2023Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	200000000
CY2021Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	2697000
CY2022	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	250000000
CY2022Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	50000000
CY2023Q1	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	1516489000
CY2022Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	1544138000
CY2023Q1	cbu	Fair Value Liabilities Levels1 To Level2 Transfers Amount FairValueLiabilitiesLevels1ToLevel2TransfersAmount	0
CY2023Q1	cbu	Mortgages Held For Sale Unpaid Principal Value MortgagesHeldForSaleUnpaidPrincipalValue	300000
CY2022Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	0
CY2023Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	111030000
CY2023Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3500000
CY2023Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-52329000
CY2023Q1	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	242000
CY2023Q1	cbu	Non Interest Income Expenses Other Revenues NonInterestIncomeExpensesOtherRevenues	65582000
CY2023Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3667000
CY2023Q1	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	57000
CY2023Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	110328000
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	6973000
CY2023Q1	us-gaap	Assets Assets	15255953000
CY2023Q1	us-gaap	Goodwill Goodwill	842936000
CY2023Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	57978000
CY2022Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	94872000
CY2022Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	906000
CY2022Q1	us-gaap	Noninterest Income NoninterestIncome	65673000
CY2022Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3732000
CY2022Q1	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	299000
CY2022Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	95776000
CY2022Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	59832000
CY2022Q1	us-gaap	Assets Assets	15625883000
CY2022Q1	us-gaap	Goodwill Goodwill	799080000
CY2022Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	63958000

Files In Submission

Name	View Source	Status
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0001410578-23-000973-index.html	Edgar Link	pending
0001410578-23-000973.txt	Edgar Link	pending
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cbu-20230331.xsd	Edgar Link	pending
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cbu-20230331xex32d2.htm	Edgar Link	pending
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$CBU
Community Financial System Inc Stock $cbu

2023 Q2 Form 10-Q Financial Statement

#000141057823000973 Filed on May 10, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBU Community Financial System Inc Stock $cbu

2023 Q2 Form 10-Q Financial Statement

#000141057823000973 Filed on May 10, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBU
Community Financial System Inc Stock $cbu