$FISI
FINANCIAL INSTITUTIONS INC Stock $fisi

$fisi Overview Financials Valuation SEC Filings Company Website

2022 Q3 Form 10-Q Financial Statement

#000095017022015551 Filed on August 08, 2022

Income Statement

Concept	2022 Q3	2022 Q2	2022 Q1
Revenue	$50.68M	$45.28M	$42.35M
YoY Change	22.92%	10.56%	2.61%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$1.820M	$2.300M	$1.918M
YoY Change	-14.95%	16.16%	-1.64%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$7.607M	$3.679M	$2.793M
YoY Change	157.52%	14.25%	-18.24%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$18.58M	$19.51M	$18.43M
YoY Change	-14.49%	-23.8%	-29.29%
Income Tax	$4.725M	$3.859M	$3.443M
% Of Pretax Income	25.43%	19.78%	18.69%
Net Earnings	$13.85M	$15.65M	$14.98M
YoY Change	-19.34%	-22.53%	-27.65%
Net Earnings / Revenue	27.34%	34.56%	35.38%
Basic Earnings Per Share	$0.88	$1.00	$0.94
Diluted Earnings Per Share	$900.0K	$0.99	$0.93
COMMON SHARES
Basic Shares Outstanding	15.33M	15.31M	15.58M
Diluted Shares Outstanding	15.39M	15.39M	15.70M

Balance Sheet

Concept	2022 Q3	2022 Q2	2022 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$118.6M	$109.7M	$170.4M
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	$40.91M	$40.46M	$40.12M
YoY Change	0.74%	-7.14%	-50.17%
Goodwill	$67.07M	$67.07M	$67.07M
YoY Change	0.0%	0.6%	0.6%
Intangibles
YoY Change
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	$5.624B	$5.568B	$5.630B
YoY Change	0.02%	5.16%	5.66%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$32.41M	$23.19M	$23.53M
YoY Change	33.9%	-6.48%	7.44%
Deferred Revenue
YoY Change
Short-Term Debt	$69.00M	$109.0M	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$32.41M	$23.19M	$23.53M
YoY Change	33.9%	-6.48%	7.44%
LONG-TERM LIABILITIES
Long-Term Debt	$74.14M	$74.07M	$73.99M
YoY Change	0.47%	0.36%	0.39%
Other Long-Term Liabilities	$182.1M	$115.6M	$83.20M
YoY Change	224.09%	130.32%	62.5%
Total Long-Term Liabilities	$256.3M	$189.7M	$157.2M
YoY Change	97.14%	52.97%	25.85%
TOTAL LIABILITIES
Total Short-Term Liabilities	$32.41M	$23.19M	$23.53M
Total Long-Term Liabilities	$256.3M	$189.7M	$157.2M
Total Liabilities	$5.230B	$5.142B	$5.184B
YoY Change	1.97%	6.96%	6.6%
SHAREHOLDERS EQUITY
Retained Earnings	$414.1M	$405.0M	$394.2M
YoY Change	12.21%	13.61%
Common Stock	$161.0K	$161.0K	$161.0K
YoY Change	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$22.51M	$22.51M	$23.58M
YoY Change	267.4%	267.22%
Treasury Stock Shares	$765.5K	$765.5K	$800.5K
Shareholders Equity	$394.0M	$425.8M	$446.8M
YoY Change
Total Liabilities & Shareholders Equity	$5.624B	$5.568B	$5.630B
YoY Change	0.02%	5.16%	5.66%

Cashflow Statement

Concept	2022 Q3	2022 Q2	2022 Q1
OPERATING ACTIVITIES
Net Income	$13.85M	$15.65M	$14.98M
YoY Change	-19.34%	-22.53%	-27.65%
Depreciation, Depletion And Amortization	$1.820M	$2.300M	$1.918M
YoY Change	-14.95%	16.16%	-1.64%
Cash From Operating Activities	$35.64M	$37.59M	$44.19M
YoY Change	318.36%	253.29%	117.65%
INVESTING ACTIVITIES
Capital Expenditures	-$1.642M	-$2.783M	$1.216M
YoY Change	-21.06%	-53.54%	319.31%
Acquisitions			$0.00
YoY Change			-100.0%
Other Investing Activities	-$64.95M	-$16.98M	-$77.88M
YoY Change	-72.42%	-79.19%	-59.22%
Cash From Investing Activities	-$66.60M	-$19.76M	-$79.09M
YoY Change	-71.97%	-77.43%	-58.64%
FINANCING ACTIVITIES
Cash Dividend Paid			$4.624M
YoY Change			1.96%
Common Stock Issuance & Retirement, Net			$15.03M
YoY Change			151.99%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	39.83M	-78.53M	126.2M
YoY Change	-87.2%	27.77%	-70.09%
NET CHANGE
Cash From Operating Activities	35.64M	37.59M	44.19M
Cash From Investing Activities	-66.60M	-19.76M	-79.09M
Cash From Financing Activities	39.83M	-78.53M	126.2M
Net Change In Cash	8.876M	-60.70M	91.29M
YoY Change	-89.18%	-56.14%	-63.62%
FREE CASH FLOW
Cash From Operating Activities	$35.64M	$37.59M	$44.19M
Capital Expenditures	-$1.642M	-$2.783M	$1.216M
Free Cash Flow	$37.29M	$40.37M	$42.98M
YoY Change	251.75%	142.77%	114.73%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2021Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilities
CY2022Q2	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilities
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Amendment Flag AmendmentFlag	false
	dei	Entity Central Index Key EntityCentralIndexKey	0000862831
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssets
CY2022Q2	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssets
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2022-06-30
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2022
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	000-26481
CY2022Q2	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	42452000
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	39676000
	dei	Entity Registrant Name EntityRegistrantName	Financial Institutions, Inc.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	NY
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	16-0816610
	dei	Entity Address Address Line1 EntityAddressAddressLine1	220 LIBERTY STREET
	dei	Entity Address City Or Town EntityAddressCityOrTown	WARSAW
	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	14569
	dei	City Area Code CityAreaCode	585
	dei	Local Phone Number LocalPhoneNumber	786-1100
	dei	Security12b Title Security12bTitle	Common stock, par value $0.01 per share
	dei	Trading Symbol TradingSymbol	FISI
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2022Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	15334091
CY2022Q2	us-gaap	Cash And Due From Banks CashAndDueFromBanks	109705000
CY2021Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	79112000
CY2022Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1057018000
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1178515000
CY2022Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	5000
CY2021Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	5000
CY2022Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	195451000
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	209820000
CY2022Q2	fisi	Held To Maturity Securities Net HeldToMaturitySecuritiesNet	204933000
CY2021Q4	fisi	Held To Maturity Securities Net HeldToMaturitySecuritiesNet	205581000
CY2022Q2	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	4265000
CY2021Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	6202000
CY2022Q2	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3721566000
CY2021Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3639760000
CY2022Q2	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	135611000
CY2021Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	123898000
CY2022Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	40461000
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	40111000
CY2022Q2	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	73897000
CY2021Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	74400000
CY2022Q2	us-gaap	Other Assets OtherAssets	220742000
CY2021Q4	us-gaap	Other Assets OtherAssets	173200000
CY2022Q2	us-gaap	Assets Assets	5568198000
CY2021Q4	us-gaap	Assets Assets	5520779000
CY2022Q2	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1114460000
CY2021Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1107561000
CY2022Q2	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	877661000
CY2022Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-99725000
CY2021Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	864528000
CY2022Q2	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1845186000
CY2021Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1933047000
CY2022Q2	us-gaap	Time Deposits TimeDeposits	983209000
CY2021Q4	us-gaap	Time Deposits TimeDeposits	921954000
CY2022Q2	us-gaap	Deposits Deposits	4820516000
CY2021Q4	us-gaap	Deposits Deposits	4827090000
CY2022Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	109000000
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	30000000
CY2022Q2	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	933000
CY2021Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	1089000
CY2022Q2	us-gaap	Long Term Debt LongTermDebt	74067000
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	73911000
CY2022Q2	us-gaap	Other Liabilities OtherLiabilities	138814000
CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	84636000
CY2022Q2	us-gaap	Liabilities Liabilities	5142397000
CY2021Q4	us-gaap	Liabilities Liabilities	5015637000
CY2022Q2	us-gaap	Preferred Stock Value PreferredStockValue	17292000
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	17292000
CY2022Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000
CY2022Q2	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	16099556
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	16099556
CY2022Q2	us-gaap	Common Stock Value CommonStockValue	161000
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	161000
CY2022Q2	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	125568000
CY2021Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	126105000
CY2022Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	405019000
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	384007000
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-13207000
CY2022Q2	us-gaap	Treasury Stock Shares TreasuryStockShares	765465
CY2021Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	354103
CY2022Q2	us-gaap	Treasury Stock Value TreasuryStockValue	22514000
CY2021Q4	us-gaap	Treasury Stock Value TreasuryStockValue	9216000
CY2022Q2	us-gaap	Stockholders Equity StockholdersEquity	425801000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	505142000
CY2022Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5568198000
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5520779000
CY2022Q2	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	38872000
CY2021Q2	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	36393000
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	75170000
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	73452000
CY2022Q2	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	6294000
CY2021Q2	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	4498000
	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	12330000
	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	8685000
CY2022Q2	us-gaap	Interest And Other Income InterestAndOtherIncome	110000
CY2021Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	42354000
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	78273000
	fisi	Provision Benefit For Credit Losses ProvisionBenefitForCreditLosses	-6603000
CY2022Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	41034000
CY2021Q2	us-gaap	Interest And Other Income InterestAndOtherIncome	61000
	us-gaap	Interest And Other Income InterestAndOtherIncome	127000
	us-gaap	Interest And Other Income InterestAndOtherIncome	88000
CY2022Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	45276000
CY2021Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	40952000
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	87627000
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	82225000
CY2022Q2	us-gaap	Interest Expense Deposits InterestExpenseDeposits	2366000
CY2021Q2	us-gaap	Interest Expense Deposits InterestExpenseDeposits	2165000
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	4071000
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	4400000
CY2022Q2	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	252000
CY2021Q2	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	0
	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	280000
	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	119000
CY2022Q2	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	1061000
CY2021Q2	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	1055000
	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	2121000
	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	2117000
CY2022Q2	us-gaap	Interest Expense InterestExpense	3679000
CY2021Q2	us-gaap	Interest Expense InterestExpense	3220000
	us-gaap	Interest Expense InterestExpense	6472000
	us-gaap	Interest Expense InterestExpense	6636000
CY2022Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	41597000
CY2021Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	37732000
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	81155000
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	75589000
CY2022Q2	fisi	Provision Benefit For Credit Losses ProvisionBenefitForCreditLosses	563000
CY2021Q2	fisi	Provision Benefit For Credit Losses ProvisionBenefitForCreditLosses	-4622000
	fisi	Provision Benefit For Credit Losses ProvisionBenefitForCreditLosses	2882000
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	82192000
CY2022Q2	fisi	Noninterest Income Service Charges On Deposits NoninterestIncomeServiceChargesOnDeposits	1437000
CY2021Q2	fisi	Noninterest Income Service Charges On Deposits NoninterestIncomeServiceChargesOnDeposits	1287000
	fisi	Noninterest Income Service Charges On Deposits NoninterestIncomeServiceChargesOnDeposits	2806000
	fisi	Noninterest Income Service Charges On Deposits NoninterestIncomeServiceChargesOnDeposits	2579000
CY2022Q2	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	1234000
CY2021Q2	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	1147000
	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	3331000
	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	2543000
CY2022Q2	fisi	Card Interchange Income CardInterchangeIncome	2103000
CY2021Q2	fisi	Card Interchange Income CardInterchangeIncome	2194000
	fisi	Card Interchange Income CardInterchangeIncome	4055000
	fisi	Card Interchange Income CardInterchangeIncome	4152000
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	5947000
CY2022Q2	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	2906000
CY2021Q2	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	2886000
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	5658000
CY2022Q2	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	869000
CY2021Q2	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	693000
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1702000
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1350000
CY2022Q2	fisi	Noninterest Income Investments In Limited Partnerships NoninterestIncomeInvestmentsInLimitedPartnerships	242000
CY2021Q2	fisi	Noninterest Income Investments In Limited Partnerships NoninterestIncomeInvestmentsInLimitedPartnerships	238000
	fisi	Noninterest Income Investments In Limited Partnerships NoninterestIncomeInvestmentsInLimitedPartnerships	1037000
	fisi	Noninterest Income Investments In Limited Partnerships NoninterestIncomeInvestmentsInLimitedPartnerships	1093000
CY2022Q2	fisi	Noninterest Income Loan Servicing NoninterestIncomeLoanServicing	135000
CY2021Q2	fisi	Noninterest Income Loan Servicing NoninterestIncomeLoanServicing	91000
	fisi	Noninterest Income Loan Servicing NoninterestIncomeLoanServicing	244000
	fisi	Noninterest Income Loan Servicing NoninterestIncomeLoanServicing	188000
CY2022Q2	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	645000
CY2021Q2	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-592000
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	1164000
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	1283000
CY2022Q2	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	828000
CY2021Q2	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	790000
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	737000
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1868000
CY2022Q2	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-15000
CY2021Q2	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-3000
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-15000
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	71000
CY2022Q2	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	7000
CY2021Q2	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	153000
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	7000
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	148000
CY2022Q2	fisi	Gain Loss On Tax Credit Investments GainLossOnTaxCreditInvestments	-92000
CY2021Q2	fisi	Gain Loss On Tax Credit Investments GainLossOnTaxCreditInvestments	276000
	fisi	Gain Loss On Tax Credit Investments GainLossOnTaxCreditInvestments	-319000
	fisi	Gain Loss On Tax Credit Investments GainLossOnTaxCreditInvestments	191000
CY2022Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1061000
CY2021Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1030000
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1986000
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2025000
CY2022Q2	us-gaap	Noninterest Income NoninterestIncome	11360000
CY2021Q2	us-gaap	Noninterest Income NoninterestIncome	10190000
	us-gaap	Noninterest Income NoninterestIncome	22682000
	us-gaap	Noninterest Income NoninterestIncome	23149000
CY2022Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	16966000
CY2021Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	14519000
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	33582000
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	28984000
CY2022Q2	us-gaap	Occupancy Net OccupancyNet	4015000
CY2021Q2	us-gaap	Occupancy Net OccupancyNet	3286000
	us-gaap	Occupancy Net OccupancyNet	7771000
CY2021Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	2464000
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	5490000
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	4497000
CY2022Q2	us-gaap	Noninterest Expense NoninterestExpense	32887000
CY2021Q2	us-gaap	Noninterest Expense NoninterestExpense	26944000
	us-gaap	Occupancy Net OccupancyNet	6668000
CY2022Q2	us-gaap	Professional Fees ProfessionalFees	1269000
CY2021Q2	us-gaap	Professional Fees ProfessionalFees	1603000
	us-gaap	Professional Fees ProfessionalFees	2925000
	us-gaap	Professional Fees ProfessionalFees	3498000
CY2022Q2	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	4573000
CY2021Q2	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3460000
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	8552000
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	6581000
CY2022Q2	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	469000
CY2021Q2	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	430000
	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	1010000
	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	914000
CY2022Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	621000
CY2021Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	480000
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1134000
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1245000
CY2022Q2	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	406000
CY2021Q2	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	436000
	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	786000
	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	760000
CY2022Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	249000
CY2021Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	266000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	503000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	537000
CY2022Q2	us-gaap	Restructuring Charges RestructuringCharges	1269000
CY2021Q2	us-gaap	Restructuring Charges RestructuringCharges	0
	us-gaap	Restructuring Charges RestructuringCharges	1269000
	us-gaap	Restructuring Charges RestructuringCharges	0
CY2022Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3050000
	us-gaap	Noninterest Expense NoninterestExpense	63022000
	us-gaap	Noninterest Expense NoninterestExpense	53684000
CY2022Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	19507000
CY2021Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	25600000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	37933000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	51657000
CY2022Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3859000
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5400000
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7302000
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10747000
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	15648000
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	20200000
	us-gaap	Net Income Loss NetIncomeLoss	30631000
	us-gaap	Net Income Loss NetIncomeLoss	40910000
CY2022Q2	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	365000
CY2021Q2	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	366000
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	729000
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	731000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-47000
CY2021Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-137000
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-95000
CY2022Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	15283000
CY2021Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	19834000
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	29902000
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	40179000
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.00
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.25
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.94
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.53
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.99
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.25
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.93
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.52
CY2022Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.29
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.27
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.58
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.54
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	15648000
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	20200000
	us-gaap	Net Income Loss NetIncomeLoss	30631000
	us-gaap	Net Income Loss NetIncomeLoss	40910000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-33415000
CY2021Q2	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	5002000
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-89188000
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-9400000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	737000
CY2021Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-501000
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	2575000
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	1063000
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-275000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-32631000
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	4638000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-86518000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-8062000
CY2022Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-16983000
CY2021Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	24838000
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-55887000
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	32848000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	505142000
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	14983000
CY2022Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-53887000
CY2022Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	15026000
CY2022Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	443000
CY2022Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.29
CY2022Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4444000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-32631000
CY2022Q1	us-gaap	Stockholders Equity StockholdersEquity	446846000
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	15648000
CY2022Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	301000
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-2736000
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-2452000
	fisi	Provision For Credit Losses ProvisionForCreditLosses	2882000
CY2022Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	947000
CY2022Q2	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	102000
CY2022Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.29
CY2022Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4446000
CY2022Q2	us-gaap	Stockholders Equity StockholdersEquity	425801000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	468363000
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	20710000
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-12700000
CY2021Q1	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	301000
CY2021Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	5963000
CY2021Q1	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	6000
CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	216000
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.27
CY2021Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4272000
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	466284000
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	20200000
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	4638000
CY2021Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1000
CY2021Q2	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	37000
CY2021Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	562000
CY2021Q2	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	118000
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.27
CY2021Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4272000
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	487126000
	us-gaap	Profit Loss ProfitLoss	30631000
	us-gaap	Profit Loss ProfitLoss	40910000
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4218000
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	3931000
	fisi	Provision For Credit Losses ProvisionForCreditLosses	-6603000
	us-gaap	Share Based Compensation ShareBasedCompensation	1390000
	us-gaap	Share Based Compensation ShareBasedCompensation	778000
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-646000
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2333000
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	18768000
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	42767000
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	16094000
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	40523000
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1702000
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1350000
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	737000
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1868000
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-15000
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	71000
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	7000
CY2021Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	206387000
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	148000
	fisi	Noncash Restructuring Charges Against Assets NoncashRestructuringChargesAgainstAssets	1269000
	fisi	Noncash Restructuring Charges Against Assets NoncashRestructuringChargesAgainstAssets	11000
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	14393000
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2950000
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	53454000
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-14620000
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	81784000
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	30949000
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	75269000
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	411641000
	fisi	Payments For Proceeds From Held To Maturity Securities PaymentsForProceedsFromHeldToMaturitySecurities	36035000
	fisi	Payments For Proceeds From Held To Maturity Securities PaymentsForProceedsFromHeldToMaturitySecurities	1830000
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	68269000
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	70596000
	fisi	Payments For Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities PaymentsForProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	-36265000
	fisi	Payments For Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities PaymentsForProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	-54288000
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	6252000
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	51891000
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	84329000
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	37523000
	us-gaap	Payments For Proceeds From Life Insurance Policies PaymentsForProceedsFromLifeInsurancePolicies	10011000
	us-gaap	Payments For Proceeds From Life Insurance Policies PaymentsForProceedsFromLifeInsurancePolicies	12000
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2459000
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3999000
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	6284000
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	759000
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-98857000
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-278815000
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-6574000
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	380854000
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	79000000
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-5300000
	us-gaap	Payments For Repurchase Of Preferred Stock And Preference Stock PaymentsForRepurchaseOfPreferredStockAndPreferenceStock	0
	us-gaap	Payments For Repurchase Of Preferred Stock And Preference Stock PaymentsForRepurchaseOfPreferredStockAndPreferenceStock	43000
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	15327000
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	5964000
	us-gaap	Payments Of Dividends PaymentsOfDividends	9433000
	us-gaap	Payments Of Dividends PaymentsOfDividends	9172000
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	47666000
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	360375000
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	30593000
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	112509000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	79112000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	93878000
CY2022Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	109705000
CY2022Q2	us-gaap	Weighted Average Number Of Shares Treasury Stock WeightedAverageNumberOfSharesTreasuryStock	789000
CY2021Q2	us-gaap	Weighted Average Number Of Shares Treasury Stock WeightedAverageNumberOfSharesTreasuryStock	269000
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="text-indent:0.0%;font-size:10.0pt;margin-top:8.0pt;line-height:1.15;font-family:Times New Roman;margin-bottom:0.0pt;text-align:justify;"><span style="background-color:rgba(0,0,0,0);color:rgba(0,0,0,1);white-space:pre-wrap;font-weight:bold;font-size:10.0pt;font-family:Times New Roman;min-width:fit-content;">Reclassifications</span></p><p style="text-indent:0.0%;font-size:10.0pt;margin-top:4.0pt;line-height:1.15;font-family:Times New Roman;margin-bottom:0.0pt;text-align:justify;"><span style="background-color:rgba(0,0,0,0);color:rgba(0,0,0,1);white-space:pre-wrap;font-weight:normal;font-size:10.0pt;font-family:Times New Roman;min-width:fit-content;">Certain reclassifications of previously reported amounts have been made to conform to the current year presentation. Such reclassifications did not impact net income or shareholders’ equity as previously reported.</span></p>
	us-gaap	Use Of Estimates UseOfEstimates	<p style="text-indent:0.0%;font-size:10.0pt;margin-top:12.0pt;line-height:1.15;font-family:Times New Roman;margin-bottom:0.0pt;text-align:justify;"><span style="background-color:rgba(0,0,0,0);color:rgba(0,0,0,1);white-space:pre-wrap;font-weight:bold;font-size:10.0pt;font-family:Times New Roman;min-width:fit-content;">Use of Estimates</span></p><p style="text-indent:0.0%;font-size:10.0pt;margin-top:4.0pt;line-height:1.15;font-family:Times New Roman;margin-bottom:0.0pt;text-align:justify;"><span style="background-color:rgba(0,0,0,0);color:rgba(0,0,0,1);white-space:pre-wrap;font-weight:normal;font-size:10.0pt;font-family:Times New Roman;min-width:fit-content;">The preparation of these financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Material estimates relate to the determination of the allowance for credit losses, the carrying value of goodwill and deferred tax assets, and assumptions used in the defined benefit pension plan accounting.</span></p>
	us-gaap	Interest Paid Net InterestPaidNet	6129000
	us-gaap	Interest Paid Net InterestPaidNet	8148000
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	871000
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	7100000
CY2022Q2	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	4810000
CY2021Q2	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	4638000
	us-gaap	Stock Issued1 StockIssued1	0
	us-gaap	Stock Issued1 StockIssued1	301000
	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	0
	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	449000
	us-gaap	Weighted Average Number Of Shares Treasury Stock WeightedAverageNumberOfSharesTreasuryStock	655000
CY2021Q2	us-gaap	Payments For Restructuring PaymentsForRestructuring	68000
	us-gaap	Payments For Restructuring PaymentsForRestructuring	37000
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	16100000
CY2022Q2	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	5000
	us-gaap	Payments For Restructuring PaymentsForRestructuring	146000
CY2022Q2	us-gaap	Restructuring Reserve Period Increase Decrease RestructuringReservePeriodIncreaseDecrease	1353000
CY2021Q2	us-gaap	Restructuring Reserve Period Increase Decrease RestructuringReservePeriodIncreaseDecrease	5000
CY2020Q3	fisi	Number Of Bank Branch Closure NumberOfBankBranchClosure	6
CY2020Q3	fisi	Percentage Of Branch Network PercentageOfBranchNetwork	0.10
CY2020Q3	fisi	Percentage Of Branch Network Impact PercentageOfBranchNetworkImpact	0.06
CY2020Q4	fisi	Number Of Additional Branches Planned To Close NumberOfAdditionalBranchesPlannedToClose	1
CY2020	fisi	Pre Tax Expense Related Branch Closures PreTaxExpenseRelatedBranchClosures	1700000
CY2022Q2	us-gaap	Restructuring Charges RestructuringCharges	1300000
	us-gaap	Restructuring Charges RestructuringCharges	1300000
CY2022Q1	us-gaap	Restructuring Reserve RestructuringReserve	445000
CY2021Q1	us-gaap	Restructuring Reserve RestructuringReserve	1161000
CY2021Q4	us-gaap	Restructuring Reserve RestructuringReserve	445000
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	1245000
CY2022Q2	us-gaap	Restructuring Costs RestructuringCosts	1269000
CY2021Q2	us-gaap	Restructuring Costs RestructuringCosts	0
	us-gaap	Restructuring Costs RestructuringCosts	1269000
	us-gaap	Restructuring Costs RestructuringCosts	0
CY2022Q2	us-gaap	Payments For Restructuring PaymentsForRestructuring	37000
	us-gaap	Restructuring Reserve Period Increase Decrease RestructuringReservePeriodIncreaseDecrease	1353000
	us-gaap	Restructuring Reserve Period Increase Decrease RestructuringReservePeriodIncreaseDecrease	11000
CY2022Q2	us-gaap	Restructuring Reserve RestructuringReserve	324000
CY2021Q2	us-gaap	Restructuring Reserve RestructuringReserve	1088000
CY2022Q2	us-gaap	Restructuring Reserve RestructuringReserve	324000
CY2021Q2	us-gaap	Restructuring Reserve RestructuringReserve	1088000
	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	1800000
CY2021	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	2600
CY2022Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	15283000
CY2021Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	19834000
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	29902000
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	40179000
CY2022Q2	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	16100000
CY2021Q2	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	16100000
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	16100000
CY2021Q2	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	6000
	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	5000
	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	6000
	us-gaap	Weighted Average Number Of Shares Treasury Stock WeightedAverageNumberOfSharesTreasuryStock	237000
CY2022Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15306000
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15825000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15440000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15857000
CY2022Q2	fisi	Incremental Common Shares Attributable To Vesting Of Restricted Stock Awards IncrementalCommonSharesAttributableToVestingOfRestrictedStockAwards	79000
CY2021Q2	fisi	Incremental Common Shares Attributable To Vesting Of Restricted Stock Awards IncrementalCommonSharesAttributableToVestingOfRestrictedStockAwards	88000
	fisi	Incremental Common Shares Attributable To Vesting Of Restricted Stock Awards IncrementalCommonSharesAttributableToVestingOfRestrictedStockAwards	92000
	fisi	Incremental Common Shares Attributable To Vesting Of Restricted Stock Awards IncrementalCommonSharesAttributableToVestingOfRestrictedStockAwards	86000
CY2022Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15385000
CY2021Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15913000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15532000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15943000
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.00
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.25
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.94
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.53
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.99
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.25
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.93
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.52
CY2022Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	21000
CY2021Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1000
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	15000
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	6000
CY2022Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1183305000
CY2022Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	370000
CY2022Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	126657000
CY2022Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1057018000
CY2022Q2	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	204938000
CY2022Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	111000
CY2022Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	9598000
CY2022Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	195451000
CY2022Q2	fisi	Allowance For Credit Losses Amortized Cost AllowanceForCreditLossesAmortizedCost	5000
CY2022Q2	fisi	Held To Maturity Securities Net HeldToMaturitySecuritiesNet	204933000
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1184835000
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	8446000
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	180000
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	14766000
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1178515000
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	5550000
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	750814000
CY2022Q2	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	6252000
CY2021Q2	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	25216000
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	77422000
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	6252000
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	305309000
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	51891000
CY2022Q2	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	38008000
CY2021Q2	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	162000
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	251000
CY2022Q2	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	15000
CY2021Q2	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	165000
CY2021Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	205586000
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	4683000
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	449000
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	209820000
CY2021Q4	fisi	Allowance For Credit Losses Amortized Cost AllowanceForCreditLossesAmortizedCost	5000
CY2021Q4	fisi	Held To Maturity Securities Net HeldToMaturitySecuritiesNet	205581000
CY2022Q2	fisi	Debt Securities Available For Sale And Held To Maturity Restricted DebtSecuritiesAvailableForSaleAndHeldToMaturityRestricted	815800000
CY2021Q4	fisi	Debt Securities Available For Sale And Held To Maturity Restricted DebtSecuritiesAvailableForSaleAndHeldToMaturityRestricted	637600000
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	15000
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	5535000
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	86194000
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	83372000
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	152838000
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	141476000
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	938723000
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	826635000
CY2022Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1183305000
CY2022Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1057018000
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	35543000
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	35602000
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	45992000
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	45676000
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	39273000
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	84130000
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	76165000
CY2022Q2	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	204938000
CY2022Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	195451000
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	49235000
CY2022Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1056123000
CY2022Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	126657000
CY2022Q2	fisi	Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value InvestmentSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	750814000
CY2022Q2	fisi	Investment Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss InvestmentSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	77422000
CY2022Q2	fisi	Investment Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value InvestmentSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	305309000
CY2022Q2	fisi	Investment Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss InvestmentSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	49235000
CY2022Q2	fisi	Investment Securities Continuous Unrealized Loss Position Fair Value InvestmentSecuritiesContinuousUnrealizedLossPositionFairValue	1056123000
CY2022Q2	fisi	Investment Securities Accumulated Unrecognized Holding Loss InvestmentSecuritiesAccumulatedUnrecognizedHoldingLoss	126657000
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	773484000
CY2022Q2	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	42452000
CY2022Q2	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3721566000
CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2022Q2	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	3710490000
CY2022Q2	fisi	Loans And Leases Receivable Deferred Loan Fees Costs LoansAndLeasesReceivableDeferredLoanFeesCosts	-53528000
CY2022Q2	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	3764018000
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	10039000
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	172180000
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	4727000
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	945664000
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	14766000
CY2021Q4	fisi	Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value InvestmentSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	773484000
CY2021Q4	fisi	Investment Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss InvestmentSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	10039000
CY2021Q4	fisi	Investment Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value InvestmentSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	172180000
CY2021Q4	fisi	Investment Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss InvestmentSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	4727000
CY2021Q4	fisi	Investment Securities Continuous Unrealized Loss Position Fair Value InvestmentSecuritiesContinuousUnrealizedLossPositionFairValue	945664000
CY2021Q4	fisi	Investment Securities Accumulated Unrecognized Holding Loss InvestmentSecuritiesAccumulatedUnrecognizedHoldingLoss	14766000
CY2022Q2	fisi	Investment Securities In Unrealized Loss Position Number Of Positions InvestmentSecuritiesInUnrealizedLossPositionNumberOfPositions	207
CY2021Q4	fisi	Investment Securities In Unrealized Loss Position Number Of Positions InvestmentSecuritiesInUnrealizedLossPositionNumberOfPositions	116
CY2022Q2	fisi	Investment Securities In Unrealized Loss Positions Twelve Months Or Longer Qualitative Disclosure Number Of Positions InvestmentSecuritiesInUnrealizedLossPositionsTwelveMonthsOrLongerQualitativeDisclosureNumberOfPositions	55
CY2022Q2	fisi	Investment Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value InvestmentSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	305300000
CY2022Q2	fisi	Investment Securities In Unrealized Loss Positions Less Than Twelve Months Qualitative Disclosure Number Of Positions InvestmentSecuritiesInUnrealizedLossPositionsLessThanTwelveMonthsQualitativeDisclosureNumberOfPositions	152
CY2022Q2	fisi	Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value InvestmentSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	750800000
CY2022Q2	fisi	Investment Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss InvestmentSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	77400000
CY2021Q4	fisi	Investment Securities In Unrealized Loss Positions Twelve Months Or Longer Qualitative Disclosure Number Of Positions InvestmentSecuritiesInUnrealizedLossPositionsTwelveMonthsOrLongerQualitativeDisclosureNumberOfPositions	28
CY2021Q4	fisi	Investment Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value InvestmentSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	172200000
CY2021Q4	fisi	Investment Securities In Unrealized Loss Positions Less Than Twelve Months Qualitative Disclosure Number Of Positions InvestmentSecuritiesInUnrealizedLossPositionsLessThanTwelveMonthsQualitativeDisclosureNumberOfPositions	88
CY2021Q4	fisi	Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value InvestmentSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	773500000
CY2021Q4	fisi	Investment Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss InvestmentSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	10000000.0
CY2022Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2021Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	3631355000
CY2021Q4	fisi	Loans And Leases Receivable Deferred Loan Fees Costs LoansAndLeasesReceivableDeferredLoanFeesCosts	-48081000
CY2021Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	3679436000
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	39676000
CY2021Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	3639760000
CY2022Q2	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	6548000
CY2022Q2	us-gaap	Notes Receivable Gross NotesReceivableGross	3710490000
CY2022Q2	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	6465000
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	11369000
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	3631355000
CY2021Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	5611000
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	42452000
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	39676000
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	6141000
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	6394000
	us-gaap	Interest Income Operating InterestIncomeOperating	288000
	us-gaap	Interest Income Operating InterestIncomeOperating	461000
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	0
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	0
	fisi	Financing Receivable Allowance For Loan Losses Provision Credit FinancingReceivableAllowanceForLoanLossesProvisionCredit	2523000
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	42452000
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	49828000
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	1729000
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2123000
CY2021Q2	fisi	Financing Receivable Allowance For Loan Losses Provision Credit FinancingReceivableAllowanceForLoanLossesProvisionCredit	-3857000
CY2022Q2	fisi	Financing Receivable Allowance For Loan Losses Provision Credit FinancingReceivableAllowanceForLoanLossesProvisionCredit	446000
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0
	fisi	Days Past Due When Loans Are Generally Placed On Nonaccrual Status In Days DaysPastDueWhenLoansAreGenerallyPlacedOnNonaccrualStatusInDays	P90D
	fisi	Days Past Due When Loans Are Generally Placed On Nonaccrual Status In Days DaysPastDueWhenLoansAreGenerallyPlacedOnNonaccrualStatusInDays	P90D
CY2022Q2	fisi	Collateral Dependent Loans On Business Assets CollateralDependentLoansOnBusinessAssets	205000
CY2022Q2	fisi	Collateral Dependent Loans On Real Property CollateralDependentLoansOnRealProperty	23738000
CY2022Q2	fisi	Collateral Dependent Loans CollateralDependentLoans	23943000
CY2022Q2	fisi	Collateral Dependent Loan With Specific Reserve CollateralDependentLoanWithSpecificReserve	2935000
CY2021Q4	fisi	Collateral Dependent Loans On Business Assets CollateralDependentLoansOnBusinessAssets	326000
CY2021Q4	fisi	Collateral Dependent Loans On Real Property CollateralDependentLoansOnRealProperty	38929000
CY2021Q4	fisi	Collateral Dependent Loans CollateralDependentLoans	39255000
CY2021Q4	fisi	Collateral Dependent Loan With Specific Reserve CollateralDependentLoanWithSpecificReserve	5771000
CY2022Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	40966000
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3228000
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4268000
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	46365000
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	52420000
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	4593000
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4100000
	fisi	Financing Receivable Allowance For Loan Losses Provision Credit FinancingReceivableAllowanceForLoanLossesProvisionCredit	-5562000
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	46365000
	us-gaap	Lessee Operating Lease Description LesseeOperatingLeaseDescription	The Company is obligated under a number of non-cancellable operating lease agreements for land, buildings and equipment with terms, including renewal options reasonably certain to be exercised, extending through 2061
	us-gaap	Lessee Operating Sublease Option To Extend LesseeOperatingSubleaseOptionToExtend	One building lease was subleased with terms that extended through December 31, 2022.
	fisi	Number Of Buildings Subleased NumberOfBuildingsSubleased	1
CY2022Q2	fisi	Operating Lease Right Of Use Asset Gross OperatingLeaseRightOfUseAssetGross	27239000
CY2021Q4	fisi	Operating Lease Right Of Use Asset Gross OperatingLeaseRightOfUseAssetGross	27063000
CY2022Q2	fisi	Operating Lease Right Of Use Asset Accumulated Amortization OperatingLeaseRightOfUseAssetAccumulatedAmortization	5989000
CY2021Q4	fisi	Operating Lease Right Of Use Asset Accumulated Amortization OperatingLeaseRightOfUseAssetAccumulatedAmortization	4993000
CY2022Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	21250000
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	36570000
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	22070000
CY2022Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	23193000
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	23867000
CY2022Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P24Y
CY2022Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0372
CY2022Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	664000
CY2021Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	795000
	us-gaap	Operating Lease Cost OperatingLeaseCost	1332000
	us-gaap	Operating Lease Cost OperatingLeaseCost	1475000
CY2022Q2	us-gaap	Variable Lease Cost VariableLeaseCost	132000
CY2021Q2	us-gaap	Variable Lease Cost VariableLeaseCost	90000
	us-gaap	Variable Lease Cost VariableLeaseCost	245000
	us-gaap	Variable Lease Cost VariableLeaseCost	188000
CY2022Q2	us-gaap	Sublease Income SubleaseIncome	11000
CY2021Q2	us-gaap	Sublease Income SubleaseIncome	12000
	us-gaap	Sublease Income SubleaseIncome	23000
	us-gaap	Sublease Income SubleaseIncome	23000
CY2022Q2	us-gaap	Lease Cost LeaseCost	785000
CY2021Q2	us-gaap	Lease Cost LeaseCost	873000
	us-gaap	Lease Cost LeaseCost	1554000
	us-gaap	Lease Cost LeaseCost	1640000
CY2022Q2	us-gaap	Operating Lease Payments OperatingLeasePayments	714000
CY2021Q2	us-gaap	Operating Lease Payments OperatingLeasePayments	688000
	us-gaap	Operating Lease Payments OperatingLeasePayments	1357000
	us-gaap	Operating Lease Payments OperatingLeasePayments	1349000
CY2022Q2	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	100000
CY2021Q2	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	3314000
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	190000
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4178000
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	1091000
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	1769000
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	1456000
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	1382000
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	1299000
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	29573000
CY2022Q2	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	13377000
CY2022Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	23193000
CY2022Q2	fisi	Lessee Operating Lease Lease Not Yet Commenced LesseeOperatingLeaseLeaseNotYetCommenced	14500000
CY2022Q2	us-gaap	Goodwill Goodwill	67100000
CY2021Q4	us-gaap	Goodwill Goodwill	67100000
CY2021Q4	us-gaap	Goodwill Goodwill	67071000
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0
CY2022Q2	us-gaap	Goodwill Goodwill	67071000
CY2022Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	249000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	503000
CY2021Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	266000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	537000
CY2022Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	482000
CY2022Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	910000
CY2022Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	838000
CY2022Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	766000
CY2022Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	694000
CY2022Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	623000
CY2021Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	72976000
CY2022Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	21250000
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	22070000
CY2022Q2	fisi	Tax Credit Investments TaxCreditInvestments	56970000
CY2021Q4	fisi	Tax Credit Investments TaxCreditInvestments	57010000
CY2022Q2	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	38198000
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	16504000
CY2022Q2	fisi	Collateral On Derivative Instruments CollateralOnDerivativeInstruments	0
CY2021Q4	fisi	Collateral On Derivative Instruments CollateralOnDerivativeInstruments	4640000
CY2022Q2	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	104324000
CY2022Q2	us-gaap	Other Assets OtherAssets	220742000
CY2021Q4	us-gaap	Other Assets OtherAssets	173200000
CY2022Q2	us-gaap	Derivative Fixed Interest Rate DerivativeFixedInterestRate	0.00787
	fisi	Derivative Maturity Date DerivativeMaturityDate	2027-04
CY2022Q2	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	1200000
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	16099556
CY2022Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	16099556
CY2022Q2	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	16099556
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	16099556
CY2021Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	16099556
CY2021Q2	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	16099556
CY2022Q2	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	766447
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	766447
CY2020Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	801879
CY2022Q1	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	461191
CY2022Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	31.99
CY2021	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	340688
CY2022Q2	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-43870000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-11239000
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-32631000
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-116321000
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-29803000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-86518000
CY2021Q2	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	6236000
CY2021Q2	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	1598000
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	4638000
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-10839000
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-2777000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-8062000
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-1000
CY2022Q2	us-gaap	Share Based Compensation ShareBasedCompensation	947000
CY2021Q2	us-gaap	Share Based Compensation ShareBasedCompensation	562000
	us-gaap	Share Based Compensation ShareBasedCompensation	1390000
	us-gaap	Share Based Compensation ShareBasedCompensation	778000
CY2022Q2	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	871000
CY2021Q2	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	1049000
	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	1742000
	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	2098000
CY2022Q2	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	647000
CY2021Q2	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	551000
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1294000
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1102000
CY2022Q2	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1141000
CY2021Q2	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1307000
	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	2282000
	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	2613000
CY2022Q2	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	0
CY2021Q2	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-1000
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	0
CY2022Q2	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-64000
CY2021Q2	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-186000
	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-128000
	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-371000
CY2022Q2	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	441000
CY2021Q2	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	478000
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	882000
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	957000
CY2022Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	6826000
CY2022Q2	us-gaap	Assets Assets	5568198000
CY2021Q4	us-gaap	Goodwill Goodwill	67071000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	7329000
CY2022Q2	fisi	Fair Value Assets Level1 To Level2 Transfer Amount FairValueAssetsLevel1ToLevel2TransferAmount	0
CY2022Q2	fisi	Fair Value Assets Level2 To Level1 Transfer Amount FairValueAssetsLevel2ToLevel1TransferAmount	0
CY2022Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	0
CY2021Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	0
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1
CY2022Q2	us-gaap	Goodwill Goodwill	67071000
CY2021Q4	us-gaap	Assets Assets	5520779000
CY2022Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	41597000
CY2022Q2	fisi	Provision Benefit For Credit Losses ProvisionBenefitForCreditLosses	563000
CY2022Q2	us-gaap	Noninterest Income NoninterestIncome	11360000
CY2022Q2	us-gaap	Noninterest Expense NoninterestExpense	32887000
CY2022Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	19507000
CY2022Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3859000
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	15648000
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	81155000
	fisi	Provision Benefit For Credit Losses ProvisionBenefitForCreditLosses	2882000
	us-gaap	Noninterest Income NoninterestIncome	22682000
	us-gaap	Noninterest Expense NoninterestExpense	63022000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	37933000
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7302000
	us-gaap	Net Income Loss NetIncomeLoss	30631000
CY2021Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	37732000
CY2021Q2	fisi	Provision Benefit For Credit Losses ProvisionBenefitForCreditLosses	-4622000
CY2021Q2	us-gaap	Noninterest Income NoninterestIncome	10190000
CY2021Q2	us-gaap	Noninterest Expense NoninterestExpense	26944000
CY2021Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	25600000
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5400000
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	20200000
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	75589000
	fisi	Provision Benefit For Credit Losses ProvisionBenefitForCreditLosses	-6603000
	us-gaap	Noninterest Income NoninterestIncome	23149000
	us-gaap	Noninterest Expense NoninterestExpense	53684000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	51657000
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10747000
	us-gaap	Net Income Loss NetIncomeLoss	40910000

Files In Submission

Name	View Source	Status
0000950170-22-015551-index-headers.html	Edgar Link	pending
0000950170-22-015551-index.html	Edgar Link	pending
0000950170-22-015551.txt	Edgar Link	pending
0000950170-22-015551-xbrl.zip	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
fisi-20220630.htm	Edgar Link	pending
fisi-20220630.xsd	Edgar Link	pending
fisi-ex31_1.htm	Edgar Link	pending
fisi-ex31_2.htm	Edgar Link	pending
fisi-ex32.htm	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
fisi-20220630_cal.xml	Edgar Link	unprocessable
fisi-20220630_def.xml	Edgar Link	unprocessable
fisi-20220630_lab.xml	Edgar Link	unprocessable
fisi-20220630_pre.xml	Edgar Link	unprocessable
fisi-20220630_htm.xml	Edgar Link	completed
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$FISI
FINANCIAL INSTITUTIONS INC Stock $fisi

2022 Q3 Form 10-Q Financial Statement

#000095017022015551 Filed on August 08, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FISI FINANCIAL INSTITUTIONS INC Stock $fisi

2022 Q3 Form 10-Q Financial Statement

#000095017022015551 Filed on August 08, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FISI
FINANCIAL INSTITUTIONS INC Stock $fisi