2.4.0.8 Html 325 352 1 true 68 0 false 6 false false R1.htm 00090 - Document - Document And Entity Information Sheet http://www.fiiwarsaw.com/role/DocumentDocumentAndEntityInformation Document And Entity Information false false R2.htm 00100 - Statement - Consolidated Statements Of Financial Condition Sheet http://www.fiiwarsaw.com/role/StatementConsolidatedStatementsOfFinancialCondition Consolidated Statements Of Financial Condition false false R3.htm 00105 - Statement - Consolidated Statements Of Financial Condition (Parenthetical) Sheet http://www.fiiwarsaw.com/role/StatementConsolidatedStatementsOfFinancialConditionParenthetical Consolidated Statements Of Financial Condition (Parenthetical) false false R4.htm 00200 - Statement - Consolidated Statements Of Income Sheet http://www.fiiwarsaw.com/role/StatementConsolidatedStatementsOfIncome Consolidated Statements Of Income false false R5.htm 00300 - Statement - Consolidated Statements Of Comprehensive Income (Loss) Sheet http://www.fiiwarsaw.com/role/StatementConsolidatedStatementsOfComprehensiveIncomeLoss Consolidated Statements Of Comprehensive Income (Loss) false false R6.htm 00400 - Statement - Consolidated Statement Of Changes In Shareholders' Equity Sheet http://www.fiiwarsaw.com/role/StatementConsolidatedStatementOfChangesInShareholdersEquity Consolidated Statement Of Changes In Shareholders' Equity false false R7.htm 00405 - Statement - Consolidated Statement Of Changes In Shareholders' Equity (Parenthetical) Sheet http://www.fiiwarsaw.com/role/StatementConsolidatedStatementOfChangesInShareholdersEquityParenthetical Consolidated Statement Of Changes In Shareholders' Equity (Parenthetical) false false R8.htm 00500 - Statement - Consolidated Statements Of Cash Flows Sheet http://www.fiiwarsaw.com/role/StatementConsolidatedStatementsOfCashFlows Consolidated Statements Of Cash Flows false false R9.htm 10101 - Disclosure - Basis of Presentation And Summary Of Significant Accounting Policies Sheet http://www.fiiwarsaw.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPolicies Basis of Presentation And Summary Of Significant Accounting Policies false false R10.htm 10201 - Disclosure - Earnings Per Common Share ("EPS") Sheet http://www.fiiwarsaw.com/role/DisclosureEarningsPerCommonShareeps Earnings Per Common Share ("EPS") false false R11.htm 10301 - Disclosure - Investment Securities Sheet http://www.fiiwarsaw.com/role/DisclosureInvestmentSecurities Investment Securities false false R12.htm 10401 - Disclosure - Loans Sheet http://www.fiiwarsaw.com/role/DisclosureLoans Loans false false R13.htm 10501 - Disclosure - Goodwill And Other Intangible Assets Sheet http://www.fiiwarsaw.com/role/DisclosureGoodwillAndOtherIntangibleAssets Goodwill And Other Intangible Assets false false R14.htm 10601 - Disclosure - Shareholders' Equity Sheet http://www.fiiwarsaw.com/role/DisclosureShareholdersEquity Shareholders' Equity false false R15.htm 10701 - Disclosure - Accumulated Other Comprehensive Income (Loss) Sheet http://www.fiiwarsaw.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLoss Accumulated Other Comprehensive Income (Loss) false false R16.htm 10801 - Disclosure - Share-Based Compensation Plans Sheet http://www.fiiwarsaw.com/role/DisclosureShareBasedCompensationPlans Share-Based Compensation Plans false false R17.htm 10901 - Disclosure - Employee Benefit Plans Sheet http://www.fiiwarsaw.com/role/DisclosureEmployeeBenefitPlans Employee Benefit Plans false false R18.htm 11001 - Disclosure - Commitments And Contingencies Sheet http://www.fiiwarsaw.com/role/DisclosureCommitmentsAndContingencies Commitments And Contingencies false false R19.htm 11101 - Disclosure - Fair Value Measurements Sheet http://www.fiiwarsaw.com/role/DisclosureFairValueMeasurements Fair Value Measurements false false R20.htm 20102 - Disclosure - Basis Of Presentation And Summary Of Significant Accounting Policies (Policy) Sheet http://www.fiiwarsaw.com/role/DisclosureBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicy Basis Of Presentation And Summary Of Significant Accounting Policies (Policy) false false R21.htm 30203 - Disclosure - Earnings Per Common Share ("EPS") (Tables) Sheet http://www.fiiwarsaw.com/role/DisclosureEarningsPerCommonShareepsTables Earnings Per Common Share ("EPS") (Tables) false false R22.htm 30303 - Disclosure - Investment Securities (Tables) Sheet http://www.fiiwarsaw.com/role/DisclosureInvestmentSecuritiesTables Investment Securities (Tables) false false R23.htm 30403 - Disclosure - Loans (Tables) Sheet http://www.fiiwarsaw.com/role/DisclosureLoansTables Loans (Tables) false false R24.htm 30503 - Disclosure - Goodwill And Other Intangible Assets (Tables) Sheet http://www.fiiwarsaw.com/role/DisclosureGoodwillAndOtherIntangibleAssetsTables Goodwill And Other Intangible Assets (Tables) false false R25.htm 30603 - Disclosure - Shareholders' Equity (Tables) Sheet http://www.fiiwarsaw.com/role/DisclosureShareholdersEquityTables Shareholders' Equity (Tables) false false R26.htm 30703 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables) Sheet http://www.fiiwarsaw.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossTables Accumulated Other Comprehensive Income (Loss) (Tables) false false R27.htm 30803 - Disclosure - Share-Based Compensation Plans (Tables) Sheet http://www.fiiwarsaw.com/role/DisclosureShareBasedCompensationPlansTables Share-Based Compensation Plans (Tables) false false R28.htm 30903 - Disclosure - Employee Benefit Plans (Tables) Sheet http://www.fiiwarsaw.com/role/DisclosureEmployeeBenefitPlansTables Employee Benefit Plans (Tables) false false R29.htm 31003 - Disclosure - Commitments And Contingencies (Tables) Sheet http://www.fiiwarsaw.com/role/DisclosureCommitmentsAndContingenciesTables Commitments And Contingencies (Tables) false false R30.htm 31103 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.fiiwarsaw.com/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) false false R31.htm 40201 - Disclosure - Earnings Per Common Share ("EPS") (Reconciliation Of Earnings And Shares Used In Calculating Basic And Diluted EPS) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureEarningsPerCommonShareepsReconciliationOfEarningsAndSharesUsedInCalculatingBasicAndDilutedEpsDetails Earnings Per Common Share ("EPS") (Reconciliation Of Earnings And Shares Used In Calculating Basic And Diluted EPS) (Details) false false R32.htm 40202 - Disclosure - Earnings Per Common Share ("EPS") (Shares Excluded from Computation of Diluted EPS) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureEarningsPerCommonShareepsSharesExcludedFromComputationOfDilutedEpsDetails Earnings Per Common Share ("EPS") (Shares Excluded from Computation of Diluted EPS) (Details) false false R33.htm 40301 - Disclosure - Investment Securities (Narrative) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureInvestmentSecuritiesNarrativeDetails Investment Securities (Narrative) (Details) false false R34.htm 40302 - Disclosure - Investment Securities (Summary Of Amortized Cost And Fair Value Of Investment Securities) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureInvestmentSecuritiesSummaryOfAmortizedCostAndFairValueOfInvestmentSecuritiesDetails Investment Securities (Summary Of Amortized Cost And Fair Value Of Investment Securities) (Details) false false R35.htm 40303 - Disclosure - Investment Securities (Scheduled Maturities Of Securities Available For Sale And Securities Held To Maturity) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureInvestmentSecuritiesScheduledMaturitiesOfSecuritiesAvailableForSaleAndSecuritiesHeldToMaturityDetails Investment Securities (Scheduled Maturities Of Securities Available For Sale And Securities Held To Maturity) (Details) false false R36.htm 40304 - Disclosure - Investment Securities (Sales And Calls Of Securities Available For Sale) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureInvestmentSecuritiesSalesAndCallsOfSecuritiesAvailableForSaleDetails Investment Securities (Sales And Calls Of Securities Available For Sale) (Details) false false R37.htm 40305 - Disclosure - Investment Securities (Investments' Gross Unrealized Losses And Fair Value) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureInvestmentSecuritiesInvestmentsGrossUnrealizedLossesAndFairValueDetails Investment Securities (Investments' Gross Unrealized Losses And Fair Value) (Details) false false R38.htm 40401 - Disclosure - Loans (Narrative) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureLoansNarrativeDetails Loans (Narrative) (Details) false false R39.htm 40402 - Disclosure - Loans (Loan Portfolio) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureLoansLoanPortfolioDetails Loans (Loan Portfolio) (Details) false false R40.htm 40403 - Disclosure - Loans (Recorded Investment By Loan Class In Current And Nonaccrual Loans) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureLoansRecordedInvestmentByLoanClassInCurrentAndNonaccrualLoansDetails Loans (Recorded Investment By Loan Class In Current And Nonaccrual Loans) (Details) false false R41.htm 40404 - Disclosure - Loans (Information Related To Loans Modified In A TDR) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureLoansInformationRelatedToLoansModifiedInTdrDetails Loans (Information Related To Loans Modified In A TDR) (Details) false false R42.htm 40405 - Disclosure - Loans (Summary Of Impaired Loans) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureLoansSummaryOfImpairedLoansDetails Loans (Summary Of Impaired Loans) (Details) false false R43.htm 40406 - Disclosure - Loans (Commercial Loan Portfolio Categorized By Internally Assigned Asset Classification) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureLoansCommercialLoanPortfolioCategorizedByInternallyAssignedAssetClassificationDetails Loans (Commercial Loan Portfolio Categorized By Internally Assigned Asset Classification) (Details) false false R44.htm 40407 - Disclosure - Loans (Retail Loan Portfolio Categorized By Payment Status) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureLoansRetailLoanPortfolioCategorizedByPaymentStatusDetails Loans (Retail Loan Portfolio Categorized By Payment Status) (Details) false false R45.htm 40408 - Disclosure - Loans (Changes In The Allowance For Loan Losses) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureLoansChangesInAllowanceForLoanLossesDetails Loans (Changes In The Allowance For Loan Losses) (Details) false false R46.htm 40501 - Disclosure - Goodwill And Other Intangible Assets (Narrative) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureGoodwillAndOtherIntangibleAssetsNarrativeDetails Goodwill And Other Intangible Assets (Narrative) (Details) false false R47.htm 40502 - Disclosure - Goodwill And Other Intangible Assets (Other Intangible Assets) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureGoodwillAndOtherIntangibleAssetsOtherIntangibleAssetsDetails Goodwill And Other Intangible Assets (Other Intangible Assets) (Details) false false R48.htm 40503 - Disclosure - Goodwill And Other Intangible Assets (Estimated Core Deposit Intangible Amortization Expense) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedCoreDepositIntangibleAmortizationExpenseDetails Goodwill And Other Intangible Assets (Estimated Core Deposit Intangible Amortization Expense) (Details) false false R49.htm 40601 - Disclosure - Shareholders' Equity (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureShareholdersEquityDetails Shareholders' Equity (Details) false false R50.htm 40701 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossComponentsOfOtherComprehensiveIncomeLossDetails Accumulated Other Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) false false R51.htm 40702 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) false false R52.htm 40703 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified Out Of Each Component Of Accumulated Other Comprehensive Income (Loss)) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAmountsReclassifiedOutOfEachComponentOfAccumulatedOtherComprehensiveIncomeLossDetails Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified Out Of Each Component Of Accumulated Other Comprehensive Income (Loss)) (Details) false false R53.htm 40801 - Disclosure - Share-Based Compensation Plans (Narrative) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureShareBasedCompensationPlansNarrativeDetails Share-Based Compensation Plans (Narrative) (Details) false false R54.htm 40802 - Disclosure - Share-Based Compensation Plans (Summary Of Restricted Stock Award Activity) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureShareBasedCompensationPlansSummaryOfRestrictedStockAwardActivityDetails Share-Based Compensation Plans (Summary Of Restricted Stock Award Activity) (Details) false false R55.htm 40803 - Disclosure - Share-Based Compensation Plans (Summary Of Stock Option Activity) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureShareBasedCompensationPlansSummaryOfStockOptionActivityDetails Share-Based Compensation Plans (Summary Of Stock Option Activity) (Details) false false R56.htm 40804 - Disclosure - Share-Based Compensation Plans (Share-Based Compensation Expense Included In Consolidated Statements Of Income) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureShareBasedCompensationPlansShareBasedCompensationExpenseIncludedInConsolidatedStatementsOfIncomeDetails Share-Based Compensation Plans (Share-Based Compensation Expense Included In Consolidated Statements Of Income) (Details) false false R57.htm 40901 - Disclosure - Employee Benefit Plans (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureEmployeeBenefitPlansDetails Employee Benefit Plans (Details) false false R58.htm 41001 - Disclosure - Commitments And Contingencies (Narrative) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureCommitmentsAndContingenciesNarrativeDetails Commitments And Contingencies (Narrative) (Details) true false R59.htm 41002 - Disclosure - Commitments And Contingencies (Off-Balance Sheet Commitments) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureCommitmentsAndContingenciesOffBalanceSheetCommitmentsDetails Commitments And Contingencies (Off-Balance Sheet Commitments) (Details) false false R60.htm 41101 - Disclosure - Fair Value Measurements (Narrative) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureFairValueMeasurementsNarrativeDetails Fair Value Measurements (Narrative) (Details) false false R61.htm 41102 - Disclosure - Fair Value Measurements (Assets Measured At Fair Value On A Recurring And Non-Recurring Basis) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureFairValueMeasurementsAssetsMeasuredAtFairValueOnRecurringAndNonRecurringBasisDetails Fair Value Measurements (Assets Measured At Fair Value On A Recurring And Non-Recurring Basis) (Details) false false R62.htm 41103 - Disclosure - Fair Value Measurements (Additional Quantitative Information About Assets Measured At Fair Value On A Recurring And Non-Recurring Basis) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureFairValueMeasurementsAdditionalQuantitativeInformationAboutAssetsMeasuredAtFairValueOnRecurringAndNonRecurringBasisDetails Fair Value Measurements (Additional Quantitative Information About Assets Measured At Fair Value On A Recurring And Non-Recurring Basis) (Details) false false R63.htm 41104 - Disclosure - Fair Value Measurements (Carrying Amount, Estimated Fair Value, And Placement In Fair Value Hierarchy Of Financial Instruments) (Details) Sheet http://www.fiiwarsaw.com/role/DisclosureFairValueMeasurementsCarryingAmountEstimatedFairValueAndPlacementInFairValueHierarchyOfFinancialInstrumentsDetails Fair Value Measurements (Carrying Amount, Estimated Fair Value, And Placement In Fair Value Hierarchy Of Financial Instruments) (Details) false false All Reports Book All Reports Element us-gaap_PreferredStockDividendRatePercentage had a mix of decimals attribute values: 2 4. 'Monetary' elements on report '40301 - Disclosure - Investment Securities (Narrative) (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '40501 - Disclosure - Goodwill And Other Intangible Assets (Narrative) (Details)' had a mix of different decimal attribute values. Process Flow-Through: 00100 - Statement - Consolidated Statements Of Financial Condition Process Flow-Through: Removing column 'Jun. 30, 2013' Process Flow-Through: Removing column 'Dec. 31, 2012' Process Flow-Through: 00105 - Statement - Consolidated Statements Of Financial Condition (Parenthetical) Process Flow-Through: 00200 - Statement - Consolidated Statements Of Income Process Flow-Through: 00300 - Statement - Consolidated Statements Of Comprehensive Income (Loss) Process Flow-Through: 00405 - Statement - Consolidated Statement Of Changes In Shareholders' Equity (Parenthetical) Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2014' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2013' Process Flow-Through: 00500 - Statement - Consolidated Statements Of Cash Flows fisi-20140630.xml fisi-20140630.xsd fisi-20140630_cal.xml fisi-20140630_def.xml fisi-20140630_lab.xml fisi-20140630_pre.xml true true