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Federal Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Federal Income Taxes [Abstract]                      
Tax provision at statutory rate                 $ 3,539us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 2,559us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 1,998us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Income on tax-exempt loans and securities                 (1,466)us-gaap_IncomeTaxReconciliationTaxExemptIncome (1,212)us-gaap_IncomeTaxReconciliationTaxExemptIncome (1,251)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Nondeductible interest expense relating to carrying tax-exempt obligations                 28us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 30us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 43us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Dividends received exclusion                 (7)us-gaap_IncomeTaxReconciliationDeductionsDividends (15)us-gaap_IncomeTaxReconciliationDeductionsDividends (17)us-gaap_IncomeTaxReconciliationDeductionsDividends
Income from bank owned life insurance                 (163)fraf_IncomeTaxReconciliationIncomeFromBankOwnedLifeInsurance (185)fraf_IncomeTaxReconciliationIncomeFromBankOwnedLifeInsurance (217)fraf_IncomeTaxReconciliationIncomeFromBankOwnedLifeInsurance
Life insurance proceeds                   111us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance  
Other, net                 75us-gaap_IncomeTaxReconciliationOtherAdjustments 7us-gaap_IncomeTaxReconciliationOtherAdjustments (44)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax provision $ 347us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 641us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 606us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 412us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 206us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 583us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 198us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 308us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 2,006us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 1,295us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 512us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Effective income tax rate                 19.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 17.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 8.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations