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v2.4.1.9

Segment Reporting (Business Segment Information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Net interest income | $ 23,147us-gaap_InterestIncomeExpenseNet | $ 23,275us-gaap_InterestIncomeExpenseNet
Provision for loan losses | (2,741)us-gaap_ProvisionForLoanAndLeaseLosses | (2,106)us-gaap_ProvisionForLoanAndLeaseLosses
Noninterest income | 8,297us-gaap_NoninterestIncome | 6,357us-gaap_NoninterestIncome
Noninterest expense | (19,011)us-gaap_NoninterestExpense | (17,213)us-gaap_NoninterestExpense
Income before income taxes | 9,692us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 10,313us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax (expense) benefit | (2,891)us-gaap_IncomeTaxExpenseBenefit | (3,094)us-gaap_IncomeTaxExpenseBenefit
Net income | 6,801us-gaap_ProfitLoss | 7,219us-gaap_ProfitLoss
Banking [Member] |  |
Segment Reporting Information [Line Items] |  |
Net interest income | 23,147us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember |
Provision for loan losses | (2,741)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember |
Noninterest income | 6,831us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember |
Noninterest expense | (17,279)us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember |
Income before income taxes | 9,958us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember |
Income tax (expense) benefit | (2,949)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember |
Net income | 7,009us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember |
Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Noninterest income | 1,593us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember |
Noninterest expense | (1,187)us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember |
Income before income taxes | 406us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember |
Income tax (expense) benefit | (159)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember |
Net income | 247us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember |
Holding Company and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Noninterest income | (127)us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = fisi_HoldingCompanyAndOtherSegmentMember |
Noninterest expense | (545)us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = fisi_HoldingCompanyAndOtherSegmentMember |
Income before income taxes | (672)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = fisi_HoldingCompanyAndOtherSegmentMember |
Income tax (expense) benefit | 217us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = fisi_HoldingCompanyAndOtherSegmentMember |
Net income | $ (455)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = fisi_HoldingCompanyAndOtherSegmentMember |

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Total aggregate amount of all noninterest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 14 -Article 9 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591551-111686 + Details
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