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Parent Company Financial Information (Condensed Statements Of Condition) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |
Other assets | $ 63,281 us-gaap_OtherAssets |  | $ 64,313 us-gaap_OtherAssets
Total assets | 3,089,521 us-gaap_Assets | [1] | 2,928,636 us-gaap_Assets
Other liabilities | 24,658 us-gaap_OtherLiabilities |  | 16,699 us-gaap_OtherLiabilities
Shareholders' equity | 279,532 us-gaap_StockholdersEquity |  | 254,839 us-gaap_StockholdersEquity
Total liabilities and shareholders' equity | 3,089,521 us-gaap_LiabilitiesAndStockholdersEquity |  | 2,928,636 us-gaap_LiabilitiesAndStockholdersEquity
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Cash and due from subsidiary | 9,559 fisi_CashAndDueFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 9,510 fisi_CashAndDueFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment in and receivables due from subsidiary | 273,237 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 245,071 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other assets | 3,433 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 3,463 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total assets | 286,229 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 258,044 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other liabilities | 6,697 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 3,205 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Shareholders' equity | 279,532 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 254,839 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities and shareholders' equity | $ 286,229 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | $ 258,044 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
[1] | Reflects activity from SDN since August 1, 2014, the date of acquisition.

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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