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

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