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Segment and Related Information (Details 1)	12 Months Ended
	Dec. 31, 2016 segment banking_office subsidiary_trust office
Segment Reporting Information [Line Items]
Number of unconsolidated subsidiary trusts | subsidiary_trust	4
Number of reportable business segments | segment	3
Ithaca, NY
Segment Reporting Information [Line Items]
Number of banking offices	13
Genesee Valley Region, New York State
Segment Reporting Information [Line Items]
Number of banking offices	17
Counties North of New York City
Segment Reporting Information [Line Items]
Number of banking offices	14
Southeastern Pennsylvania
Segment Reporting Information [Line Items]
Number of banking offices	21
Western New York
Segment Reporting Information [Line Items]
Nature of operations, number of offices | office	5
Tompkins County, New York
Segment Reporting Information [Line Items]
Nature of operations, number of offices | office	1
Montgomery County, Pennsylvania
Segment Reporting Information [Line Items]
Nature of operations, number of offices | office	1

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- Definition

Nature Of Operations, Number of Banking Offices

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- Definition

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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