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Loans and Leases - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) banking_office	Dec. 31, 2019 USD ($) subsidiary_bank	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Initial rate below the fully indexed rate, percent (less than)		1.00%
Sale of residential mortgage loans	$ 16,900,000				$ 27,700,000	$ 4,600,000
Net gains on sale of residential mortgage loans	227,000				458,000	50,000
Mortgage servicing assets added during the period	127,000				207,000	38,000
Amortization of mortgage servicing assets	117,000				69,000	122,000
Residential mortgage loans serviced	120,300,000				120,900,000
Mortgage servicing rights, amortized cost	815,000	$ 815,000	$ 815,000	$ 815,000	805,000
Mortgage servicing rights (MSR) impairment	0				0
Loans held for sale	807,000	807,000	807,000	807,000	2,700,000
Residential mortgage loans used to secure advances from FHLB	415,000,000.0	415,000,000.0	$ 415,000,000.0	$ 415,000,000.0	425,000,000.0
Number of subsidiary banks (banking office)			4	4
Interest income on nonaccrual loans	1,200,000				$ 1,000,000	$ 1,000,000
Loans and leases receivable, impaired, commitments to lend to nonperforming loans	$ 0	$ 0	$ 0	$ 0
NEW YORK
Business Acquisition [Line Items]
Number of subsidiary banks (banking office) | subsidiary_bank				3
Tompkins, Cayuga, Cortland and Schuyler Counties, New York
Business Acquisition [Line Items]
Number of banking offices | banking_office			14
Wyoming, Livingston, Genessee, Orleans and Monroe, New York
Business Acquisition [Line Items]
Number of banking offices | banking_office			16
Putnam Country, Dutchess Country and Westchester, New York
Business Acquisition [Line Items]
Number of banking offices | banking_office			14
Berks, Montgomery, Philadelphia, Deleware and Schuylkill, Pennsylvania
Business Acquisition [Line Items]
Number of banking offices | banking_office			20
LTV 80 to 100 Percent
Business Acquisition [Line Items]
Loan to value - fixed rate loans	80.00%	80.00%	80.00%	80.00%
Loan to value - adjusted rate loans	85.00%	85.00%	85.00%	85.00%
Agriculture | Commercial real estate
Business Acquisition [Line Items]
Loan to value - debt service coverage ratio	75.00%	75.00%	75.00%	75.00%

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Loan-to-value (LTV) ratio for adjustable rate loans.

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Loan-to-value (LTV) ratio for fixed rate loans.

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Loans and Leases Receivable, Impaired, Commitments To Lend To Nonperforming Loans

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Maximum Loan To Value

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Mortgage Loans On Real Estate, Initial Rate Below The Fully Indexed Rate, Percent

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Nature Of Operations, Number of Banking Offices

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This is the average principal amount (during the year) of the securitized and unsecuritized financial assets.

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The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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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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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

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Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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