Loans and Leases - Narrative (Details)	12 Months Ended
Dec. 31, 2021 USD ($) banking_Office subsidiary_Bank	Dec. 31, 2020 USD ($) banking_Office	Dec. 31, 2019 USD ($) banking_Office
Business Acquisition [Line Items]
Initial rate below the fully indexed rate, percent (less than)	1.00%
Sale of residential mortgage loans	$ 31,500,000	$ 51,700,000	$ 16,900,000
Net gains on sale of residential mortgage loans	943,000	2,100,000	227,000
Mortgage servicing assets added during the period	236,000	388,000	127,000
Amortization of mortgage servicing assets	182,000	221,000	$ 117,000
Residential mortgage loans serviced	147,100,000	140,900,000
Mortgage servicing rights, amortized cost	1,000,000	981,000
Mortgage servicing rights (MSR) impairment	0	0
Loans held for sale	205,000	4,400,000
Residential mortgage loans used to secure advances from FHLB	$ 110,000,000	$ 265,000,000
Number of subsidiary banks (banking office)	4	4	4
Interest on nonaccrual loans	$ 1,500,000	$ 1,700,000	$ 1,200,000
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	13
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
Commercial real estate \| Agriculture
Business Acquisition [Line Items]
Loan to value - debt service coverage ratio	80.00%
LTV 80 to 100 Percent
Business Acquisition [Line Items]
Loan to value - fixed rate loans	80.00%
Loan to value - adjusted rate loans	85.00%

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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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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Nature of Operations, Number of Subsidiary Banks

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

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No definition available.

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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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Amount of interest income on financing receivable on nonaccrual status.

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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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Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

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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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