Loans and Leases - Narrative (Details)	12 Months Ended
Dec. 31, 2023 USD ($) banking_Office	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Sale of residential mortgage loans	$ 4,500,000	$ 8,900,000	$ 31,500,000
Net gains on sale of residential mortgage loans	96,000	155,000	943,000
Mortgage servicing assets added during the period	34,000	66,000	236,000
Amortization of mortgage servicing assets	81,000	128,000	182,000
Residential mortgage loans serviced	130,400,000	137,500,000
Mortgage servicing rights, amortized cost	927,000	1,000,000
Mortgage servicing rights (MSR) impairment	0	0
Loans held for sale	602,000	0
Residential mortgage loans used to secure advances from FHLB	125,000,000	50,000,000
Interest on nonaccrual loans	$ 2,200,000	$ 1,400,000	$ 1,500,000
Tompkins, Cayuga, Cortland and Schuyler Counties, New York
Business Acquisition [Line Items]
Number of banking offices \| banking_Office	12
Wyoming, Livingston, Genessee, Orleans and Monroe, New York
Business Acquisition [Line Items]
Number of banking offices \| banking_Office	15
Putnam Country, Dutchess Country and Westchester, New York
Business Acquisition [Line Items]
Number of banking offices \| banking_Office	13
Berks, Montgomery, Philadelphia, Deleware and Schuylkill, Pennsylvania
Business Acquisition [Line Items]
Number of banking offices \| banking_Office	16
LTV 80 to 100 Percent
Business Acquisition [Line Items]
Loan to value - fixed rate loans	80.00%
Loan to value - adjusted rate loans	80.00%

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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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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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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