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Loans and Leases - Narrative (Details) | 12 Months Ended
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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% |  |

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- Definition Loan-to-value (LTV) ratio for fixed rate loans. + References No definition available. + Details
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- Definition Maximum Loan To Value + References No definition available. + Details
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- Definition Mortgage Loans On Real Estate, Initial Rate Below The Fully Indexed Rate, Percent + References No definition available. + Details
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- Definition Nature Of Operations, Number of Banking Offices + References No definition available. + Details
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- Definition This is the average principal amount (during the year) of the securitized and unsecuritized financial assets. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746 + Details
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- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of interest income on financing receivable on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123605502&loc=d3e21310-158488 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123605502&loc=d3e21286-158488 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123605549&loc=d3e21493-158490 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124265262&loc=d3e48678-111004 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3461-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585 + Details
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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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