Summary of Significant Accounting Policies - Additional Information (Details)				1 Months Ended	12 Months Ended
	May 08, 2019 USD ($) shares	Feb. 29, 2016 USD ($)	Oct. 16, 2014 USD ($) shares	Oct. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) Subsidiary Office Derivative	Apr. 01, 2021 USD ($)	Oct. 15, 2015 USD ($)
Nature of Operations [Abstract]
Net proceeds from private placement	$ 19,600,000
Number of wholly-owned subsidiaries | Subsidiary					2
Consolidation of membership interest in Fitzgibbons					100.00%
Number of offices located In Oswego County | Office					7
Number of offices located in Onondaga County | Office					3
Number of loan production office located in Oneida County | Office					1
Significant Group Concentrations of Credit Risk [Abstract]
Minimum commercial real estate loans amount required for additional review					$ 400,000
Advertising Expense [Abstract]
Advertising contracts maturity description					Expenditures for new marketing and advertising material designs and/or media content, related to specifically-identifiable marketing campaigns are capitalized and expensed over the estimated life of the campaign. Such periods of time are generally 12-24 months in duration and do not exceed 36 months.
Cash and Cash Equivalents [Abstract]
Maturity period for classification as cash and cash equivalents, maximum					3 months
Allowance for Loan Losses [Abstract]
Maximum percentage for estimating specific and general losses					10.00%
Minimum amount, of residential mortgage loans threshold for evaluations of impairment					$ 300,000
Income Recognition on Impaired and Non-accrual Loans [Abstract]
Number of consecutive months of current payments before non-accrual troubled debt restructured loans are restored to accrual status					6 months
Goodwill and Intangible Assets [Abstract]
Estimated useful life					15 years
Interest Rate Derivatives [Member]
Goodwill and Intangible Assets [Abstract]
Number of interest rate derivatives | Derivative					2
Maximum [Member] | Premises [Member]
Premises and Equipment [Abstract]
Useful life					40 years
Maximum [Member] | Equipment [Member]
Premises and Equipment [Abstract]
Useful life					10 years
SBLF Preferred stock [Member]
Nature of Operations [Abstract]
Retirement of preferred stock		$ 13,000,000.0
Common Stock [Member] | Private Placement [Member]
Nature of Operations [Abstract]
Sale of stock | shares	37,700
Preferred Stock [Member] | Private Placement [Member]
Nature of Operations [Abstract]
Sale of stock | shares	1,155,283
Subordinated Debt [Member]
Nature of Operations [Abstract]
Subordinated loan face value						$ 10,000,000.0	$ 10,000,000.0
non-amortizing Subordinated Loan				$ 25,000,000.0
Pathfinder Bank [Member]
Nature of Operations [Abstract]
Amount received of net proceeds			$ 24,900,000
Number of shares of common stock sold (in shares) | shares			2,636,053
FitzGibbons Agency LLC [Member] | Pathfinder Risk Management Company Inc [Member]
Nature of Operations [Abstract]
Membership interest own in Fitzgibbons through subsidiary					51.00%
Noncontrolling interest by subsidiary					49.00%