Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2022	May 05, 2022
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2022
Entity File Number	001-39883
Entity Registrant Name	Generations Bancorp NY, Inc.
Entity Address, State or Province	MD
Entity Tax Identificatoin Number	85-3659943
Entity Address, Address Line One	20 East Bayard Street
Entity Address, City or Town	Seneca Falls
Entity Incorporation, State or Country Code	NY
Entity Address, Postal Zip Code	13148
City Area Code	315
Local Phone Number	568-5855
Title of 12(b) Security	Common Stock
Trading Symbol	GBNY
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		2,458,261
Entity Central Index Key	0001823365
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Amendment Flag	false