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Cover
Oct. 17, 2022
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 17, 2022
Entity File Number 001-41384
Entity Registrant Name Hanover Bancorp, Inc. /NY
Entity Central Index Key 0001828588
Entity Tax Identification Number 81-3324480
Entity Incorporation, State or Country Code NY
Entity Address, Address Line One 80 East Jericho Turnpike
Entity Address, City or Town Mineola
Entity Address, State or Province NY
Entity Address, Postal Zip Code 11501
City Area Code 516
Local Phone Number 548-8500
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock
Trading Symbol HNVR
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false