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Document and Entity Information
Oct. 28, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 28, 2021
Entity Registrant Name Hanover Bancorp, Inc. /NY
Entity Incorporation, State or Country Code NY
Entity File Number 333-252262
Entity Tax Identification Number 81-3324480
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
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Central Index Key 0001828588