Summary of Significant Accounting Policies - Loan Modifications Under the CARES Act (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Loan Modifications Under the CARES Act [Abstract]
Total loan modifications under CARES Act	$ 220,400
Remaining loan modifications under the CARES Act	$ 283	$ 19,500

The outstanding balance of loans receivable modified under the CARES Act.

No definition available.

Name:	hnvr_LoanModificationsUnderCARESActAmountOutstanding
Namespace Prefix:	hnvr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant