PREMISES AND EQUIPMENT - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
PREMISES AND EQUIPMENT
Depreciation and amortization expense	$ 2.0	$ 2.1	$ 2.0

Represents the depreciation expense for Premises and Equipment during the indicated period.

No definition available.

Name:	rvsb_PremisesAndEquipmentDepreciationExpense
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration