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EMPLOYEE BENEFIT PLANS - Employee stock ownership plan (Details) | 12 Months Ended
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Mar. 31, 2023 USD ($) item shares | Mar. 31, 2022 USD ($) item shares | Mar. 31, 2021 USD ($) item shares
Employee stock ownership plan [Abstract] |  |  |
Number of hours of service | item | 1,000 | 1,000 | 1,000
Bank purchased common stock on open market and contributed such shares to ESOP | 25,000 | 25,000 | 5,354
Expense related to ESOP | $ | $ 187,000 | $ 192,000 | $ 96,000
Shares released and allocated to participants | 368,194 | 387,588 |

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- References No definition available. + Details
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Namespace Prefix: | rvsb_
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Balance Type: | na
Period Type: | duration

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- Definition Represents number hours of services. + References No definition available. + Details
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Namespace Prefix: | rvsb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents number of share related to esop. + References No definition available. + Details
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Namespace Prefix: | rvsb_
Data Type: | xbrli:sharesItemType
Balance Type: | na
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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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