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STOCK PLAN AND STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Jun. 30, 2025
STOCK PLAN AND STOCK-BASED COMPENSATION |
Schedule of unvested restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Time Based |  | Performance Based |  | Total
​ | ​ | Number | ​ | Weighted | ​ | Number | ​ | Weighted | ​ | Number | ​ | Weighted
​ | ​ | of | ​ | Average | ​ | of | ​ | Average | ​ | of | ​ | Average
​ | ​ | Unvested | ​ | Grant Date | ​ | Unvested | ​ | Grant Date | ​ | Unvested | ​ | Grant Date
Three Months Ended June 30, 2025 |  | Shares |  | Fair Value |  | Shares |  | Fair Value |  | Shares |  | Fair Value
Balance, beginning of period |  | 155,034 | ​ | $ | 5.74 |  | 125,169 | ​ | $ | 5.66 |  | 280,203 | ​ | $ | 5.71
Balance, end of period |  | 155,034 | ​ | $ | 5.74 |  | 125,169 | ​ | $ | 5.66 |  | 280,203 | ​ | $ | 5.71
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Time Based |  | Performance Based |  | Total
​ | ​ | Number | ​ | Weighted | ​ | Number | ​ | Weighted | ​ | Number | ​ | Weighted
​ | ​ | of | ​ | Average | ​ | of | ​ | Average | ​ | of | ​ | Average
​ | ​ | Unvested | ​ | Grant Date | ​ | Unvested | ​ | Grant Date | ​ | Unvested | ​ | Grant Date
Three Months Ended June 30, 2024 |  | Shares |  | Fair Value |  | Shares |  | Fair Value |  | Shares |  | Fair Value
Balance, beginning of period |  | 15,779 | ​ | $ | 5.72 |  | 63,397 | ​ | $ | 5.68 |  | 79,176 | ​ | $ | 5.69
Balance, end of period |  | 15,779 | ​ | $ | 5.72 |  | 63,397 | ​ | $ | 5.68 |  | 79,176 | ​ | $ | 5.69
​

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- Definition Tabular disclosure of the change in unvested restricted stock. + References No definition available. + Details
Name: | rvsb_ScheduleOfUnvestedRestrictedStockActivityTableTextBlock
Namespace Prefix: | rvsb_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration