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STOCK PLAN AND STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Sep. 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
Six Months Ended September 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
Granted |  | 46,256 | ​ |  | 5.15 |  | 100,217 | ​ |  | 5.15 |  | 146,473 | ​ |  | 5.15
Forfeited |  | — | ​ |  | — |  | (27,822) | ​ |  | 5.76 |  | (27,822) | ​ |  | 5.76
Vested |  | (12,630) | ​ |  | 5.70 |  | (23,470) | ​ |  | 5.58 |  | (36,100) | ​ |  | 5.62
Balance, end of period |  | 188,660 | ​ | $ | 5.60 |  | 174,094 | ​ | $ | 5.36 |  | 362,754 | ​ | $ | 5.49
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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
Six Months Ended September 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
Forfeited |  | — | ​ |  | — |  | (14,075) | ​ |  | 5.21 |  | (14,075) | ​ |  | 5.21
Vested |  | (6,289) | ​ |  | 5.84 |  | (13,417) | ​ |  | 6.54 |  | (19,706) | ​ |  | 6.32
Balance, end of period |  | 9,490 | ​ | $ | 5.64 |  | 35,905 | ​ | $ | 5.54 |  | 45,395 | ​ | $ | 5.57
​

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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