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REAL ESTATE OWNED (Detail Textuals) - USD ($) | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Real Estate Owned, Disclosure of Detailed Components [Abstract] |  |  |
Operating expenses | $ 12,000 | $ 24,000 | $ 198,000
Net gain (losses) on dispositions of REO | 81,000 | (5,000) | (187,000)
Write-downs on existing REO properties |  | $ 30,000 | $ 369,000
Carrying amount of foreclosed residential real estate properties | 298,000 |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 51,000 |  |

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- Definition Represents the net gain (losses) on dispositions of Real Estate Owned (REO) during the indicated period. + References No definition available. + Details
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- Definition Represents the writedown expenses related to Real Estate Owned (REO) during the indicated time period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Represents the operating expenses related to Real Estate Owned (REO) during the indicated time period. + References No definition available. + Details
Name: | rvsb_RealEstateOwnedOperatingExpenses
Namespace Prefix: | rvsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4437-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL49126937-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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