Name:	rvsb_InvestmentSecuritiesAvailableForSalePledgedAsCollateralAmortizedCost
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The fair value of investment securities available for sale pledged as collateral for government public funds held by the bank, as of the date indicated.

No definition available.

Name:	rvsb_InvestmentSecuritiesAvailableForSalePledgedAsCollateralFairValue
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the monetary amount of InvestmentSecuritiesGrossRealizedGainsFromSales, during the indicated time period.

No definition available.

Name:	rvsb_InvestmentSecuritiesGrossRealizedGainsFromSales
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amortized cost of investment securities held to maturity pledged as collateral for government public funds held by the bank, as of the date indicated.

No definition available.

Name:	rvsb_InvestmentSecuritiesHeldToMaturityPledgedAsCollateralAmortizedCost
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The fair value of investment securities held to maturity pledged as collateral for government public funds held by the bank, as of the date indicated.

No definition available.

Name:	rvsb_InvestmentSecuritiesHeldToMaturityPledgedAsCollateralFairValue
Namespace Prefix:	rvsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

It represent Bank Holding Companies Issuing Trust Preferred Securities

No definition available.

Name:	rvsb_NumberOfBankHoldingCompaniesIssuingTrustPreferredSecurities
Namespace Prefix:	rvsb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

It represent number of trouble debt restructuring contract.

No definition available.

Name:	rvsb_NumberOfTroubleDebtRestructuringContract
Namespace Prefix:	rvsb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

It represent percentage of defaulted.

No definition available.

Name:	rvsb_PercentageOfDefaulted
Namespace Prefix:	rvsb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

It represent percentage of delinquent loan amount.

No definition available.

Name:	rvsb_PercentageOfDelinquentLoanAmount
Namespace Prefix:	rvsb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

It represent percentage of estimated an expected default rate.

No definition available.

Name:	rvsb_PercentageOfEstimatedDefaultRate
Namespace Prefix:	rvsb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563