LOANS AND ALLOWANCE - credit risk profile of the Corporation's loan portfolio based on rating category (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 257,622	$ 257,099
Loans Receivable
Financing Receivable, Recorded Investment [Line Items]
Construction	6,753	8,308
1-4 family residential	111,330	111,198
Multi-family residential	18,267	18,582
Nonresidential	101,512	83,284
Land	16,540	19,081
Commercial	19,414	17,349
Consumer	3,668	3,840
Total loans, gross	277,484	261,642
Loans Receivable \| Pass
Financing Receivable, Recorded Investment [Line Items]
Construction	6,632	8,308
1-4 family residential	101,551	100,827
Multi-family residential	17,150	16,616
Nonresidential	94,057	75,966
Land	11,818	13,457
Commercial	18,790	16,685
Consumer	3,654	3,796
Total loans, gross	253,652	235,655
Loans Receivable \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Construction
1-4 family residential	3,684	2,891
Multi-family residential
Nonresidential	3,606	3,441
Land	258	505
Commercial	3	329
Consumer		22
Total loans, gross	7,551	7,188
Loans Receivable \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Construction	121
1-4 family residential	6,095	7,429
Multi-family residential	1,117	1,966
Nonresidential	3,849	3,877
Land	4,464	5,119
Commercial	621	335
Consumer	14	22
Total loans, gross	16,281	18,748
Loans Receivable \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Construction
1-4 family residential		51
Multi-family residential
Nonresidential
Land
Commercial
Consumer
Total loans, gross		51
Loans Receivable \| Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	6,753	8,308
Loans Receivable \| One-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	111,330	111,198
Loans Receivable \| Multi-family residential
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	18,267	18,582
Loans Receivable \| Nonresidential
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	101,512	83,284
Loans Receivable \| Land
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	16,540	19,081
Loans Receivable \| Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	19,414	17,349
Loans Receivable \| Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans, gross	$ 3,668	$ 3,840

Loans and Leases Receivable, Gross, Consumer, Multi Family Real Estate

No definition available.

Name:	rivr_LoansAndLeasesReceivableGrossConsumerMultiFamilyRealEstate
Namespace Prefix:	rivr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before allowance of consumer real estate loans. Includes, but not limited to, construction financing, One To Four Family Residential Real Estate lines of credit. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

No definition available.

+ Details

Name:	rivr_LoansAndLeasesReceivableGrossConsumerOneToFourFamily
Namespace Prefix:	rivr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before allowance of loans issued to Nonresidential real estate and agricultural land. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

No definition available.

+ Details

Name:	rivr_LoansAndLeasesReceivableNonresidentialRealEstateAndAgriculturalLand
Namespace Prefix:	rivr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before allowance of consumer land (not used for agricultural purposes) loans. Includes, lines of credit. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

No definition available.

+ Details

Name:	rivr_LoansReceivableLandNotUsedForAgriculturalPurposesGross
Namespace Prefix:	rivr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

No definition available.

+ Details

Name:	rivr_LoansReceivableOtherCommercialRealEstateGross
Namespace Prefix:	rivr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount before allowance of loans issued to build, improve or remodel a residential home. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a, b

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a)(2),(b))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph c(ii)

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 52

-IssueDate 2006-05-01

-Chapter 8

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableConsumerConstruction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before allowance of consumer loans and leases not otherwise specified in the taxonomy. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a)(7),(b))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_LoansAndLeasesReceivableConsumerOther
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant