XML 63 R51.htm IDEA: XBRL DOCUMENT
v3.22.1

Loans and Allowance for loan losses (Schedule of classes of the loan portfolio by the aging categories of performing loans and nonaccrual loans) (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total gross loans | $ 853,458,000 | $ 876,616,000
Nonaccrual | 6,689,000 | 6,335,000
Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | 0
Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 839,966,000 | 858,608,000
30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 6,697,000 | 11,616,000
60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,643,000 | 1,853,000
Greater Than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 5,152,000 | 4,539,000
Indirect automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total gross loans | 382,088,000 | 376,260,000
Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total gross loans | 311,589,000 | 284,120,000
Commercial real estate | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total gross loans | 10,095,000 | 5,392,000
Commercial real estate | Construction | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 10,095,000 | 5,392,000
Commercial real estate | Non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total gross loans | 245,568,000 | 248,349,000
Nonaccrual | 2,721,000 | 1,944,000
Commercial real estate | Non-residential | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 242,205,000 | 244,387,000
Commercial real estate | Non-residential | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 115,000 | 1,985,000
Commercial real estate | Non-residential | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 527,000 | 33,000
Commercial real estate | Non-residential | Greater Than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 2,721,000 | 1,944,000
Commercial real estate | Multifamily |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total gross loans | 55,926,000 | 30,379,000
Commercial real estate | Multifamily | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 55,926,000 | 30,379,000
Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total gross loans | 35,646,000 | 39,239,000
Nonaccrual | 2,230,000 | 2,641,000
Residential | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 34,363,000 | 36,581,000
Residential | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 57,000 | 1,351,000
Residential | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 242,000 | 138,000
Residential | Greater Than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 984,000 | 1,169,000
Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total gross loans | 104,323,000 | 154,016,000
Nonaccrual | 687,000 | 366,000
Commercial and industrial | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 103,517,000 | 151,771,000
Commercial and industrial | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 246,000 | 1,551,000
Commercial and industrial | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current |  | 511,000
Commercial and industrial | Greater Than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 560,000 | 183,000
Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total gross loans | 19,812,000 | 22,981,000
Consumer | Indirect automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total gross loans | 382,088,000 | 376,260,000
Nonaccrual | 734,000 | 990,000
Consumer | Indirect automobile | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 374,729,000 | 367,929,000
Consumer | Indirect automobile | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 5,977,000 | 6,321,000
Consumer | Indirect automobile | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 715,000 | 1,063,000
Consumer | Indirect automobile | Greater Than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 667,000 | 947,000
Consumer | Home equity |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total gross loans | 11,857,000 | 14,165,000
Nonaccrual | 270,000 | 346,000
Consumer | Home equity | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 11,429,000 | 13,506,000
Consumer | Home equity | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 149,000 | 310,000
Consumer | Home equity | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 106,000 | 101,000
Consumer | Home equity | Greater Than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 173,000 | 248,000
Consumer | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total gross loans | 7,955,000 | 8,816,000
Nonaccrual | 47,000 | 48,000
Consumer | Other consumer | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 7,702,000 | 8,663,000
Consumer | Other consumer | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 153,000 | 98,000
Consumer | Other consumer | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 53,000 | 7,000
Consumer | Other consumer | Greater Than 90 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | $ 47,000 | $ 48,000

X
- Definition Amount of financing receivable 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1404 -Paragraph (a) + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_AutomobileLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rbkb_NonResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_MultifamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rbkb_OtherConsumerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |