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Loans and Allowance for Credit Losses (Schedule of amortized cost basis of only those individually analyzed loans with a related ACL) (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Individually analyzed loans	$ 1,176
Related ACL	749
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Individually analyzed loans	975
Related ACL	710
Consumer | Indirect automobile
Loans and Leases Receivable Disclosure [Line Items]
Individually analyzed loans	201
Related ACL	$ 39

X

- Definition

Amount of valuation allowance for financing receivables with related allowances that were individually evaluated for impairment.

+ References

No definition available.

+ Details

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X

- Definition

The balance of financing receivables that were individually evaluated for impairment with related allowances.

+ References

No definition available.

+ Details

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Namespace Prefix:	rbkb_
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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

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X

- Details

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X

- Details

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X

- Details

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