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Note 4 - Loans and Allowance for Credit Losses - Loans - Schedule of Financing Receivables, Nonaccrual Status (Details) - USD ($)
$ in Thousands

Dec. 31, 2024

Dec. 31, 2023

Nonaccrual with no allowance for credit loss

$ 36,318

$ 30,219

Non-accrual Loans

69,843

^[1]

31,619

Construction And Land Development Loans [Member]

Nonaccrual with no allowance for credit loss

18,226

0

Non-accrual Loans

44,621

0

Commercial Real Estate Portfolio Segment [Member]

Nonaccrual with no allowance for credit loss

346

10,569

Non-accrual Loans

7,353

10,569

Single Family Residential Mortgages Loans [Member]

Nonaccrual with no allowance for credit loss

11,524

18,103

Non-accrual Loans

11,524

18,103

Commercial and Industrial [Member]

Nonaccrual with no allowance for credit loss

^[2]

4,708

610

Non-accrual Loans

^[2]

4,819

854

SBA Loans [Member]

Nonaccrual with no allowance for credit loss

1,514

937

Non-accrual Loans

1,514

2,085

Other Loans [Member]

Nonaccrual with no allowance for credit loss

0

0

Non-accrual Loans

$ 12

$ 8

[1]	Included in total loans
[2]	A C&I loan of $4.7 million is secured by a SFR and is cross collateralized with a CRE loan with a specific reserve.

X

- Definition

Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

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

X

- Definition

Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (3)
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (2)
-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=rbb_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=rbb_SBALoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: