XML 132 R90.htm IDEA: XBRL DOCUMENT
v3.20.1

Related Party Transactions - Additional Information (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Executive Officers, Directors and their Related Interests |  |
Related Party Transaction [Line Items] |  |
Loan commitments outstanding to related parties | $ 0 | $ 800,000
Principal Officers, Directors and their Affiliates |  |
Related Party Transaction [Line Items] |  |
Deposits from related parties | $ 84,600,000 | $ 52,100,000

X
- Definition Loan commitments available to related parties. + References No definition available. + Details
Name: | rbb_LoanCommitmentsAvailableToRelatedParties
Namespace Prefix: | rbb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deposits held by the entity for a related party (entity, shareholder, employee). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_RelatedPartyDepositLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rbb_ExecutiveOfficersDirectorsAndTheirRelatedInterestsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rbb_PrincipalOfficersDirectorsAndTheirAffiliatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |