XML 97 R86.htm IDEA: XBRL DOCUMENT
v3.20.2

Note 17 - Fair Value Measurements (Details Textual) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Write Down on Other Real Estate Owned | $ 0 |
Assets, Fair Value Disclosure |  | $ 126,069,000
Other Real Estate Owned [Member] | Single-Family Residences [Member] |  |
Number of Real Estate Properties | 1 |
Assets, Fair Value Disclosure | $ 293,000 |

X
- Definition Represents write down on other real estate owned. + References No definition available. + Details
Name: | rbb_WriteDownOnOtherRealEstateOwned
Namespace Prefix: | rbb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rbb_OtherRealEstateOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=rbb_SinglefamilyResidencesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |