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Deposits - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Maturities Of Time Deposits [Abstract] |  |
Brokered time deposits | $ 67.1 | $ 113.8

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- Definition Brokered time deposits. + References No definition available. + Details
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Namespace Prefix: | rbb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration