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OTHER REAL ESTATE OWNED AND OTHER REPOSSESSED ASSETS - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Residential |  |
Real Estate Properties [Line Items] |  |
Residential real estate in the process of foreclosure | $ 0.3 | $ 1.1

X
- Definition Represents the value of real estate loans in the process of foreclosure at period end. + References No definition available. + Details
Name: | buse_RealEstateInForeclosure
Namespace Prefix: | buse_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CollateralAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |