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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: