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SIGNIFICANT ACCOUNTING POLICIES - Securities (Details) $ in Millions	Dec. 31, 2024 USD ($)
Accounting Policies [Abstract]
Debt securities, accrued interest	$ 10.5

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- Definition

Debt Securities, Accrued Interest

+ References

No definition available.

+ Details

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Namespace Prefix:	buse_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration