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SIGNIFICANT ACCOUNTING POLICIES - Leases (Details)	Dec. 31, 2025 lease
Accounting Policies [Abstract]
Number of finance leases	1

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- Definition

Number Of Finance Leases

+ References

No definition available.

+ Details

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Namespace Prefix:	buse_
Data Type:	xbrli:integerItemType
Balance Type:	na
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