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SIGNIFICANT ACCOUNTING POLICIES - Trust Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Assets under care	$ 13,830	$ 12,140

X

- Definition

Assets under care held for customers, that are not included in the Company's consolidated financial statements.

+ References

No definition available.

+ Details

Name:	buse_CustomerAssetsHeldInTrust
Namespace Prefix:	buse_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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