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EMPLOYEE BENEFIT PLANS - Narrative (Details) | 12 Months Ended
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Dec. 31, 2023
Employee Benefit Plans |
Employer matching contribution, percent of match | 100.00%
Employer matching contribution, percent of employees' gross pay | 3.00%
Employer matching contribution, percent of next match | 50.00%
Employer next matching contribution, percent of employees' gross pay | 2.00%
Vesting period | 5 years

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- Definition Defined Contribution Plan, Second Employer Matching Contribution, Percent of Employees' Gross Pay + References No definition available. + Details
Name: | buse_DefinedContributionPlanSecondEmployerMatchingContributionPercentOfEmployeesGrossPay
Namespace Prefix: | buse_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Contribution Plan, Second Employer Matching Contribution, Percent of Second Match + References No definition available. + Details
Name: | buse_DefinedContributionPlanSecondEmployerMatchingContributionPercentOfSecondMatch
Namespace Prefix: | buse_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period during which the rights of the participants vest under the defined contribution plans. + References No definition available. + Details
Name: | buse_DefinedContributionPlanVestingPeriod
Namespace Prefix: | buse_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Employee Benefit Plans + References No definition available. + Details
Name: | buse_EmployeeBenefitPlansDisclosureAbstract
Namespace Prefix: | buse_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration