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v3.20.1

Borrowings - Maturity period (Details) | 3 Months Ended
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Mar. 31, 2020
Maturity period |
Maximum maturity period of short-term debt | 1 year

X
- Definition Relates to maturities of debt. + References No definition available. + Details
Name: | buse_DebtMaturityPeriodAbstract
Namespace Prefix: | buse_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum maturity period of short-term debt. + References No definition available. + Details
Name: | buse_ShortTermDebtMaturityPeriodMaximum
Namespace Prefix: | buse_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration