XML 60 R49.htm IDEA: XBRL DOCUMENT
v3.19.2

Borrowings - Maturity period (Details) | 6 Months Ended
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Jun. 30, 2019
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

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- 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