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v3.23.1

Portfolio Loans - Summary of the financial effect of modifications (Details) | 3 Months Ended
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Mar. 31, 2023
Loans identified as impaired |
Total financial effect | 8 months
Commercial |
Loans identified as impaired |
Total financial effect | 9 months 3 days
Commercial real estate |
Loans identified as impaired |
Total financial effect | 5 months 24 days

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- Definition Financing Receivable, Modified, Weighted Average Term Increase from Modification + References No definition available. + Details
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Namespace Prefix: | buse_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |