XML 102 R90.htm IDEA: XBRL DOCUMENT
v3.24.0.1

PORTFOLIO LOANS - Schedule of TDRs (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) contract | Dec. 31, 2021 USD ($) contract
Financing Receivable, Impaired [Line Items] |  |
Number of Contracts | contract | 4 | 1
Rate Modification |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | $ 136 | $ 364
Payment Modification |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | $ 1,513 | $ 0
Commercial |  |
Financing Receivable, Impaired [Line Items] |  |
Number of Contracts | contract | 3 | 1
Commercial | Rate Modification |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | $ 136 | $ 364
Commercial | Payment Modification |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | $ 996 | $ 0
Retail real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Number of Contracts | contract | 1 |
Retail real estate | Rate Modification |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | $ 0 |
Retail real estate | Payment Modification |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment | $ 517 |

X
- 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
Name: | us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=buse_RateModificationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=buse_PaymentModificationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=buse_RetailRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |