XML 78 R68.htm IDEA: XBRL DOCUMENT
v3.23.3

Borrowings - Schedule of Short-term Borrowings (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) note
Short-Term Debt [Line Items] |  |
Total short-term debt | $ 12,000,000 | $ 351,054,000
Weighted average rate for securities sold under agreements to repurchase | 3.07% | 1.91%
Weighted average maturity period for securities sold under agreements to repurchase |  | 5 days
Federal funds purchased | $ 0 | $ 0
FHLB advances maturing in less than one year from date of origination, and the current portion of long-term FHLB advances due within 12 months |  |
Short-Term Debt [Line Items] |  |
Total short-term debt | 0 | 339,054,000
Term Loan, current portion due within 12 months |  |
Short-Term Debt [Line Items] |  |
Total short-term debt | $ 12,000,000 | $ 12,000,000
Federal Home Loan Bank Certificates and Obligations (FHLB) |  |
Short-Term Debt [Line Items] |  |
Number of notes | note |  | 4
Weighted average rate for securities sold under agreements to repurchase |  | 4.28%
Minimum |  |
Short-Term Debt [Line Items] |  |
Short-term borrowings, mature period | 1 day |
Maximum |  |
Short-Term Debt [Line Items] |  |
Short-term borrowings, mature period | 90 days |

X
- Definition Debt, Weighted Average Maturity Period + References No definition available. + Details
Name: | buse_DebtWeightedAverageMaturityPeriod
Namespace Prefix: | buse_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of federal funds, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | buse_FederalFundsMaturityPeriod
Namespace Prefix: | buse_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Notes Payable, Number of Notes + References No definition available. + Details
Name: | buse_NotesPayableNumberOfNotes
Namespace Prefix: | buse_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_FederalFundsPurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481372/852-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_ShortTermBorrowings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_ShortTermDebtLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_FederalHomeLoanBankAdvancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortTermDebtTypeAxis=buse_ShortTermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |