XML 265 R108.htm IDEA: XBRL DOCUMENT
v3.22.4

BORROWINGS - Schedule of unamortized debt issuance cost (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Junior subordinated debt owed to unconsolidated trusts |  |
Total unamortized debt issuance costs | $ 2,962 | $ 2,283
Senior notes issued in 2017 | Senior Notes |  |
Junior subordinated debt owed to unconsolidated trusts |  |
Total unamortized debt issuance costs | 0 | 56
Subordinated notes issued in 2017 | Subordinated Debt |  |
Junior subordinated debt owed to unconsolidated trusts |  |
Total unamortized debt issuance costs | 0 | 549
Subordinated notes issued in 2020 | Subordinated Debt |  |
Junior subordinated debt owed to unconsolidated trusts |  |
Total unamortized debt issuance costs | 1,220 | 1,678
Subordinated notes issued in 2022 | Subordinated Debt |  |
Junior subordinated debt owed to unconsolidated trusts |  |
Total unamortized debt issuance costs | $ 1,742 | $ 0

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

X
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
Name: | us-gaap_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=buse_May252022MaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=buse_May252027MaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SubordinatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=buse_June12030MaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=buse_FixedToFloatingRateNotesDue2032Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |