XML 60 R50.htm IDEA: XBRL DOCUMENT
v3.23.1

Portfolio Loans -Summary of portfolio loans that are past due and still accruing or on a non-accrual status (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | $ 7,783,808 | $ 7,725,702
90 days past due and still accruing | 500 | 673
Non-accrual Loans | 14,714 | 15,067
30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 4,295 | 5,249
60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 1,177 | 1,299
Past due and non-accrual commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 5,815,703 | 5,766,496
90 days past due and still accruing | 0 | 0
Non-accrual Loans | 10,971 | 11,818
Past due and non-accrual commercial loans | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 522 | 126
Past due and non-accrual commercial loans | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 1 | 0
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 1,937,158 | 1,974,154
90 days past due and still accruing | 0 | 0
Non-accrual Loans | 5,410 | 6,174
Commercial | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 78 | 2
Commercial | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 1 | 0
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 3,324,536 | 3,261,873
90 days past due and still accruing | 0 | 0
Non-accrual Loans | 5,561 | 5,644
Commercial real estate | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 444 | 124
Commercial real estate | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 0 | 0
Past due and non-accrual retail loans |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 1,968,105 | 1,959,206
90 days past due and still accruing | 500 | 673
Non-accrual Loans | 3,743 | 3,249
Past due and non-accrual retail loans | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 3,773 | 5,123
Past due and non-accrual retail loans | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 1,176 | 1,299
Retail real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 1,667,537 | 1,657,082
90 days past due and still accruing | 472 | 673
Non-accrual Loans | 3,699 | 3,096
Retail real estate | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 3,120 | 4,709
Retail real estate | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 1,169 | 1,239
Retail other |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 300,568 | 302,124
90 days past due and still accruing | 28 | 0
Non-accrual Loans | 44 | 153
Retail other | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 653 | 414
Retail other | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | $ 7 | $ 60

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=buse_RetailLoansMember
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: |

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