XML 76 R63.htm IDEA: XBRL DOCUMENT
v3.25.3

PORTFOLIO LOANS - Schedule of Loan Modifications for Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Interest Rate Reduction |  |  |  |
Loans identified as impaired |  |  |  |
Amortized cost basis | $ 263 |  | $ 263 |
% of total class of financing receivable | 0.00% |  | 0.00% |
Interest Rate Reduction | Commercial loans | C&I and other commercial |  |  |  |
Loans identified as impaired |  |  |  |
Amortized cost basis | $ 263 |  | $ 263 |
% of total class of financing receivable | 0.00% |  | 0.00% |
Interest Rate Reduction | Commercial loans | CRE |  |  |  |
Loans identified as impaired |  |  |  |
Amortized cost basis | $ 0 |  | $ 0 |
% of total class of financing receivable | 0.00% |  | 0.00% |
Interest Rate Reduction | Commercial loans | Real estate construction |  |  |  |
Loans identified as impaired |  |  |  |
Amortized cost basis |  |  | $ 0 |
% of total class of financing receivable |  |  | 0.00% |
Payment Deferral |  |  |  |
Loans identified as impaired |  |  |  |
Amortized cost basis | $ 4,388 | $ 325 | $ 14,949 | $ 325
% of total class of financing receivable | 0.00% | 0.00% | 0.10% | 0.00%
Payment Deferral | Commercial loans | C&I and other commercial |  |  |  |
Loans identified as impaired |  |  |  |
Amortized cost basis | $ 2,444 | $ 325 | $ 13,005 | $ 325
% of total class of financing receivable | 0.10% | 0.00% | 0.30% | 0.00%
Payment Deferral | Commercial loans | CRE |  |  |  |
Loans identified as impaired |  |  |  |
Amortized cost basis | $ 1,944 | $ 0 | $ 1,944 | $ 0
% of total class of financing receivable | 0.00% | 0.00% | 0.00% | 0.00%
Payment Deferral | Commercial loans | Real estate construction |  |  |  |
Loans identified as impaired |  |  |  |
Amortized cost basis |  | $ 0 | $ 0 | $ 0
% of total class of financing receivable |  | 0.00% | 0.00% | 0.00%
Term Extension |  |  |  |
Loans identified as impaired |  |  |  |
Amortized cost basis | $ 10,878 | $ 38,235 | $ 28,302 | $ 53,105
% of total class of financing receivable | 0.10% | 0.50% | 0.20% | 0.70%
Term Extension | Commercial loans | C&I and other commercial |  |  |  |
Loans identified as impaired |  |  |  |
Amortized cost basis | $ 10,417 | $ 14,537 | $ 22,314 | $ 28,073
% of total class of financing receivable | 0.20% | 0.80% | 0.50% | 1.50%
Term Extension | Commercial loans | CRE |  |  |  |
Loans identified as impaired |  |  |  |
Amortized cost basis | $ 461 | $ 18,448 | $ 823 | $ 19,782
% of total class of financing receivable | 0.00% | 0.50% | 0.00% | 0.60%
Term Extension | Commercial loans | Real estate construction |  |  |  |
Loans identified as impaired |  |  |  |
Amortized cost basis |  | $ 5,250 | $ 5,165 | $ 5,250
% of total class of financing receivable |  | 1.30% | 0.50% | 1.30%

X
- Definition Amortized cost excluding accrued interest, 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables. + 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 + Details
Name: | us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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 Reference 1: 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 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-34 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -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 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 Reference 5: 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 + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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