XML 53 R42.htm IDEA: XBRL DOCUMENT
v3.19.1

Portfolio loans - Narrative (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) contract | Mar. 31, 2018 USD ($) loan | Dec. 31, 2018 USD ($)
Portfolio Loans |  |  |
Net deferred loan origination costs | $ 5,400,000 |  | $ 5,600,000
Amount of loan reduction due to net accretable purchase accounting adjustments | 28,200,000 |  | $ 13,900,000
Gross interest income that would have been recorded if impaired loans had been current | $ 700,000 | $ 400,000 |
Loans newly classified as troubled debt restructurings (“TDR”) |  | $ 0 |
TDRs subsequently classified as non-performing and had payment defaults | 0 | 0 |
Minimum days past due for TDR loans to be classified as non-performing | 90 days |  |
Balance of all acquired loans | $ 2,000,000,000 |  |
Retail real estate |  |  |
Portfolio Loans |  |  |
Loans in the process of foreclosure | 3,400,000 |  |
Maximum | Commercial real estate |  |  |
Portfolio Loans |  |  |
Limit where loans are processed through an expedited underwriting process | 1,000,000 |  |
Pass and watch | Commercial |  |  |
Portfolio Loans |  |  |
Limit where loans are processed through an expedited underwriting process | 350,000 |  |
Pass and watch | Minimum | Commercial |  |  |
Portfolio Loans |  |  |
Limit where loans are processed through an expedited underwriting process | 350,000 |  |
Pass and watch | Maximum | Commercial |  |  |
Portfolio Loans |  |  |
Limit where loans are processed through an expedited underwriting process | 1,000,000 |  |
Watch | Commercial |  |  |
Portfolio Loans |  |  |
Limit above which loans are annually reviewed | 1,000,000 |  |
Special Mention |  |  |
Portfolio Loans |  |  |
Limit above which loans are annually reviewed | 350,000 |  |
In compliance with modified terms |  |  |
Portfolio Loans |  |  |
Loans newly classified as troubled debt restructurings (“TDR”) | $ 3,100,000 |  |
In compliance with modified terms | Commercial |  |  |
Portfolio Loans |  |  |
Performing loans classified as TDRs | loan |  | 1 |

X
- Definition Minimum days past due for TDR loans to be classified as non-performing. + References No definition available. + Details
Name: | buse_FinancingReceivableModificationsDefaultedMinimumPeriodPastDueToBeClassifiedAsNonPerforming
Namespace Prefix: | buse_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the limit of loan above which loans are reviewed annually. + References No definition available. + Details
Name: | buse_LoansAndLeasesReceivableLimitAboveWhichLoansAreAnnuallyReviewed
Namespace Prefix: | buse_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the limit of loan where loans are processed through an expedited underwriting process. + References No definition available. + Details
Name: | buse_LoansAndLeasesReceivableLimitAboveWhichLoansAreProcessedThroughExpeditedUnderwritingProcess
Namespace Prefix: | buse_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of loans increased (decrease) due to net accretable purchase accounting adjustments. + References No definition available. + Details
Name: | buse_LoansAndLeasesReceivablePeriodIncreaseDecreaseDueToNetAccretablePurchaseAccountingAdjustments
Namespace Prefix: | buse_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents loans that are in the process of foreclosure. + References No definition available. + Details
Name: | buse_LoansInProcessOfForeclosure
Namespace Prefix: | buse_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationAcquiredReceivablesFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
Name: | us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of receivables for which the allowance for credit losses had previously been measured under a general allowance for credit losses methodology, and are now identified as troubled debt restructurings. + References No definition available. + Details
Name: | us-gaap_ReceivablesChangeInMethodOfCalculatingImpairmentRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=buse_LoansInHighestGradesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=buse_WatchListMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PerformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |