XML 77 R66.htm IDEA: XBRL DOCUMENT
v3.20.2

Outstanding Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Credit Commitments and Contingencies |  |  |  |
Adoption of CECL, reserve for unfunded commitments | $ 7,300 | $ 7,300 | $ 5,500 |
Adoption of CECL, additional provision | 300 | 1,800 |  |
Commitments to extend credit |  |  |  |
Credit Commitments and Contingencies |  |  |  |
Financial instruments whose contract amounts represent credit risk: | 1,721,099 | 1,721,099 |  | $ 1,649,565
Standby letters of credit |  |  |  |
Credit Commitments and Contingencies |  |  |  |
Financial instruments whose contract amounts represent credit risk: | $ 41,791 | $ 41,791 |  | $ 42,581

X
- Definition Represents the increase (decrease) amount of reserve for unfunded commitments. + References No definition available. + Details
Name: | buse_IncreaseDecreaseInReserveForUnfundedCommitments
Namespace Prefix: | buse_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the reserve for unfunded commitments. + References No definition available. + Details
Name: | buse_ReserveForUnfundedCommitments
Namespace Prefix: | buse_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
Name: | us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
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_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |