XML 71 R61.htm IDEA: XBRL DOCUMENT
v3.22.2

Regulatory Capital (Details) - USD ($) $ in Thousands | Jun. 02, 2022 | May 25, 2017 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount |  |  |  |
Actual, Amount |  |  | $ 1,031,356 | $ 995,874
Minimum Capital Requirement, Amount |  |  | 394,196 | 378,334
Minimum To Be Well Capitalized, Amount |  |  | $ 569,394 | $ 546,482
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio |  |  |  |
Actual, Ratio (as a percent) |  |  | 11.77% | 11.85%
Minimum Capital Requirement, Ratio (as a percent) |  |  | 4.50% | 4.50%
Minimum To Be Well Capitalized, Ratio (as a percent) |  |  | 6.50% | 6.50%
Tier 1 Capital to Risk Weighted Assets, Amount |  |  |  |
Actual, Amount |  |  | $ 1,105,356 | $ 1,069,874
Minimum Capital Requirement, Amount |  |  | 525,594 | 504,445
Minimum To Be Well Capitalized, Amount |  |  | $ 700,792 | $ 672,594
Tier 1 Capital to Risk Weighted Assets, Ratio |  |  |  |
Actual, Ratio (as a percent) |  |  | 12.62% | 12.73%
Minimum Capital Requirement, Ratio (as a percent) |  |  | 6.00% | 6.00%
Minimum To Be Well Capitalized, Ratio (as a percent) |  |  | 8.00% | 8.00%
Total Capital to Risk Weighted Assets, Amount |  |  |  |
Actual, Amount |  |  | $ 1,452,813 | $ 1,320,187
Minimum Capital Requirement, Amount |  |  | 700,792 | 672,594
Minimum To Be Well Capitalized, Amount |  |  | $ 875,990 | $ 840,742
Total Capital to Risk Weighted Assets, Ratio |  |  |  |
Actual, Ratio (as a percent) |  |  | 16.58% | 15.70%
Minimum Capital Requirement, Ratio (as a percent) |  |  | 8.00% | 8.00%
Minimum To Be Well Capitalized, Ratio (as a percent) |  |  | 10.00% | 10.00%
Leverage Ratio of Tier 1 Capital to Average Assets, Amount |  |  |  |
Actual, Amount |  |  | $ 1,105,356 | $ 1,069,874
Minimum Capital Requirement, Amount |  |  | $ 489,513 | $ 502,336
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio |  |  |  |
Actual, Ratio (as a percent) |  |  | 9.03% | 8.52%
Minimum Capital Requirement, Ratio (as a percent) |  |  | 4.00% | 4.00%
Busey Bank |  |  |  |
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount |  |  |  |
Actual, Amount |  |  | $ 1,265,418 | $ 1,241,303
Minimum Capital Requirement, Amount |  |  | 392,637 | 377,096
Minimum To Be Well Capitalized, Amount |  |  | $ 567,142 | $ 544,695
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio |  |  |  |
Actual, Ratio (as a percent) |  |  | 14.50% | 14.81%
Minimum Capital Requirement, Ratio (as a percent) |  |  | 4.50% | 4.50%
Minimum To Be Well Capitalized, Ratio (as a percent) |  |  | 6.50% | 6.50%
Tier 1 Capital to Risk Weighted Assets, Amount |  |  |  |
Actual, Amount |  |  | $ 1,265,418 | $ 1,241,303
Minimum Capital Requirement, Amount |  |  | 523,516 | 502,795
Minimum To Be Well Capitalized, Amount |  |  | $ 698,021 | $ 670,394
Tier 1 Capital to Risk Weighted Assets, Ratio |  |  |  |
Actual, Ratio (as a percent) |  |  | 14.50% | 14.81%
Minimum Capital Requirement, Ratio (as a percent) |  |  | 6.00% | 6.00%
Minimum To Be Well Capitalized, Ratio (as a percent) |  |  | 8.00% | 8.00%
Total Capital to Risk Weighted Assets, Amount |  |  |  |
Actual, Amount |  |  | $ 1,339,875 | $ 1,306,616
Minimum Capital Requirement, Amount |  |  | 698,021 | 670,394
Minimum To Be Well Capitalized, Amount |  |  | $ 872,526 | $ 837,992
Total Capital to Risk Weighted Assets, Ratio |  |  |  |
Actual, Ratio (as a percent) |  |  | 15.36% | 15.59%
Minimum Capital Requirement, Ratio (as a percent) |  |  | 8.00% | 8.00%
Minimum To Be Well Capitalized, Ratio (as a percent) |  |  | 10.00% | 10.00%
Leverage Ratio of Tier 1 Capital to Average Assets, Amount |  |  |  |
Actual, Amount |  |  | $ 1,265,418 | $ 1,241,303
Minimum Capital Requirement, Amount |  |  | 488,139 | 501,104
Minimum To Be Well Capitalized, Amount |  |  | $ 610,174 | $ 626,379
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio |  |  |  |
Actual, Ratio (as a percent) |  |  | 10.37% | 9.91%
Minimum Capital Requirement, Ratio (as a percent) |  |  | 4.00% | 4.00%
Minimum To Be Well Capitalized, Ratio (as a percent) |  |  | 5.00% | 5.00%
Subordinated debt | Fixed-to-floating rate notes due 2027 |  |  |  |
Regulatory Capital |  |  |  |
Redemption amount |  | $ 60,000 |  |
Term of debt instrument |  | 5 years |  |
Subordinated debt | Fixed-to-floating rate notes due 2032 |  |  |  |
Regulatory Capital |  |  |  |
Principal balance | $ 100,000 |  |  |
Fixed to floating interest rate (as a percent) | 5.00% |  |  |

X
- Definition Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework as a percent. + References No definition available. + Details
Name: | buse_CapitalRequiredForCapitalAdequacyToRiskWeightedAssetsPercent
Namespace Prefix: | buse_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action as a percent. + References No definition available. + Details
Name: | buse_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssetsPercent
Namespace Prefix: | buse_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | buse_CapitalToRiskBasedRatiosAbstract
Namespace Prefix: | buse_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratio of total risk-based capital to risk-weighted assets as defined by regulatory framework as a percent. + References No definition available. + Details
Name: | buse_CapitalToRiskWeightedAssetsPercent
Namespace Prefix: | buse_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | buse_CommonEquityRiskBasedRatiosAbstract
Namespace Prefix: | buse_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Common equity Tier 1 Risk Based Capital as defined in the regulations. + References No definition available. + Details
Name: | buse_CommonEquityTierOneRiskBasedCapital
Namespace Prefix: | buse_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | buse_CommonEquityTierOneRiskBasedCapitalAbstract
Namespace Prefix: | buse_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum amount of Common equity Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
Name: | buse_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy
Namespace Prefix: | buse_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum Common equity Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
Name: | buse_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix: | buse_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of Common equity Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References No definition available. + Details
Name: | buse_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized
Namespace Prefix: | buse_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the common equity Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as (well capitalized) under the regulatory framework for prompt corrective action. + References No definition available. + Details
Name: | buse_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix: | buse_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Common equity Tier 1 capital divided by risk weighted assets as defined by regulations. + References No definition available. + Details
Name: | buse_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets
Namespace Prefix: | buse_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of redemption of debt instrument. + References No definition available. + Details
Name: | buse_DebtInstrumentRedemptionAmount
Namespace Prefix: | buse_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework. + References No definition available. + Details
Name: | buse_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssetsPercent
Namespace Prefix: | buse_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action as a percent. + References No definition available. + Details
Name: | buse_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssetsPercent
Namespace Prefix: | buse_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of Tier 1 capital to average assets as defined by regulatory framework as a percent. + References No definition available. + Details
Name: | buse_TierOneLeverageCapitalToAverageAssetsPercent
Namespace Prefix: | buse_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework as a percent. + References No definition available. + Details
Name: | buse_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsPercent
Namespace Prefix: | buse_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action as a percent. + References No definition available. + Details
Name: | buse_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssetsPercent
Namespace Prefix: | buse_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework as a percent. + References No definition available. + Details
Name: | buse_TierOneRiskBasedCapitalToRiskWeightedAssetsPercent
Namespace Prefix: | buse_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_Capital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CapitalAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 + Details
Name: | us-gaap_CapitalRequiredForCapitalAdequacy
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of minimum total risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_CapitalRequiredToBeWellCapitalized
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_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The average effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LeverageRatiosAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RiskBasedRatiosAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of Tier 1 leverage capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_TierOneLeverageCapitalAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of minimum Tier 1 leverage capital required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of minimum Tier 1 leverage capital categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of Tier 1 risk-based capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_TierOneRiskBasedCapitalAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of minimum Tier 1 risk-based capital required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of minimum Tier 1 risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=buse_BuseyBankMember
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_FixedToFloatingRateNotesDue2027Member
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: |