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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) |  |  |  |
Cash dividends, common stock (in dollars per share) | $ 0.23 | $ 0.23 | $ 0.46 | $ 0.46
Stock dividends, restricted stock units (in dollars per share) | $ 0.23 | $ 0.23 | $ 0.46 | $ 0.46

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- Definition This element represents the equity impact of stock dividend equivalents per share of restricted/deferred stock units declared by the entity during the period. + References No definition available. + Details
Name: | buse_CommonStockDividendsPerRestrictedStockShareDeclared
Namespace Prefix: | buse_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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