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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY |  |  |
Cash dividends, common stock (in dollars per share) | $ 0.84 | $ 0.80 | $ 0.72
Stock dividends, restricted stock units (in dollars per share) | $ 0.84 | $ 0.80 | 0.72
Stock dividends, accrued restricted stock awards (in dollars per share) |  |  | $ 0.54

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- Definition This element represents the equity impact of stock dividend accrued per share of restricted awards, with the acquisition of Pulaski by the entity during the period. + References No definition available. + Details
Name: | buse_CommonStockDividendsPerRestrictedStockShareAccrued
Namespace Prefix: | buse_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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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: | num: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=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix: | us-gaap_
Data Type: | num: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