Capital (Details) (USD $)
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0 Months Ended |
1 Months Ended |
12 Months Ended |
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Aug. 25, 2011
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Sep. 30, 2011
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Dec. 31, 2013
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Dec. 31, 2014
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Capital |
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Preferred stock, liquidation value (in dollars per share) |
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1,000.00us-gaap_PreferredStockLiquidationPreference |
$ 1,000.00us-gaap_PreferredStockLiquidationPreference |
Number of shares of common stock that can be purchased by exercise of warrants |
1,147,666us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |
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Percentage reduction in the number of shares of common stock that can be purchased by exercise of warrants |
50.00%buse_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRightsPercentageReduction |
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Number of shares of common stock that can be purchased by exercise of warrants, after reduction |
573,833buse_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRightsAfterReduction |
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Warrants outstanding (in shares) |
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573,833us-gaap_ClassOfWarrantOrRightOutstanding |
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Preferred stock, shares outstanding |
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72,664us-gaap_PreferredStockSharesOutstanding |
72,664us-gaap_PreferredStockSharesOutstanding |
Series C Preferred stock |
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Capital |
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Shares issued |
72,664us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
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Preferred stock, liquidation value (in dollars per share) |
1,000us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
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Aggregate proceeds from issuance of shares |
72,664,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
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Series C Preferred stock | Initial dividend period |
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Capital |
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Dividend rate (as a percent) |
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5.00%us-gaap_PreferredStockDividendRatePercentage / buse_DividendPeriodAxis = buse_DividendPeriodFrom25August2011To30September2011Member / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
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Series C Preferred stock | Period from the 2nd through the 10th calendar quarters |
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Capital |
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Dividend rate (as a percent) |
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5.00%us-gaap_PreferredStockDividendRatePercentage / buse_DividendPeriodAxis = buse_DividendPeriodFromSecondThroughTenthCalendarQuarterMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
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Series C Preferred stock | Period from the 11th calendar quarter through 4.5 years after issuance | Minimum |
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Capital |
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Dividend rate (as a percent) |
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1.00%us-gaap_PreferredStockDividendRatePercentage / buse_DividendPeriodAxis = buse_DividendPeriodFromEleventhCalendarQuarterThrough4.5YearsAfterIssuanceMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
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Series C Preferred stock | Period from the 11th calendar quarter through 4.5 years after issuance | Maximum |
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Capital |
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Dividend rate (as a percent) |
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7.00%us-gaap_PreferredStockDividendRatePercentage / buse_DividendPeriodAxis = buse_DividendPeriodFromEleventhCalendarQuarterThrough4.5YearsAfterIssuanceMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
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Series C Preferred stock | Period after 4.5 years from issuance |
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Capital |
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Dividend rate (as a percent) |
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9.00%us-gaap_PreferredStockDividendRatePercentage / buse_DividendPeriodAxis = buse_DividendPeriodAfter4.5YearsFromIssuanceMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
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Series T Preferred stock |
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Capital |
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Shares redeemed |
100,000us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = buse_SeriesTPreferredStockMember |
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Redemption price |
100,100,000us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = buse_SeriesTPreferredStockMember |
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