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