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Loans (Details 4) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
item
Loans      
Unpaid Contractual Principal Balance $ 32,142,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance $ 30,124,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance  
Recorded Investment with No Allowance 23,797,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment 21,289,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment  
Recorded Investment with Allowance 4,093,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment 5,297,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment  
Total Recorded Investment 27,890,000us-gaap_ImpairedFinancingReceivableRecordedInvestment 26,586,000us-gaap_ImpairedFinancingReceivableRecordedInvestment  
Related Allowance 2,273,000us-gaap_ImpairedFinancingReceivableRelatedAllowance 3,168,000us-gaap_ImpairedFinancingReceivableRelatedAllowance  
Average Recorded Investment 27,431,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment 28,668,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment  
Illinois/Indiana      
Loans      
Unpaid Contractual Principal Balance 13,512,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
9,799,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Recorded Investment with No Allowance 8,137,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
4,927,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Recorded Investment with Allowance 2,825,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
3,666,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Total Recorded Investment 10,962,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
8,593,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Related Allowance 1,909,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
2,641,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Average Recorded Investment 11,707,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
13,284,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Florida      
Loans      
Unpaid Contractual Principal Balance 18,630,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_StatementGeographicalAxis
= stpr_FL
20,325,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Recorded Investment with No Allowance 15,660,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= stpr_FL
16,362,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Recorded Investment with Allowance 1,268,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= stpr_FL
1,631,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Total Recorded Investment 16,928,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= stpr_FL
17,993,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Related Allowance 364,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_StatementGeographicalAxis
= stpr_FL
527,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Average Recorded Investment 15,724,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= stpr_FL
15,384,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
In compliance with modified terms      
Loans      
Number of contracts     1buse_FinancingReceivableModificationsMadeNumberOfContracts
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Commercial | Illinois/Indiana      
Loans      
Unpaid Contractual Principal Balance 2,874,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
2,944,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Recorded Investment with No Allowance 1,410,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
1,376,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Recorded Investment with Allowance 637,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
741,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Total Recorded Investment 2,047,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
2,117,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Related Allowance 546,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
595,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Average Recorded Investment 2,430,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
2,479,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Commercial | Florida      
Loans      
Unpaid Contractual Principal Balance 2,050,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
2,742,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Recorded Investment with No Allowance 950,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
1,642,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Total Recorded Investment 950,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
1,642,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Average Recorded Investment 520,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
330,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Commercial | Included in non-performing loans | Florida      
Loans      
Number of contracts 1buse_FinancingReceivableModificationsDefaultedInCurrentPeriodNumberOfContracts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
   
Recorded Investment 1,000,000buse_FinancingReceivableModificationsDefaultedInCurrentPeriodRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
   
Commercial real estate | Illinois/Indiana      
Loans      
Unpaid Contractual Principal Balance 5,460,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
4,007,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Recorded Investment with No Allowance 2,510,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
1,140,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Recorded Investment with Allowance 2,122,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
2,854,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Total Recorded Investment 4,632,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
3,994,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Related Allowance 1,297,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
1,975,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Average Recorded Investment 4,917,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
5,473,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Commercial real estate | Florida      
Loans      
Unpaid Contractual Principal Balance 5,753,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
5,775,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Recorded Investment with No Allowance 4,406,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
4,414,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Recorded Investment with Allowance 1,261,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
1,274,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Total Recorded Investment 5,667,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
5,688,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Related Allowance 357,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
370,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Average Recorded Investment 5,112,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
5,032,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Real estate construction | Illinois/Indiana      
Loans      
Unpaid Contractual Principal Balance 636,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
46,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Recorded Investment with No Allowance 340,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
   
Recorded Investment with Allowance 41,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
46,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Total Recorded Investment 381,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
46,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Related Allowance 41,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
46,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Average Recorded Investment 1,573,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
2,269,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Real estate construction | Florida      
Loans      
Unpaid Contractual Principal Balance 606,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
620,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Recorded Investment with No Allowance 537,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
551,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Total Recorded Investment 537,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
551,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Average Recorded Investment 509,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
485,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RealEstateConstructionMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Retail real estate | Illinois/Indiana      
Loans      
Unpaid Contractual Principal Balance 4,017,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
2,794,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Recorded Investment with No Allowance 3,419,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
2,403,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Recorded Investment with Allowance 25,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
25,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Total Recorded Investment 3,444,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
2,428,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Related Allowance 25,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
25,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Average Recorded Investment 2,694,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
3,061,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Retail real estate | Florida      
Loans      
Unpaid Contractual Principal Balance 10,214,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
11,181,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Recorded Investment with No Allowance 9,767,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
9,755,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Recorded Investment with Allowance   350,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Total Recorded Investment 9,767,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
10,105,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Related Allowance   150,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Average Recorded Investment 9,577,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
9,532,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Retail real estate | In compliance with modified terms | Illinois/Indiana      
Loans      
Number of contracts 2buse_FinancingReceivableModificationsMadeNumberOfContracts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
   
Recorded Investment 100,000buse_FinancingReceivableModificationsMadeRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
   
Retail real estate | In compliance with modified terms | Florida      
Loans      
Number of contracts 2buse_FinancingReceivableModificationsMadeNumberOfContracts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
   
Recorded Investment 300,000buse_FinancingReceivableModificationsMadeRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
   
Retail other | Illinois/Indiana      
Loans      
Unpaid Contractual Principal Balance 525,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
8,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Recorded Investment with No Allowance 458,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
8,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Total Recorded Investment 458,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
8,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Average Recorded Investment 93,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
2,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= buse_IndianaOrIllinoisMember
 
Retail other | Florida      
Loans      
Unpaid Contractual Principal Balance 7,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
7,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Recorded Investment with Allowance 7,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
7,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Total Recorded Investment 7,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
7,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Related Allowance 7,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
7,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
 
Average Recorded Investment $ 6,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL
$ 5,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= buse_RetailOtherMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL