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Parent Company Only Financial Information (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
ASSETS        
Cash and due from subsidiary banks $ 339,438us-gaap_CashAndDueFromBanks $ 231,603us-gaap_CashAndDueFromBanks    
Securities available for sale 759,065us-gaap_AvailableForSaleSecurities 841,310us-gaap_AvailableForSaleSecurities    
Investments in subsidiaries:        
Premises and equipment, net 63,974us-gaap_PropertyPlantAndEquipmentNet 65,827us-gaap_PropertyPlantAndEquipmentNet    
Other assets 41,288us-gaap_OtherAssets 43,562us-gaap_OtherAssets    
Total assets 3,665,607us-gaap_Assets 3,539,575us-gaap_Assets    
Liabilities:        
Junior subordinated debentures owed to unconsolidated Trusts 55,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust 55,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust    
Other liabilities 27,227us-gaap_OtherLiabilities 27,725us-gaap_OtherLiabilities    
Total liabilities 3,231,968us-gaap_Liabilities 3,124,211us-gaap_Liabilities    
Total stockholders' equity 433,639us-gaap_StockholdersEquity 415,364us-gaap_StockholdersEquity 408,797us-gaap_StockholdersEquity 409,267us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 3,665,607us-gaap_LiabilitiesAndStockholdersEquity 3,539,575us-gaap_LiabilitiesAndStockholdersEquity    
Parent        
ASSETS        
Cash and due from subsidiary banks 84,537us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
42,645us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Securities available for sale 201us-gaap_AvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
201us-gaap_AvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investments in subsidiaries:        
Bank 373,773buse_InvestmentsInBankingSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
400,442buse_InvestmentsInBankingSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Non-bank 28,348buse_InvestmentsInNonBankingSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
25,646buse_InvestmentsInNonBankingSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Premises and equipment, net 523us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
521us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other assets 8,684us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
9,450us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total assets 496,066us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
478,905us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Liabilities:        
Junior subordinated debentures owed to unconsolidated Trusts 55,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
55,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other liabilities 7,427us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8,541us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities 62,427us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
63,541us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total stockholders' equity 433,639us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
415,364us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities and stockholders' equity $ 496,066us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 478,905us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember