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Note 23 - Branch Sales (Details) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Jun. 21, 2013
Sep. 27, 2013
Note 23 - Branch Sales (Details) [Line Items]      
Loans and Leases Receivable, Commitments to Purchase or Sell $ 14,700,000us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell    
Associated with Overdrawn Deposit Accounts [Member] | The First National Banking Green Forest [Member]      
Note 23 - Branch Sales (Details) [Line Items]      
Loans Receivable, Net   6,000us-gaap_LoansReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bsf_AssociatedWithOverdrawnDepositAccountsMember
/ us-gaap_CounterpartyNameAxis
= bsf_TheFirstNationalBankingGreenForestMember
 
The First National Banking Green Forest [Member]      
Note 23 - Branch Sales (Details) [Line Items]      
Deposits Held for Sale   17,800,000bsf_DepositsHeldForSale
/ us-gaap_CounterpartyNameAxis
= bsf_TheFirstNationalBankingGreenForestMember
 
Deposit Liabilities, Accrued Interest   20,000us-gaap_DepositLiabilitiesAccruedInterest
/ us-gaap_CounterpartyNameAxis
= bsf_TheFirstNationalBankingGreenForestMember
 
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment   216,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment
/ us-gaap_CounterpartyNameAxis
= bsf_TheFirstNationalBankingGreenForestMember
 
Loans and Leases Receivable, Commitments to Purchase or Sell   3,300,000us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell
/ us-gaap_CounterpartyNameAxis
= bsf_TheFirstNationalBankingGreenForestMember
 
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds   14,200,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
/ us-gaap_CounterpartyNameAxis
= bsf_TheFirstNationalBankingGreenForestMember
 
Gain (Loss) on Disposition of Assets   0us-gaap_GainLossOnDispositionOfAssets1
/ us-gaap_CounterpartyNameAxis
= bsf_TheFirstNationalBankingGreenForestMember
 
First Security Bank [Member]      
Note 23 - Branch Sales (Details) [Line Items]      
Deposits Held for Sale     3,900,000bsf_DepositsHeldForSale
/ us-gaap_CounterpartyNameAxis
= bsf_FirstSecurityBankMember
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment     1,500,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment
/ us-gaap_CounterpartyNameAxis
= bsf_FirstSecurityBankMember
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds     2,200,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
/ us-gaap_CounterpartyNameAxis
= bsf_FirstSecurityBankMember
Gain (Loss) on Disposition of Assets     $ 77,000us-gaap_GainLossOnDispositionOfAssets1
/ us-gaap_CounterpartyNameAxis
= bsf_FirstSecurityBankMember