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Note 8 - Goodwill and Core Deposit Intangible - Net (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Note 8 - Goodwill and Core Deposit Intangible - Net (Details) [Line Items]    
Goodwill 25,717,000us-gaap_Goodwill $ 25,717,000us-gaap_Goodwill
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 469,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 625,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 625,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 625,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 625,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 4,200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Core Deposits [Member] | Minimum [Member]    
Note 8 - Goodwill and Core Deposit Intangible - Net (Details) [Line Items]    
Finite-Lived Intangible Asset, Useful Life 12 years  
Core Deposits [Member] | Maximum [Member]    
Note 8 - Goodwill and Core Deposit Intangible - Net (Details) [Line Items]    
Finite-Lived Intangible Asset, Useful Life 13 years  
First National Security Company [Member]    
Note 8 - Goodwill and Core Deposit Intangible - Net (Details) [Line Items]    
Goodwill 25,700,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= bsf_FirstNationalSecurityCompanyMember