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Note 12 - Other Borrowings (Details) - Maturities of Other Borrowings (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Maturities of Other Borrowings [Abstract]    
2015 0.44%bsf_OtherBorrowingsMaturitiesSummaryAverageInterestRateWithinOneYearFromBalanceSheetDate  
2015 $ 19,349us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2016 0.56%bsf_OtherBorrowingsMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate  
2016 14,812us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 2.31%bsf_OtherBorrowingsMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate  
2017 1,490us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 2.11%bsf_OtherBorrowingsMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate  
2018 6,416us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2019 1.99%bsf_OtherBorrowingsMaturitiesSummaryAverageInterestRateFourToFiveYearsFromBalanceSheetDate  
2019 12,119us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
2020 and thereafter 2.68%bsf_OtherBorrowingsMaturitiesSummaryAverageInterestRateOverFiveYearsFromBalanceSheetDate  
2020 and thereafter 7,072us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Total 1.26%us-gaap_DebtWeightedAverageInterestRate  
Total $ 61,258us-gaap_OtherBorrowings $ 5,941us-gaap_OtherBorrowings