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Note 21 - Regulatory Matters (Details) - The Bank’s Actual and Required Capital Amounts (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2014
Tangible Capital to Tangible Assets    
First Federal $ 70,853us-gaap_TangibleCapital  
First Federal 12.90%us-gaap_TangibleCapitalToTangibleAssets  
First Federal 8,240us-gaap_TangibleCapitalRequiredForCapitalAdequacy  
First Federal 1.50%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets  
First Federal     
First Federal     
Tier 1 Capital to Average Assets    
Tier 1 capital to adjusted tangible assets, actual amount 70,853us-gaap_TierOneLeverageCapital  
Tier 1 capital to adjusted tangible assets, actual ratio 12.90%us-gaap_TierOneLeverageCapitalToAverageAssets  
Tier 1 capital to adjusted tangible assets, amount for capital adequacy purposes 21,972us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy  
Tier 1 capital to adjusted tangible assets, ratio for capital adequacy purposes 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets  
Tier 1 capital to adjusted tangible assets, amount to be categorized as well capitalized 27,465us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized  
Tier 1 capital to adjusted tangible assets, to be categorized as well capitalized 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets  
Total Capital to Risk-Weighted Assets    
Total capital to risk-weighted assets, actual amount 76,036us-gaap_Capital  
Total capital to risk-weighted assets, actual ratio 18.68%us-gaap_CapitalToRiskWeightedAssets  
Total capital to risk-weighted assets, amount for capital adequacy purposes 32,570us-gaap_CapitalRequiredForCapitalAdequacy  
Total capital to risk-weighted assets, ratio for capital adequacy purposes 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets  
Total capital to risk-weighted assets, amount to be categorized as well capitalized 40,713us-gaap_CapitalRequiredToBeWellCapitalized  
Total capital to risk-weighted assets, ratio to be categorized as well capitalized 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets  
Tier I Capital to Risk-Weighted Assets    
Tier i capital to risk-weighted assets, actual amount 70,853us-gaap_TierOneRiskBasedCapital  
Tier i capital to risk-weighted assets, actual ratio 17.40%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets  
Tier i capital to risk-weighted assets, amount for capital adequacy purposes     
Tier i capital to risk-weighted assets, ratio for capital adequacy purposes     
Tier i capital to risk-weighted assets, amount to be categorized as well capitalized 24,428us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized  
Tier i capital to risk-weighted assets, ratio to be categorized as well capitalized 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets  
First Federal Bank [Member]    
Tangible Capital to Tangible Assets    
First Federal   54,215us-gaap_TangibleCapital
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
First Federal   9.21%us-gaap_TangibleCapitalToTangibleAssets
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
First Federal   8,825us-gaap_TangibleCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
First Federal   1.50%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
First Federal     
First Federal     
Tier 1 Capital to Average Assets    
Tier 1 capital to adjusted tangible assets, actual amount   54,215us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
[1]
Tier 1 capital to adjusted tangible assets, actual ratio   9.21%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
[1]
Tier 1 capital to adjusted tangible assets, amount for capital adequacy purposes   23,534us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
[1]
Tier 1 capital to adjusted tangible assets, ratio for capital adequacy purposes   4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
[1]
Tier 1 capital to adjusted tangible assets, amount to be categorized as well capitalized   29,417us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
[1]
Tier 1 capital to adjusted tangible assets, to be categorized as well capitalized   5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
[1]
Total Capital to Risk-Weighted Assets    
Total capital to risk-weighted assets, actual amount   60,226us-gaap_Capital
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
Total capital to risk-weighted assets, actual ratio   12.68%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
Total capital to risk-weighted assets, amount for capital adequacy purposes   37,984us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
Total capital to risk-weighted assets, ratio for capital adequacy purposes   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
Total capital to risk-weighted assets, amount to be categorized as well capitalized   47,480us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
Total capital to risk-weighted assets, ratio to be categorized as well capitalized   10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
Tier I Capital to Risk-Weighted Assets    
Tier i capital to risk-weighted assets, actual amount   54,215us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
Tier i capital to risk-weighted assets, actual ratio   11.42%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
Tier i capital to risk-weighted assets, amount for capital adequacy purposes     
Tier i capital to risk-weighted assets, ratio for capital adequacy purposes     
Tier i capital to risk-weighted assets, amount to be categorized as well capitalized   28,488us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
Tier i capital to risk-weighted assets, ratio to be categorized as well capitalized   6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_FirstFederalBankMember
Consolidated Entities [Member]    
Tier 1 Capital to Average Assets    
Tier 1 capital to adjusted tangible assets, actual amount   122,537us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier 1 capital to adjusted tangible assets, actual ratio   8.29%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier 1 capital to adjusted tangible assets, amount for capital adequacy purposes   59,146us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier 1 capital to adjusted tangible assets, ratio for capital adequacy purposes   4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier 1 capital to adjusted tangible assets, amount to be categorized as well capitalized     
Tier 1 capital to adjusted tangible assets, to be categorized as well capitalized     
Total Capital to Risk-Weighted Assets    
Total capital to risk-weighted assets, actual amount   136,197us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Total capital to risk-weighted assets, actual ratio   12.11%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Total capital to risk-weighted assets, amount for capital adequacy purposes   90,002us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Total capital to risk-weighted assets, ratio for capital adequacy purposes   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Total capital to risk-weighted assets, amount to be categorized as well capitalized     
Total capital to risk-weighted assets, ratio to be categorized as well capitalized     
Tier I Capital to Risk-Weighted Assets    
Tier i capital to risk-weighted assets, actual amount   122,537us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier i capital to risk-weighted assets, actual ratio   10.89%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier i capital to risk-weighted assets, amount for capital adequacy purposes   45,001us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier i capital to risk-weighted assets, ratio for capital adequacy purposes   4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier i capital to risk-weighted assets, amount to be categorized as well capitalized     
Tier i capital to risk-weighted assets, ratio to be categorized as well capitalized     
First National Bank [Member]    
Tier 1 Capital to Average Assets    
Tier 1 capital to adjusted tangible assets, actual amount   56,245us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Tier 1 capital to adjusted tangible assets, actual ratio   9.40%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Tier 1 capital to adjusted tangible assets, amount for capital adequacy purposes   17,951us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Tier 1 capital to adjusted tangible assets, ratio for capital adequacy purposes   3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Tier 1 capital to adjusted tangible assets, amount to be categorized as well capitalized   29,919us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Tier 1 capital to adjusted tangible assets, to be categorized as well capitalized   5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Total Capital to Risk-Weighted Assets    
Total capital to risk-weighted assets, actual amount   57,100us-gaap_Capital
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Total capital to risk-weighted assets, actual ratio   13.34%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Total capital to risk-weighted assets, amount for capital adequacy purposes   34,234us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Total capital to risk-weighted assets, ratio for capital adequacy purposes   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Total capital to risk-weighted assets, amount to be categorized as well capitalized   42,792us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Total capital to risk-weighted assets, ratio to be categorized as well capitalized   10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Tier I Capital to Risk-Weighted Assets    
Tier i capital to risk-weighted assets, actual amount   56,245us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Tier i capital to risk-weighted assets, actual ratio   13.14%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Tier i capital to risk-weighted assets, amount for capital adequacy purposes   17,117us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Tier i capital to risk-weighted assets, ratio for capital adequacy purposes   4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Tier i capital to risk-weighted assets, amount to be categorized as well capitalized   25,675us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Tier i capital to risk-weighted assets, ratio to be categorized as well capitalized   6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_FirstNationalBankMember
Heritage Bank [Member]    
Tier 1 Capital to Average Assets    
Tier 1 capital to adjusted tangible assets, actual amount   29,086us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Tier 1 capital to adjusted tangible assets, actual ratio   9.76%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Tier 1 capital to adjusted tangible assets, amount for capital adequacy purposes   11,925us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Tier 1 capital to adjusted tangible assets, ratio for capital adequacy purposes   4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Tier 1 capital to adjusted tangible assets, amount to be categorized as well capitalized   14,906us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Tier 1 capital to adjusted tangible assets, to be categorized as well capitalized   5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Total Capital to Risk-Weighted Assets    
Total capital to risk-weighted assets, actual amount   29,786us-gaap_Capital
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Total capital to risk-weighted assets, actual ratio   13.67%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Total capital to risk-weighted assets, amount for capital adequacy purposes   17,432us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Total capital to risk-weighted assets, ratio for capital adequacy purposes   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Total capital to risk-weighted assets, amount to be categorized as well capitalized   21,790us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Total capital to risk-weighted assets, ratio to be categorized as well capitalized   10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Tier I Capital to Risk-Weighted Assets    
Tier i capital to risk-weighted assets, actual amount   29,086us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Tier i capital to risk-weighted assets, actual ratio   13.35%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Tier i capital to risk-weighted assets, amount for capital adequacy purposes   8,716us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Tier i capital to risk-weighted assets, ratio for capital adequacy purposes   4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Tier i capital to risk-weighted assets, amount to be categorized as well capitalized   $ 13,074us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
Tier i capital to risk-weighted assets, ratio to be categorized as well capitalized   6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= bsf_HeritageBankMember
[1] In the case of First Federal, the ratio is calculated based on adjusted assets at period end.