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Note 18 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Estimate of Fair Value Measurement [Member]    
Note 18 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]    
Impaired loans $ 6,542bsf_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 $ 16,264bsf_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
REO, net 3,844bsf_OtherRealEstateOwnedNetFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 5,895bsf_OtherRealEstateOwnedNetFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Inputs, Level 3 [Member]    
Note 18 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]    
Impaired loans 6,542bsf_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 16,264bsf_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
REO, net $ 3,844bsf_OtherRealEstateOwnedNetFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 5,895bsf_OtherRealEstateOwnedNetFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member