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LOANS AND ALLOWANCE FOR LOAN LOSSES (Modified Troubled Debt Restructurings That Subsequently Defaulted) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
contracts
Dec. 31, 2013
contracts
Commercial, financial and agricultural [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_CommercialFinancialAndAgriculturalMember
3us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_CommercialFinancialAndAgriculturalMember
Recorded Investment, Subsequently Defaulted $ 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_CommercialFinancialAndAgriculturalMember
$ 401us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_CommercialFinancialAndAgriculturalMember
One-to-four-family residential [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 8us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
6us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
Recorded Investment, Subsequently Defaulted $ 1,385us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
$ 1,101us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember