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LOANS AND ALLOWANCE FOR LOAN LOSSES (Modified Troubled Debt Restructurings) (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 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_CommercialFinancialAndAgriculturalMember
2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_CommercialFinancialAndAgriculturalMember
Pre-Modification Outstanding Recorded Investment $ 287us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_CommercialFinancialAndAgriculturalMember
$ 246us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_CommercialFinancialAndAgriculturalMember
Post-Modification Outstanding Recorded Investment 287us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_CommercialFinancialAndAgriculturalMember
201us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_CommercialFinancialAndAgriculturalMember
One-to-four-family residential [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 52us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
53us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
Pre-Modification Outstanding Recorded Investment 7,187us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
11,838us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
Post-Modification Outstanding Recorded Investment $ 6,338us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
$ 10,897us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember