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LOANS AND ALLOWANCE FOR LOAN LOSSES (Modified Troubled Debt Restructurings) (Details) (One-to-four-family residential [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
contracts
Mar. 31, 2014
contracts
One-to-four-family residential [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Contracts 6us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
15us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
Pre-Modification Outstanding Recorded Investment $ 1,723us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
$ 2,580us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
Post-Modification Outstanding Recorded Investment $ 1,640us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
$ 2,157us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember