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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loan Portfolio Composition) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial, financial and agricultural $ 700,183us-gaap_LoansReceivableCommercialFinancialAndAgricultural $ 695,267us-gaap_LoansReceivableCommercialFinancialAndAgricultural
Real estate construction and development 110,705us-gaap_LoansReceivableCommercialDevelopment 89,851us-gaap_LoansReceivableCommercialDevelopment
Real estate mortgage:    
Real estate mortgage 2,319,175us-gaap_LoansReceivableCommercialMortgage 2,315,186us-gaap_LoansReceivableCommercialMortgage
Consumer and installment 20,956us-gaap_LoansAndLeasesReceivableConsumerInstallmentAndRevolving 18,950us-gaap_LoansAndLeasesReceivableConsumerInstallmentAndRevolving
Net deferred loan fees (1,277)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums (1,422)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums
Total loans held for portfolio 3,149,742us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 3,117,832us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Loans held for sale 43,655us-gaap_LoansHeldForSaleMortgages 31,411us-gaap_LoansHeldForSaleMortgages
Total loans 3,193,397fbspra_LoansAndLeasesReceivableNetOfDeferredIncomeIncludingLoansHeldForSale 3,149,243fbspra_LoansAndLeasesReceivableNetOfDeferredIncomeIncludingLoansHeldForSale
One-to-four-family residential [Member]    
Real estate mortgage:    
Real estate mortgage 1,030,088us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
1,016,710us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
Total loans held for portfolio 1,030,088us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
1,016,710us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_OneToFourFamilyResidentialMember
Multi-family residential [Member]    
Real estate mortgage:    
Real estate mortgage 114,288us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_MultiFamilyResidentialMember
115,434us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_MultiFamilyResidentialMember
Total loans held for portfolio 114,288us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_MultiFamilyResidentialMember
115,434us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_MultiFamilyResidentialMember
Total loans 114,288fbspra_LoansAndLeasesReceivableNetOfDeferredIncomeIncludingLoansHeldForSale
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_MultiFamilyResidentialMember
115,434fbspra_LoansAndLeasesReceivableNetOfDeferredIncomeIncludingLoansHeldForSale
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_MultiFamilyResidentialMember
Commercial real estate [Member]    
Real estate mortgage:    
Real estate mortgage 1,174,799us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
1,183,042us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Total loans held for portfolio 1,174,799us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
1,183,042us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Total loans $ 1,174,799fbspra_LoansAndLeasesReceivableNetOfDeferredIncomeIncludingLoansHeldForSale
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
$ 1,183,042fbspra_LoansAndLeasesReceivableNetOfDeferredIncomeIncludingLoansHeldForSale
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember