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LOANS AND ALLOWANCE FOR LOAN LOSSES (Textual) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans and leases receivable, gross, consumer, real estate, required interest only payments $ 12,700,000fbspra_LoansAndLeasesReceivableGrossConsumerRealEstateRequiredInterestOnlyPayments $ 16,000,000fbspra_LoansAndLeasesReceivableGrossConsumerRealEstateRequiredInterestOnlyPayments  
Delinquency percent, residential real estate mortgages that require interest only payments as a percentage of total residential real estate mortgages that require interest only payments 5.10%fbspra_DelinquencyPercentResidentialRealEstateMortgagesThatRequireInterestOnlyPaymentsAsPercentageOfTotalResidentialRealEstateMortgagesThatRequireInterestOnlyPayments 5.10%fbspra_DelinquencyPercentResidentialRealEstateMortgagesThatRequireInterestOnlyPaymentsAsPercentageOfTotalResidentialRealEstateMortgagesThatRequireInterestOnlyPayments  
Percent of total loan portfolio collateralized 98.00%fbspra_PercentOfTotalLoanPortfolioCollateralized 99.00%fbspra_PercentOfTotalLoanPortfolioCollateralized  
Loans pledged as collateral 1,050,000,000us-gaap_LoansPledgedAsCollateral 1,030,000,000us-gaap_LoansPledgedAsCollateral  
Impaired financing receivable individually evaluated for impairment 37,541,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment 57,005,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment  
Interest on impaired loans that would have been recorded under the original terms of the loans 11,900,000us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans 13,400,000us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans 21,700,000us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans
Interest income recognized/received on impaired loans 3,600,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod 4,300,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod 6,000,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Allowance allocated to troubled debt restructurings 12,471,000us-gaap_ImpairedFinancingReceivableRelatedAllowance 15,431,000us-gaap_ImpairedFinancingReceivableRelatedAllowance  
Minimum [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Impaired financing receivable individually evaluated for impairment 500,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Real estate construction and development [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total real estate loans as a percentage of total loan portfolio 77.00%fbspra_TotalRealEstateLoansAsPercentageOfTotalLoanPortfolio
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_RealEstateConstructionAndDevelopmentMember
78.00%fbspra_TotalRealEstateLoansAsPercentageOfTotalLoanPortfolio
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_RealEstateConstructionAndDevelopmentMember
 
Impaired financing receivable individually evaluated for impairment 2,626,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_RealEstateConstructionAndDevelopmentMember
3,440,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_RealEstateConstructionAndDevelopmentMember
 
Allowance allocated to troubled debt restructurings 219,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_RealEstateConstructionAndDevelopmentMember
294,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_RealEstateConstructionAndDevelopmentMember
 
Residential Real Estate Mortgages, Home Equity Lines of Credit [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Residential real estate mortgages and home equity lines of credit as a percentage of total real estate loans 43.00%fbspra_ResidentialRealEstateMortgagesAndHomeEquityLinesOfCreditAsPercentageOfTotalRealEstateLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_ResidentialRealEstateMortgagesHomeEquityLinesOfCreditMember
42.00%fbspra_ResidentialRealEstateMortgagesAndHomeEquityLinesOfCreditAsPercentageOfTotalRealEstateLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_ResidentialRealEstateMortgagesHomeEquityLinesOfCreditMember
 
Impaired Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing receivable, allowance for credit losses, accumulated write-downs 55,000,000fbspra_FinancingReceivableAllowanceForCreditLossesAccumulatedWriteDowns
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_ImpairedLoansMember
54,900,000fbspra_FinancingReceivableAllowanceForCreditLossesAccumulatedWriteDowns
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_ImpairedLoansMember
 
Hamp Program [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Troubled debt restructurings under HAMP program 72,700,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_HampProgramMember
75,300,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbspra_HampProgramMember
 
Troubled Debt Restructurings [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance allocated to troubled debt restructurings 6,100,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbspra_TroubledDebtRestructuringsMember
9,100,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbspra_TroubledDebtRestructuringsMember
 
Directors Affliates and Executive Officers [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans and leases receivable, related parties $ 28,800,000us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fbspra_DirectorsAffliatesAndExecutiveOfficersMember
$ 12,000,000us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fbspra_DirectorsAffliatesAndExecutiveOfficersMember