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DISCONTINUED OPERATIONS (Discontinued Operations Income Statement) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Jun. 30, 2013
Interest income:          
Interest and fees on loans   $ 1,221us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestIncome $ 1,762us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestIncome    
Interest expense:          
Interest on deposits   525us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense 1,449us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense    
Net interest income (loss)   696fbspra_DisposalGroupIncludingDiscontinuedOperationNetInterestIncomeLoss 313fbspra_DisposalGroupIncludingDiscontinuedOperationNetInterestIncomeLoss    
Provision for loan losses   0us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax 0us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax    
Net interest income (loss) after provision for loan losses   696fbspra_DisposalGroupIncludingDiscontinuedOperationNetInterestIncomeLossAfterProvisionForLoanLosses 313fbspra_DisposalGroupIncludingDiscontinuedOperationNetInterestIncomeLossAfterProvisionForLoanLosses    
Noninterest income:          
Service charges and client service fees   219fbspra_DisposalGroupIncludingDiscontinuedOperationServiceChargesAndCustomerServiceFees 586fbspra_DisposalGroupIncludingDiscontinuedOperationServiceChargesAndCustomerServiceFees    
Other   109us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome 122us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome    
Total noninterest income   328us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue 708us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue    
Noninterest expense:          
Salaries and employee benefits   3,930fbspra_DisposalGroupIncludingDiscontinuedOperationSalariesAndEmployeeBenefits 4,862fbspra_DisposalGroupIncludingDiscontinuedOperationSalariesAndEmployeeBenefits    
Occupancy, net of rental income   585fbspra_DisposalGroupIncludingDiscontinuedOperationOccupancyNetOfRentalIncome 1,772fbspra_DisposalGroupIncludingDiscontinuedOperationOccupancyNetOfRentalIncome    
Furniture and equipment   81fbspra_DisposalGroupIncludingDiscontinuedOperationFurnitureAndEquipment 367fbspra_DisposalGroupIncludingDiscontinuedOperationFurnitureAndEquipment    
Legal, examination and professional fees   68fbspra_DisposalGroupIncludingDiscontinuedOperationLegalExaminationAndProfessionalFees 67fbspra_DisposalGroupIncludingDiscontinuedOperationLegalExaminationAndProfessionalFees    
FDIC insurance   724fbspra_DisposalGroupIncludingDiscontinuedOperationFdicInsurance 1,481fbspra_DisposalGroupIncludingDiscontinuedOperationFdicInsurance    
Other   3,195us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense 1,293us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense    
Total noninterest expense   8,583us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense 9,842us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense    
Loss from operations of discontinued operations   (7,559)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax (8,821)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax    
Net gain on sale of discontinued operations   29,023us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax      
Provision (benefit) for income taxes   241us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation    
Net income (loss) from discontinued operations, net of tax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 21,223us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (8,821)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity    
Association Bank Services [Member]          
Interest income:          
Interest and fees on loans   1,221us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestIncome
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
1,762us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestIncome
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Interest expense:          
Interest on deposits   292us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
477us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Net interest income (loss)   929fbspra_DisposalGroupIncludingDiscontinuedOperationNetInterestIncomeLoss
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
1,285fbspra_DisposalGroupIncludingDiscontinuedOperationNetInterestIncomeLoss
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Provision for loan losses   0us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
0us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Net interest income (loss) after provision for loan losses   929fbspra_DisposalGroupIncludingDiscontinuedOperationNetInterestIncomeLossAfterProvisionForLoanLosses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
1,285fbspra_DisposalGroupIncludingDiscontinuedOperationNetInterestIncomeLossAfterProvisionForLoanLosses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Noninterest income:          
Service charges and client service fees   85fbspra_DisposalGroupIncludingDiscontinuedOperationServiceChargesAndCustomerServiceFees
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
119fbspra_DisposalGroupIncludingDiscontinuedOperationServiceChargesAndCustomerServiceFees
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Other   105us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
109us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Total noninterest income   190us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
228us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Noninterest expense:          
Salaries and employee benefits   3,045fbspra_DisposalGroupIncludingDiscontinuedOperationSalariesAndEmployeeBenefits
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
2,583fbspra_DisposalGroupIncludingDiscontinuedOperationSalariesAndEmployeeBenefits
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Occupancy, net of rental income   6fbspra_DisposalGroupIncludingDiscontinuedOperationOccupancyNetOfRentalIncome
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
12fbspra_DisposalGroupIncludingDiscontinuedOperationOccupancyNetOfRentalIncome
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Furniture and equipment   41fbspra_DisposalGroupIncludingDiscontinuedOperationFurnitureAndEquipment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
89fbspra_DisposalGroupIncludingDiscontinuedOperationFurnitureAndEquipment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Legal, examination and professional fees   68fbspra_DisposalGroupIncludingDiscontinuedOperationLegalExaminationAndProfessionalFees
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
62fbspra_DisposalGroupIncludingDiscontinuedOperationLegalExaminationAndProfessionalFees
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
FDIC insurance   671fbspra_DisposalGroupIncludingDiscontinuedOperationFdicInsurance
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
1,123fbspra_DisposalGroupIncludingDiscontinuedOperationFdicInsurance
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Other   743us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
942us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Total noninterest expense   4,574us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
4,811us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Loss from operations of discontinued operations   (3,455)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
(3,298)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Net gain on sale of discontinued operations   28,615us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
  28,615us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
 
Provision (benefit) for income taxes   241us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Net income (loss) from discontinued operations, net of tax   24,919us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
(3,298)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_AssociationBankServicesMember
   
Northern Florida Region [Member]          
Interest income:          
Interest and fees on loans   0us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestIncome
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
0us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestIncome
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Interest expense:          
Interest on deposits   233us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
972us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Net interest income (loss)   (233)fbspra_DisposalGroupIncludingDiscontinuedOperationNetInterestIncomeLoss
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
(972)fbspra_DisposalGroupIncludingDiscontinuedOperationNetInterestIncomeLoss
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Provision for loan losses   0us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
0us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Net interest income (loss) after provision for loan losses   (233)fbspra_DisposalGroupIncludingDiscontinuedOperationNetInterestIncomeLossAfterProvisionForLoanLosses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
(972)fbspra_DisposalGroupIncludingDiscontinuedOperationNetInterestIncomeLossAfterProvisionForLoanLosses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Noninterest income:          
Service charges and client service fees   134fbspra_DisposalGroupIncludingDiscontinuedOperationServiceChargesAndCustomerServiceFees
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
467fbspra_DisposalGroupIncludingDiscontinuedOperationServiceChargesAndCustomerServiceFees
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Other   4us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
13us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Total noninterest income   138us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
480us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Noninterest expense:          
Salaries and employee benefits   885fbspra_DisposalGroupIncludingDiscontinuedOperationSalariesAndEmployeeBenefits
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
2,279fbspra_DisposalGroupIncludingDiscontinuedOperationSalariesAndEmployeeBenefits
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Occupancy, net of rental income   579fbspra_DisposalGroupIncludingDiscontinuedOperationOccupancyNetOfRentalIncome
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
1,760fbspra_DisposalGroupIncludingDiscontinuedOperationOccupancyNetOfRentalIncome
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Furniture and equipment   40fbspra_DisposalGroupIncludingDiscontinuedOperationFurnitureAndEquipment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
278fbspra_DisposalGroupIncludingDiscontinuedOperationFurnitureAndEquipment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Legal, examination and professional fees   0fbspra_DisposalGroupIncludingDiscontinuedOperationLegalExaminationAndProfessionalFees
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
5fbspra_DisposalGroupIncludingDiscontinuedOperationLegalExaminationAndProfessionalFees
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
FDIC insurance   53fbspra_DisposalGroupIncludingDiscontinuedOperationFdicInsurance
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
358fbspra_DisposalGroupIncludingDiscontinuedOperationFdicInsurance
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Other   2,452us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
351us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Total noninterest expense   4,009us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
5,031us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Loss from operations of discontinued operations   (4,104)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
(5,523)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Net gain on sale of discontinued operations   408us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
    408us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
Provision (benefit) for income taxes   0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
   
Net income (loss) from discontinued operations, net of tax   $ (3,696)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember
$ (5,523)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= fbspra_NorthernFloridaRegionMember