Name:	fbspra_DisposalGroupIncludingDiscontinuedOperationAccruedExpensesAndOtherLiabilities
Namespace Prefix:	fbspra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), the aggregate of amounts due from commercial, financial and agricultural segment for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Disposal Group Including Discontinued Operation Consumer and Installment Loans Receivable

No definition available.

Name:	fbspra_DisposalGroupIncludingDiscontinuedOperationConsumerandInstallmentLoansReceivable
Namespace Prefix:	fbspra_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The obligations arising from the interest bearing deposits demand (generally within one year) of a disposal group, including a component of the entity (discontinued operation).

No definition available.

Name:	fbspra_DisposalGroupIncludingDiscontinuedOperationInterestBearingDemand
Namespace Prefix:	fbspra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), the aggregate of net deferred loan fees for loans.

No definition available.

Name:	fbspra_DisposalGroupIncludingDiscontinuedOperationNetDeferredLoanFees
Namespace Prefix:	fbspra_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The obligations arising from the noninterest bearing deposits demand (generally within one year) of a disposal group, including a component of the entity (discontinued operation).

No definition available.

Name:	fbspra_DisposalGroupIncludingDiscontinuedOperationNoninterestBearingDemand
Namespace Prefix:	fbspra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The obligations arising from the other time deposits (generally within one year) of a disposal group, including a component of the entity (discontinued operation).

No definition available.

Name:	fbspra_DisposalGroupIncludingDiscontinuedOperationOtherTimeDeposits
Namespace Prefix:	fbspra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The obligations arising from the savings and money market (generally within one year) of a disposal group, including a component of the entity (discontinued operation).

No definition available.

Name:	fbspra_DisposalGroupIncludingDiscontinuedOperationSavingsAndMoneyMarket
Namespace Prefix:	fbspra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The obligations arising from the time deposits of $100 or more (generally within one year) of a disposal group, including a component of the entity (discontinued operation).

No definition available.

Name:	fbspra_DisposalGroupIncludingDiscontinuedOperationTimeDepositsOf100OrMore
Namespace Prefix:	fbspra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The obligations arising from the total deposits (generally within one year) of a disposal group, including a component of the entity (discontinued operation).

No definition available.

Name:	fbspra_DisposalGroupIncludingDiscontinuedOperationTotalDeposits
Namespace Prefix:	fbspra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	fbspra_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationDepositsAbstract
Namespace Prefix:	fbspra_
Data Type:	xbrli:stringItemType
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The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for assets of a disposal group, including a component of the entity (discontinued operation), to be sold or that has been disposed of through sale, as of the financial statement date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 46

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), the aggregate of amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 47

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), cash includes currency on hand as well as demand deposits with banks or financial institutions. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 47

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 7, 8, 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), carrying amount of goodwill (adjusted for any amortization recognized prior to adoption of FAS 142 and impairment charges).

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), carrying amount as of the balance sheet date of assets not otherwise specified.

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), carrying value (net of accumulated depreciation and any write-downs) of tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The obligations arising from the sale, disposal, or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation).