No definition available.

Name:	btoc_CreditCardRebateIncome
Namespace Prefix:	btoc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represent the amount of gain on lease settlement and modification.

No definition available.

Name:	btoc_GainOnLeaseSettlementAndModification
Namespace Prefix:	btoc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Rental expense.

No definition available.

Name:	btoc_RentalExpense
Namespace Prefix:	btoc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of interest income earned from interest bearing assets classified as other.

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Name:	us-gaap_InterestIncomeOther
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Data Type:	xbrli:monetaryItemType
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Amount of revenue and income classified as other.

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-Topic 944
-SubTopic 220
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-Subparagraph (SX 210.7-04(4))
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of income related to nonoperating activities, classified as other.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

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

Income earned by providing the use of assets to an outside party in exchange for a payment or series of payments that is nonoperating in nature.

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