STOCK IN FINANCIAL INSTITUTIONS (Detail Textuals) - USD ($)	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock in Financial Institutions [Abstract]
Stock in financial institutions	$ 1,552,961	$ 1,546,847	$ 1,905,935

Represents the aggregate amount deposited in financial institutions other than Banks.

No definition available.

Name:	bctf_StockWithFinancialInstitution
Namespace Prefix:	bctf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant