STOCK IN FINANCIAL INSTITUTIONS (Details Textual) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Stock With Financial Institution	$ 3,575,061	$ 1,546,847

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