Note 1 - Summary of Significant Accounting Policies (Details)	Dec. 31, 2014
Accounting Policies [Abstract]
Number of Wholly-owned Trusts	1

Number of wholly-owned trusts held by the entity formed to issue trust preferred securities and related common securities.

No definition available.

Name:	boch_NumberOfWhollyOwnedTrusts
Namespace Prefix:	boch_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant