CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS (Additional Information) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Capital Requirement and Restrictions On Retained Earnings [Line Items]
Limit Of Payment Without Regulatory Approval	$ 27,917

Limit on the amount of dividend payment without regulatory approval as on the date.

No definition available.

Name:	bkyf_LimitOfPaymentWithoutRegulatoryApproval
Namespace Prefix:	bkyf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant