CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY [Parenthetical] - shares shares in Thousands	3 Months Ended
Sep. 30, 2015	Sep. 30, 2014
Dividend Reinvestment Plan And Restricted Award Forfeited And Expired (in shares)	248	130

Stock Issued During Period Shares Dividend Reinvestment Plan And Restricted Award Forfeited And Expired.

No definition available.

Name:	cbkm_StockIssuedDuringPeriodSharesDividendReinvestmentPlanAndRestrictedAwardForfeitedAndExpired
Namespace Prefix:	cbkm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration