CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY [Parenthetical] - shares	3 Months Ended	6 Months Ended
Dec. 31, 2015	Dec. 31, 2015
Dividend Reinvestment Plan And Restricted Award Forfeited And Expired (in shares)	27	275

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