Fair Values of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Commitments to extend credit and letters of credit	$ 113.6	$ 107.4

Commitments to extend credit and letters of credit.

No definition available.

Name:	csbb_CommitmentsToExtendCreditAndLettersOfCredit
Namespace Prefix:	csbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant