Securities (Details Textual) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Total Fair Value Of Federal Funds Pledged	$ 53

The total fair value amounts were pledged to secure public funds, securities sold under agreements to repurchase, as collateral for federal funds purchased from other financial institutions and serve as collateral for borrowings at the Federal Reserve Discount Window.

No definition available.

Name:	csbq_TotalFairValueOfFederalFundsPledged
Namespace Prefix:	csbq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant