Name:	cshb_ForeclosedAssetsFairValueDisclosure
Namespace Prefix:	cshb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

It represents value for foreclosed assets written.

No definition available.

Name:	cshb_ForeclosedAssetsWrittenDown
Namespace Prefix:	cshb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

It represents value for loans additional provisions.

No definition available.

Name:	cshb_LoansAdditionalProvisions
Namespace Prefix:	cshb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

Name:	us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of allowance for credit losses related to recorded investment.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524