Debt instrument term of principal and interest payments deferred.

No definition available.

Name:	csbb_DebtInstrumentTermOfPrincipalAndInterestPaymentsDeferred
Namespace Prefix:	csbb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Eligibility for business to apply loans.

+ References

No definition available.

+ Details

Name:	csbb_EligibilityForBusinessToApplyLoans
Namespace Prefix:	csbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Maximum value of applications received for loan.

+ References

No definition available.

+ Details

Name:	csbb_MaximumValueOfApplicationsReceivedForLoan
Namespace Prefix:	csbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of applications received for loan.

+ References

No definition available.

+ Details

Name:	csbb_NumberOfApplicationsReceivedForLoan
Namespace Prefix:	csbb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of times for loans to qualifying businesses average monthly payroll cost.

+ References

No definition available.

+ Details

Name:	csbb_NumberOfTimesForLoansToQualifyingBusinessesAverageMonthlyPayrollCost
Namespace Prefix:	csbb_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of guarantee loans made to eligible borrowers.

+ References

No definition available.

+ Details

Name:	csbb_PercentageOfGuaranteeLoansMadeToEligibleBorrowers
Namespace Prefix:	csbb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of loan proceeds used for other qualifying expenses.

+ References

No definition available.

+ Details

Name:	csbb_PercentageOfLoanProceedsUsedForOtherQualifyingExpenses
Namespace Prefix:	csbb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of loan proceeds are used for payroll expenses.

+ References

No definition available.

+ Details

Name:	csbb_PercentageOfLoanProceedsUsedForPayrollExpenses
Namespace Prefix:	csbb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554

+ Details

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis=csbb_PaycheckProtectionProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events - Additional Information (Detail)			3 Months Ended
Subsequent Events - Additional Information (Detail)	May 05, 2020 USD ($) Loan	Mar. 27, 2020 USD ($)	Mar. 31, 2020 USD ($) Contract	Mar. 31, 2019 Contract	Dec. 31, 2019 USD ($)
Subsequent Event [Line Items]
Number of loans restructured \| Contract			1	1
Loans classified as troubled debt restructurings			$ 2,400,000		$ 2,500,000
Commercial [Member]
Subsequent Event [Line Items]
Number of loans restructured \| Contract			1
Consumer [Member]
Subsequent Event [Line Items]
Number of loans restructured \| Contract				1
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of loans restructured \| Loan	213
Loans classified as troubled debt restructurings	$ 65,700,000
Subsequent Event [Member] \| Commercial [Member]
Subsequent Event [Line Items]
Number of loans restructured \| Loan	151
Loans classified as troubled debt restructurings	$ 61,700,000
Subsequent Event [Member] \| Residential Real Estate [Member]
Subsequent Event [Line Items]
Number of loans restructured \| Loan	31
Loans classified as troubled debt restructurings	$ 3,400,000
Subsequent Event [Member] \| Consumer [Member]
Subsequent Event [Line Items]
Number of loans restructured \| Loan	31
Loans classified as troubled debt restructurings	$ 559,000,000
Maximum [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Term of principal and interest payments deferred	4 months
Minimum [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Term of principal and interest payments deferred	3 months
Paycheck Protection Program [Member]
Subsequent Event [Line Items]
Interest rate		1.00%
Loan term to maturity		2 years
Term of principal and interest payments deferred		6 months
Percentage of guarantee loans made to eligible borrowers		100.00%
Percentage of loan proceeds used for payroll expenses		75.00%
Percentage of loan proceeds used for other qualifying expenses		25.00%
Paycheck Protection Program [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Number of applications received for loan \| Loan	667
Maximum value of applications received for loan	$ 91,600
Paycheck Protection Program [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Eligibility for business to apply loans		$ 10,000,000
Number of times for loans to qualifying businesses average monthly payroll costs		2.5