2.4.0.8128 - Disclosure - Loans - Additional Information (Detail)truefalsefalse1false USDfalsefalse$eol_PE10141---1310-Q0004_STD_91_20130630_0http://www.sec.gov/CIK0000880417duration2013-04-01T00:00:002013-06-30T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170pureStandardhttp://www.xbrl.org/2003/instancepure0USDUSD$2false USDfalsefalse$eol_PE10141---1310-Q0004_STD_91_20120630_0http://www.sec.gov/CIK0000880417duration2012-04-01T00:00:002012-06-30T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$eol_PE10141---1310-Q0004_STD_181_20130630_0http://www.sec.gov/CIK0000880417duration2013-01-01T00:00:002013-06-30T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170pureStandardhttp://www.xbrl.org/2003/instancepure0USDUSD$4false 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2csbb_OwnerOccupiedCommercialRealEstateLoanscsbb_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.790.79falsefalsefalse2falsetruefalse00falsefalsefalse3truetruefalse0.790.79falsefalsefalse4falsetruefalse00falsefalsefalse5truetruefalse0.810.81falsefalsefalsenum:percentItemTypepureOwner occupied commercial real estate loans.No definition available.false0Percentage of outstanding principal balances of commercial real estate loans secured by owner-occupied properties3false 2csbb_LoansServicedForOtherscsbb_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse6410000064100000USD$falsetruefalse4falsefalsefalse00falsefalsefalse5truefalsefalse6020000060200000USD$falsetruefalsexbrli:monetaryItemTypemonetaryLoans serviced for others.No definition available.false2Loans serviced for others4false 2csbb_LoansAndLeaseReceivableConcentrationAmountcsbb_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryLoans and lease receivable concentration amount.No definition available.false2Concentrations of loans related to a single industry5false 2us-gaap_FinancingReceivableModificationsRecordedInvestmentus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse77000007700000falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse77000007700000falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse87000008700000falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 false2Troubled debt restructurings, loans6false 2csbb_ReservesAllocatedToTroubledDebtRestructuringscsbb_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse781000781000falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse781000781000falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse718000718000falsefalsefalsexbrli:monetaryItemTypemonetaryReserves allocated to troubled debt restructurings.No definition available.false2Reserves allocated to customers whose loan terms are modified in troubled debt restructurings7false 2csbb_LoansClassifiedAsTroubledDebtRestructuringsPerformingcsbb_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse70000007000000falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse70000007000000falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryLoans classified as troubled debt restructurings performing.No definition available.false2Loans classified as troubled debt restructurings modified terms8false 2csbb_LoansClassifiedAsTroubledDebtRestructuringsNonaccrualStatuscsbb_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse679000679000falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse679000679000falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryLoans classified as troubled debt restructurings nonaccrual status.No definition available.false2Loans classified as troubled debt restructurings nonaccrual status9false 2us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1us-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00  falsefalsefalse2falsefalsefalse00  falsefalsefalse3falsefalsefalse00  falsefalsefalse4falsefalsefalse00  falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524 false2Loans restructured, Subsequently Defaulted10false 2csbb_MinimumBalanceCommercialLoansRatedcsbb_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse275000275000falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse275000275000falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryMinimum balance commercial loans rated.No definition available.false2Outstanding balance of commercial loans classified under credit risk, minimum amount11false 2csbb_LoansListedAsNotRatedUnderRiskCategorycsbb_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse275000275000USD$falsetruefalse2falsefalsefalse00falsefalsefalse3truefalsefalse275000275000USD$falsetruefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryLoans listed as not rated under risk category.No definition available.false2Loans listed as not rated under risk category, maximum amount12false 2csbb_NonPerformingLoansPastDuecsbb_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse0090 daysfalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse0090 daysfalsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:durationItemTypenaNon performing loans past due.No definition available.false0Non-performing loans past due days and greaterfalseLoans - Additional Information (Detail) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.csb1.com/taxonomy/role/DisclosureLoansAdditionalInformation512