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Parent Only Financial Information (Condensed Statements of Operations) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Interest income $ 11,298us-gaap_InterestAndDividendIncomeOperating $ 11,332us-gaap_InterestAndDividendIncomeOperating
Provision for loan losses 300us-gaap_ProvisionForLoanAndLeaseLosses 443us-gaap_ProvisionForLoanAndLeaseLosses
Other non-interest expenses 8,123us-gaap_NoninterestExpense 7,681us-gaap_NoninterestExpense
Income before income taxes 993us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,391us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense 336us-gaap_IncomeTaxExpenseBenefit 452us-gaap_IncomeTaxExpenseBenefit
Net income (loss) 657us-gaap_NetIncomeLoss 939us-gaap_NetIncomeLoss
Preferred stock dividends 90us-gaap_PreferredStockDividendsIncomeStatementImpact 33us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income attributable to common shareholders 567us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 906us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Parent Company [Member]    
Interest income 121us-gaap_InterestAndDividendIncomeOperating
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
122us-gaap_InterestAndDividendIncomeOperating
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Equity in (loss) income of Bank 843cmsb_EquityInLossIncomeOfBank
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
873cmsb_EquityInLossIncomeOfBank
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Provision for loan losses 0us-gaap_ProvisionForLoanAndLeaseLosses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
72us-gaap_ProvisionForLoanAndLeaseLosses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other non-interest expenses 435us-gaap_NoninterestExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
92us-gaap_NoninterestExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income before income taxes 529us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
831us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income tax expense (128)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(108)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net income (loss) 657us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
939us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Preferred stock dividends 90us-gaap_PreferredStockDividendsIncomeStatementImpact
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
33us-gaap_PreferredStockDividendsIncomeStatementImpact
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net income attributable to common shareholders $ 567us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 906us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember