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Regulatory Matters (Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk weighted assets), Amount $ 23,699us-gaap_Capital $ 22,869us-gaap_Capital
Total capital (to risk weighted assets), Ratio 12.36%us-gaap_CapitalToRiskWeightedAssets 12.91%us-gaap_CapitalToRiskWeightedAssets
Tier 1 capital (to risk weighted assets), Amount 22,959us-gaap_TierOneRiskBasedCapital 21,946us-gaap_TierOneRiskBasedCapital
Tier 1 capital (to risk weighted assets), Ratio 11.97%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 12.39%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Tier 1 capital (to adjusted assets), Amount 22,959cmsb_TierOneRiskBasedCapitalToAdjustedAssets 21,946cmsb_TierOneRiskBasedCapitalToAdjustedAssets
Tier 1 capital (to adjusted assets), Ratio 8.40%cmsb_TierOneCapitalToAdjustedAssetsRatio 8.49%cmsb_TierOneCapitalToAdjustedAssetsRatio
Tangible capital (to tangible assets), Amount 22,959us-gaap_TangibleCapital 21,946us-gaap_TangibleCapital
Tangible capital (to tangible assets), Ratio 8.40%us-gaap_TangibleCapitalToTangibleAssets 8.49%us-gaap_TangibleCapitalToTangibleAssets
Minimum [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk weighted assets) For Capital Adequacy Purposes, Amount 15,338us-gaap_CapitalRequiredForCapitalAdequacy
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
14,176us-gaap_CapitalRequiredForCapitalAdequacy
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total capital (to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 19,173us-gaap_CapitalRequiredToBeWellCapitalized
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
17,720us-gaap_CapitalRequiredToBeWellCapitalized
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total capital (to risk weighted assets) For Capital Adequacy Purposes, Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total capital (to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 capital (to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 11,504us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
10,632us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 capital (to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 capital (to adjusted assets) For Capital Adequacy Purposes, Amount 10,930cmsb_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToAdjustedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
10,342cmsb_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToAdjustedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 capital (to adjusted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 13,662cmsb_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToAdjustedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
12,928cmsb_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToAdjustedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 capital (to adjusted assets) For Capital Adequacy Purposes, Ratio 4.00%cmsb_TierOneCapitalToAdjustedAssetsForCapitalAdequacyPurposesRatio
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
4.00%cmsb_TierOneCapitalToAdjustedAssetsForCapitalAdequacyPurposesRatio
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 capital (to adjusted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 5.00%cmsb_TierOneCapitalToAdjustedAssetsCapitalizedUnderPromptCorrectiveActionProvisionsRatio
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
5.00%cmsb_TierOneCapitalToAdjustedAssetsCapitalizedUnderPromptCorrectiveActionProvisionsRatio
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tangible capital (to tangible assets) For Capital Adequacy Purposes, Amount $ 4,099us-gaap_TangibleCapitalRequiredForCapitalAdequacy
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 3,878us-gaap_TangibleCapitalRequiredForCapitalAdequacy
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tangible capital (to tangible assets) For Capital Adequacy Purposes, Ratio 1.50%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
1.50%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember