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Fair Value Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	$ 386,804csbq_ImpairedLoansFairValueDisclosure	$ 2,190,522csbq_ImpairedLoansFairValueDisclosure
Foreclosed assets	8,523,267csbq_ForeclosedAssetsFairValue	8,000,365csbq_ForeclosedAssetsFairValue
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	0	0
Foreclosed assets	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	0	0
Foreclosed assets	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	386,804	2,190,522
Foreclosed assets	$ 8,523,267	$ 8,000,365