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NET INCOME (LOSS) PER COMMON AND COMMON EQUIVALENT SHARE (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]                      
Potentially dilutive options outstanding                 49,277us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 49,277us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 89,877us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Net Income (Numerator)                      
Basic earnings (loss) available to common stockholders $ 484,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 317,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 414,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 357,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 416,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 271,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 212,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 213,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 1,571,838us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 1,111,953us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 532,003us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Nonvested restricted stock grant                         
Effect of dilutive securities: options to purchase common shares                         
Diluted earnings (loss)                 $ 1,571,838us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 1,111,953us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 532,003us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Shares (Denominator)                      
Basic (in shares)                 2,166,818us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 2,152,780us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 2,157,732us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Nonvested restricted stock grant (in shares)                 19,575czbs_IncrementalCommonSharesAttributableToNonvestedRestrictedStock 12,830czbs_IncrementalCommonSharesAttributableToNonvestedRestrictedStock 7,664czbs_IncrementalCommonSharesAttributableToNonvestedRestrictedStock
Effect of dilutive securities: options to purchase common shares (in shares)                         
Diluted (in shares)                 2,186,393us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 2,165,610us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 2,165,396us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per Share Amount                      
Basic earnings (loss) per share available to common stockholders (in dollars per share) $ 0.22us-gaap_EarningsPerShareBasic $ 0.15us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic $ 0.17us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic $ 0.13us-gaap_EarningsPerShareBasic $ 0.1us-gaap_EarningsPerShareBasic $ 0.1us-gaap_EarningsPerShareBasic $ 0.73us-gaap_EarningsPerShareBasic $ 0.52us-gaap_EarningsPerShareBasic $ 0.25us-gaap_EarningsPerShareBasic
Nonvested resticted stock grant (in dollars per share)                 $ (0.01)czbs_NonvestedRestictedStockGrantPerShare $ (0.01)czbs_NonvestedRestictedStockGrantPerShare   
Effect of dilutive securities: options to purchase common shares (in dollars per shares)                         
Diluted earnings (loss) per share (in dollars per share) $ 0.22us-gaap_EarningsPerShareDiluted $ 0.15us-gaap_EarningsPerShareDiluted $ 0.19us-gaap_EarningsPerShareDiluted $ 0.16us-gaap_EarningsPerShareDiluted $ 0.18us-gaap_EarningsPerShareDiluted $ 0.13us-gaap_EarningsPerShareDiluted $ 0.1us-gaap_EarningsPerShareDiluted $ 0.1us-gaap_EarningsPerShareDiluted $ 0.72us-gaap_EarningsPerShareDiluted $ 0.51us-gaap_EarningsPerShareDiluted $ 0.25us-gaap_EarningsPerShareDiluted