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Transaction and Litigation - Customers Bancorp, Inc. (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Transaction and Litigation - Customers Bancorp, Inc. [Abstract]    
Business Combination, Termination Fee Receivable $ 1.0cmsb_BusinessCombinationTerminationFeeReceivable  
Preferred Stock, Shares Issued 1,500us-gaap_PreferredStockSharesIssued 1,500us-gaap_PreferredStockSharesIssued
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, Liquidation Preference Per Share $ 1,000us-gaap_PreferredStockLiquidationPreference $ 1,000us-gaap_PreferredStockLiquidationPreference
Preferred Stock, Dividend Rate, Percentage 6.00%us-gaap_PreferredStockDividendRatePercentage 6.00%us-gaap_PreferredStockDividendRatePercentage