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Consolidated Statements of Financial Condition Parentheticals (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Balance Sheet Parenthetical [Abstract]    
Held-to-maturity Securities, Fair Value $ 12,433us-gaap_HeldToMaturitySecuritiesFairValue $ 8,971us-gaap_HeldToMaturitySecuritiesFairValue [1]
Series D convertible preferred stock 45,118us-gaap_PreferredStockSharesIssued 45,118us-gaap_PreferredStockSharesIssued
Series D convertible preferred stock liquidation preference for Issued 1,000carv_PreferredStockLiquidationPreferenceForIssued 1,000carv_PreferredStockLiquidationPreferenceForIssued
Series D convertible preferred stock liquidation preference for Outstanding $ 1,000us-gaap_PreferredStockLiquidationPreference $ 1,000us-gaap_PreferredStockLiquidationPreference
Series D convertible preferred stock Par Value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Common Stock $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common Stock shares authorized 10,000,000us-gaap_CommonStockSharesAuthorized 10,000,000us-gaap_CommonStockSharesAuthorized
Common Stock shares Issued 3,698,031us-gaap_CommonStockSharesIssued 3,697,836us-gaap_CommonStockSharesIssued
Common Stock shares Outstanding 3,696,087us-gaap_CommonStockSharesOutstanding 3,695,892us-gaap_CommonStockSharesOutstanding
Treasury Stock 1,944us-gaap_TreasuryStockShares 1,944us-gaap_TreasuryStockShares
[1] * The carrying amount and amortized cost are the same for all held-to-maturity securities, as no OTTI has been recorded.