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Loan Receivable and Allowance for Loan and Lease Losses Loans receivable, net of allowance for loan losses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Leases Receivable, Gross, Carrying Amount $ 434,270us-gaap_LoansAndLeasesReceivableGrossCarryingAmount   $ 389,814us-gaap_LoansAndLeasesReceivableGrossCarryingAmount      
Percentage of Loan Type 100.00%carv_PercentageOfLoanType   100.00%carv_PercentageOfLoanType      
Premium on loans 1,400us-gaap_ReceivableWithImputedInterestPremium   957us-gaap_ReceivableWithImputedInterestPremium      
Deferred fees and loan discounts, net (136)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums   (815)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums      
Allowance for loan losses (5,880)us-gaap_LoansAndLeasesReceivableAllowance (6,597)us-gaap_LoansAndLeasesReceivableAllowance (7,233)us-gaap_LoansAndLeasesReceivableAllowance (8,415)us-gaap_LoansAndLeasesReceivableAllowance (9,399)us-gaap_LoansAndLeasesReceivableAllowance (10,989)us-gaap_LoansAndLeasesReceivableAllowance
Total loans receivable, net 429,654us-gaap_LoansAndLeasesReceivableNetReportedAmount   382,723us-gaap_LoansAndLeasesReceivableNetReportedAmount      
One- to four family loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Leases Receivable, Gross, Carrying Amount 125,994us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= carv_OneToFourFamilyLoansMember
  111,220us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= carv_OneToFourFamilyLoansMember
     
Percentage of Loan Type 29.00%carv_PercentageOfLoanType
/ us-gaap_ProductOrServiceAxis
= carv_OneToFourFamilyLoansMember
  29.00%carv_PercentageOfLoanType
/ us-gaap_ProductOrServiceAxis
= carv_OneToFourFamilyLoansMember
     
Multifamily Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Leases Receivable, Gross, Carrying Amount 63,576us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= carv_MultifamilyLoansMember
  47,399us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= carv_MultifamilyLoansMember
     
Percentage of Loan Type 15.00%carv_PercentageOfLoanType
/ us-gaap_ProductOrServiceAxis
= carv_MultifamilyLoansMember
  12.00%carv_PercentageOfLoanType
/ us-gaap_ProductOrServiceAxis
= carv_MultifamilyLoansMember
     
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Leases Receivable, Gross, Carrying Amount 200,892us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
  198,808us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
     
Percentage of Loan Type 46.00%carv_PercentageOfLoanType
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
  51.00%carv_PercentageOfLoanType
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
     
Construction Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Leases Receivable, Gross, Carrying Amount 5,104us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
  5,100us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
     
Percentage of Loan Type 1.00%carv_PercentageOfLoanType
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
  1.00%carv_PercentageOfLoanType
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConstructionLoansMember
     
Business [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Leases Receivable, Gross, Carrying Amount 38,371us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember
  27,149us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember
     
Percentage of Loan Type 9.00%carv_PercentageOfLoanType
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember
  7.00%carv_PercentageOfLoanType
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember
     
Consumer Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and Leases Receivable, Gross, Carrying Amount $ 333us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember
[1]   $ 138us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember
[1]      
Percentage of Loan Type 0.00%carv_PercentageOfLoanType
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember
[1]   0.00%carv_PercentageOfLoanType
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember
[1]      
[1] (1) Includes personal loans