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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
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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

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Disclosure of the unamortized amount of the premium on the note or receivable which is added to the face amount of the receivable or loan. The discount or premium is defined as the difference between the present value and the face amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 + Details
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