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Commitments and Contingencies Commitments and Contingencies-Representation and Warranty Reserves (Details) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 USD ($)
Representation and warranty reserve [Abstract] |  |
Representation and warranty repurchase reserve, beginning of period | $ 205 | [1]
Provision for mortgage representation and warranty losses | 21 | [2]
Representation and warranty repurchase reserve, end of period | $ 226 | [1]
[1] | (1) Reported in consolidated statements of financial condition as a component of other liabilities
[2] | 2) Component of other non-interest expense.

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- Definition Representation and warranty reserve [Abstract] + References No definition available. + Details
Name: | carv_RepresentationAndWarrantyReserveAbstract
Namespace Prefix: | carv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration