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Commitments and Contingencies-Representation and Warranty Reserves (Details) $ in Thousands | 12 Months Ended
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Mar. 31, 2025 USD ($)
Representation and warranty reserve [Abstract] |  |
Representation and warranty repurchase reserve, beginning of period | $ 86 | [1]
Provision for mortgage representation and warranty losses | (6) | [2]
Representation and warranty repurchase reserve, end of period | $ 80 | [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
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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://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-10 + Details
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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 + Details
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Data Type: | xbrli:monetaryItemType
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