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Variable Interest Entities VIE (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2013 | May 15, 2009 | Mar. 31, 2008
Entity Information [Line Items] |  |  |  |  |  |
Variable Interest Entity, Initial Consolidation, Gain (Loss) |  | $ 5,850 |  |  |  |
Variable Interest Entity, Rights Transferred |  | 149,000 |  |  | $ 40,000 |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 2,362 |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets |  | 103,289 |  |  |  |
Variable Interest Entity, Total Involvment with SPE Asset |  | 105,651 |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment |  | 13,000 |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment |  | 0 |  |  |  |
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments |  | 0 |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | 50,310 |  |  |  |
Variable Interest Entity, Total Exposure |  | 63,718 |  |  |  |
Carver Statutory Trust 1 [Member] |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Variable Interest Entity, Initial Consolidation, Gain (Loss) |  | 0 |  |  |  |
Variable Interest Entity, Rights Transferred |  | 0 |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 0 |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets |  | 13,400 |  |  |  |
Variable Interest Entity, Total Involvment with SPE Asset |  | 13,400 |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment |  | 13,000 |  | $ 13,000 |  |
Variable Interest Entity, Funded Exposure, Equity Invesment |  | 400 |  | $ 400 |  |
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments |  | 0 |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | 0 |  |  |  |
Variable Interest Entity, Total Exposure |  | 13,400 |  |  |  |
CDE 1-9, CDE 11-12 [Member] |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Variable Interest Entity, Initial Consolidation, Gain (Loss) | [1] | 0 |  |  |  |
Variable Interest Entity, Rights Transferred | [1] | 40,000 |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | [1] | 2,362 |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets | [1] | 0 |  |  |  |
Variable Interest Entity, Total Involvment with SPE Asset | [1] | 2,362 |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment | [1] | 0 |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment | [1],[2] | 0 |  |  |  |
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments | [1] | 0 |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | [1] | 7,800 |  |  |  |
Variable Interest Entity, Total Exposure | [1] | 7,800 |  |  |  |
CDE 10 [Member] |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Variable Interest Entity, Initial Consolidation, Gain (Loss) | [3] | 1,700 |  |  |  |
Variable Interest Entity, Rights Transferred |  | 19,000 | [3] |  |  | $ 19,000
Variable Interest Entity, Consolidated, Carrying Amount, Assets | [3] | 0 |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets | [3] | 0 |  |  |  |
Variable Interest Entity, Total Involvment with SPE Asset | [3] | 0 |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment | [3] | 0 |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment | [3] | 0 |  |  |  |
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments | [3] | 0 |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | [3] | 7,410 |  |  |  |
Variable Interest Entity, Total Exposure | [3] | 7,410 |  |  |  |
CDE 13 [Member] |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Variable Interest Entity, Initial Consolidation, Gain (Loss) |  | 500 |  |  |  |
Variable Interest Entity, Rights Transferred |  | 10,500 |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 0 |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets |  | 10,567 |  |  |  |
Variable Interest Entity, Total Involvment with SPE Asset |  | 10,567 |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment |  | 0 |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment |  | 1 |  |  |  |
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments |  | 0 |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | 4,095 |  |  |  |
Variable Interest Entity, Total Exposure |  | 4,096 |  |  |  |
CDE 14 [Member] |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Variable Interest Entity, Initial Consolidation, Gain (Loss) |  | 400 |  |  |  |
Variable Interest Entity, Rights Transferred |  | 10,000 |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 0 |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets |  | 10,034 |  |  |  |
Variable Interest Entity, Total Involvment with SPE Asset |  | 10,034 |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment |  | 0 |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment |  | 1 |  |  |  |
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments |  | 0 |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | 3,900 |  |  |  |
Variable Interest Entity, Total Exposure |  | 3,901 |  |  |  |
CDE 15, 16, 17 [Member] |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Variable Interest Entity, Initial Consolidation, Gain (Loss) |  | 900 |  |  |  |
Variable Interest Entity, Rights Transferred |  | 20,500 |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 0 |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets |  | 20,645 |  |  |  |
Variable Interest Entity, Total Involvment with SPE Asset |  | 20,645 |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment |  | 0 |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment |  | 2 |  |  |  |
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments |  | 0 |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | 7,995 |  |  |  |
Variable Interest Entity, Total Exposure |  | 7,997 |  |  |  |
CDE 18 [Member] |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Variable Interest Entity, Initial Consolidation, Gain (Loss) |  | 600 |  |  |  |
Variable Interest Entity, Rights Transferred |  | 13,254 |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 0 |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets |  | 13,282 |  |  |  |
Variable Interest Entity, Total Involvment with SPE Asset |  | 13,282 |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment |  | 0 |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment |  | 1 |  |  |  |
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments |  | 0 |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | 5,169 |  |  |  |
Variable Interest Entity, Total Exposure |  | 5,170 |  |  |  |
CDE 19 [Member] |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Variable Interest Entity, Initial Consolidation, Gain (Loss) |  | 500 |  |  |  |
Variable Interest Entity, Rights Transferred |  | 10,746 |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 0 |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets |  | 10,951 |  |  |  |
Variable Interest Entity, Total Involvment with SPE Asset |  | 10,951 |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment |  | 0 |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment |  | 1 |  |  |  |
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments |  | 0 |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | 4,191 |  |  |  |
Variable Interest Entity, Total Exposure |  | 4,192 |  |  |  |
CDE 20 [Member] |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Variable Interest Entity, Initial Consolidation, Gain (Loss) |  | 625 |  |  |  |
Variable Interest Entity, Rights Transferred |  | 12,500 |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 0 |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets |  | 12,129 |  |  |  |
Variable Interest Entity, Total Involvment with SPE Asset |  | 12,129 |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment |  | 0 |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment |  | 1 |  |  |  |
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments |  | 0 |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | 4,875 |  |  |  |
Variable Interest Entity, Total Exposure |  | 4,876 |  |  |  |
CDE 21 [Member] |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Variable Interest Entity, Initial Consolidation, Gain (Loss) |  | 625 |  |  |  |
Variable Interest Entity, Rights Transferred |  | 12,500 |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 0 |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets |  | 12,281 |  |  |  |
Variable Interest Entity, Total Involvment with SPE Asset |  | 12,281 |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment |  | 0 |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment |  | 1 |  |  |  |
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments |  | 0 |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | 4,875 |  |  |  |
Variable Interest Entity, Total Exposure |  | $ 4,876 |  |  |  |
[1] | (3) CDEs 2-9, 11-12 dissolved March 2016.
[2] | (1) Excludes any proceeds realized from exchange of equity interest in CDEs as detailed below.
[3] | (2) Entity dissolved May 2015.

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- Definition Variable Ineterest Entity, Unfunded Exposure, Funding Commitments + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Variable Interest Entity, Funded Exposure, Debt Investment + References No definition available. + Details
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Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Variable Interest Entity, Funded Exposure, Equity Invesment + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Variable Interest Entity, Rights Transferred + References No definition available. + Details
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Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Variable Interest Entity, Total Exposure + References No definition available. + Details
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- Definition Variable Interest Entity, Total Involvment with SPE Asset + References No definition available. + Details
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Balance Type: | debit
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5710-111685 + Details
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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5747-111685 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The gain (loss) recognized on initial consolidation of a variable interest entity (VIE) when the VIE is not a business (as defined). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5710-111685 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5728-111685 + Details
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Data Type: | xbrli:monetaryItemType
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