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Variable Interest Entities VIE (Details) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2015		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		14,186
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets		103,414
Variable Interest Entity, Total Involvment with SPE Asset		117,600
Variable Interest Entity, Funded Exposure, Debt Investment		13,000
Variable Interest Entity, Funded Exposure, Equity Invesment	[1]	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	[1]	$ 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)		0
Variable Interest Entity, Rights Transferred		40,000
Variable Interest Entity, Consolidated, Carrying Amount, Assets		14,186
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets		0
Variable Interest Entity, Total Involvment with SPE Asset		14,186
Variable Interest Entity, Funded Exposure, Debt Investment		0
Variable Interest Entity, Funded Exposure, Equity Invesment	[1]	0
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments		0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount		7,800
Variable Interest Entity, Total Exposure		7,800
CDE 10 [Member]
Entity Information [Line Items]
Variable Interest Entity, Initial Consolidation, Gain (Loss)		1,700
Variable Interest Entity, Rights Transferred		19,000				$ 19,000
Variable Interest Entity, Consolidated, Carrying Amount, Assets		0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets		8
Variable Interest Entity, Total Involvment with SPE Asset		8
Variable Interest Entity, Funded Exposure, Debt Investment		0
Variable Interest Entity, Funded Exposure, Equity Invesment	[1]	0
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments		0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount		7,410
Variable Interest Entity, Total Exposure		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]	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]	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		20,711
Variable Interest Entity, Total Involvment with SPE Asset		20,711
Variable Interest Entity, Funded Exposure, Debt Investment		0
Variable Interest Entity, Funded Exposure, Equity Invesment	[1]	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]	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		10,922
Variable Interest Entity, Total Involvment with SPE Asset		10,922
Variable Interest Entity, Funded Exposure, Debt Investment		0
Variable Interest Entity, Funded Exposure, Equity Invesment	[1]	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		12,219
Variable Interest Entity, Total Involvment with SPE Asset		12,219
Variable Interest Entity, Funded Exposure, Debt Investment		0
Variable Interest Entity, Funded Exposure, Equity Invesment	[1]	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		12,271
Variable Interest Entity, Total Involvment with SPE Asset		12,271
Variable Interest Entity, Funded Exposure, Debt Investment		0
Variable Interest Entity, Funded Exposure, Equity Invesment	[1]	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] (1) Excludes any proceeds realized from exchange of equity interest in CDEs as detailed below.

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The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 810



-SubTopic 10



-Section 50



-Paragraph 3



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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



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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.

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