Variable Interest Entities (Details) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2013
Entity Information [Line Items]
Variable Interest Entity, Initial Consolidation, Gain (Loss)		$ 1,100
Variable Interest Entity, Rights Transferred		24,000
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets		24,460
Variable Interest Entity, Total Involvment with SPE Asset		24,460
Variable Interest Entity, Funded Exposure, Debt Investment		15,549
Variable Interest Entity, Funded Exposure, Equity Invesment		401
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments		0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount		9,360
Variable Interest Entity, Total Exposure		25,310
Carver Statutory Trust 1
Entity Information [Line Items]
Variable Interest Entity, Initial Consolidation, Gain (Loss)		0
Variable Interest Entity, Rights Transferred		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		15,549	$ 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		15,949
CDE 18
Entity Information [Line Items]
Variable Interest Entity, Initial Consolidation, Gain (Loss)	[1]	600
Variable Interest Entity, Rights Transferred	[1]	13,254
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	[1]	0
Variable Interest Entity, Total Involvment with SPE Asset	[1]	0
Variable Interest Entity, Funded Exposure, Debt Investment	[1]	0
Variable Interest Entity, Funded Exposure, Equity Invesment	[1]	0
Variable Ineterest Entity, Unfunded Exposure, Funding Commitments	[1]	0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1]	5,169
Variable Interest Entity, Total Exposure	[1]	5,169
CDE 19
Entity Information [Line Items]
Variable Interest Entity, Initial Consolidation, Gain (Loss)		500
Variable Interest Entity, Rights Transferred		10,746
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets		11,060
Variable Interest Entity, Total Involvment with SPE Asset		11,060
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

[1] * Entity exited the NMTC project during fiscal year 2018 and remains on the above table pending final dissolution.