Variable Interest Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2013
Entity Information [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	$ 676,748	$ 578,770
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	16,110		$ 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	$ 16,510