Summary of Significant Accounting Policies Summary of Significant Accounting Policies Text Tag (Details)	12 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Cumulative Effect of New Accounting Principle	$ 5,300,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	0
FNMA & 3rd party loans excluded from financial statements	$ 18,300,000	$ 19,400,000
Number of Reportable Segments	1
Servicing fee income	$ 44,000	51,000
Mortgage Loans in Process of Foreclosure, Amount	$ 3,000,000.0	4,200,000
Accounting Standards Update 2016-01
Cumulative Effect of New Accounting Principle		0
Minimum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Minimum | Furnishings and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	25 years
Accumulated Deficit | Accounting Standards Update 2016-01
Cumulative Effect of New Accounting Principle		(721,000)
Accumulated Other Comprehensive Loss | Accounting Standards Update 2016-01
Cumulative Effect of New Accounting Principle		$ 721,000