Summary of Significant Accounting Policies Summary of Significant Accounting Policies Text Tag (Details)	12 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Available-for-sale Securities, Gross Unrealized Losses	$ 1,164,000	$ 2,726,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net			$ 0
FNMA & 3rd party loans excluded from financial statements	19,400,000	23,100,000
Number of Reportable Segments			1
Mortgage servicing rights	180,000	181,000
Servicing fee income	51,000	63,000
Other Real Estate, Foreclosed Assets, and Repossessed Assets	404,000
Mortgage Loans in Process of Foreclosure, Amount	$ 4,200,000	3,300,000
Other investments
Available-for-sale Securities, Gross Unrealized Losses		$ 649,000