Non-interest Revenue and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income and Expenses [Abstract]
Grant income	$ 500	$ 0
Correspondent banking fees	1,235	0
Other	276	184
Total non-interest income	2,011	184
Advertising	380	281
Legal expense	498	611
Insurance and surety	766	621
Audit expense	378	537
Outsourced service	100	304
Data lines / internet	432	412
Retail expenses	825	733
Director's fees	366	331
Other	1,649	1,776
Other Noninterest Expense	$ 5,394	$ 5,606