Other Non-interest Revenue and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Noninterest Income, Other [Abstract]
Grant income	$ 500	$ 0	$ 500	$ 0
Correspondent banking fees	601	0	680	0
Other	13	104	96	151
Total non-interest income	1,114	104	1,276	151
Non-interest expense:
Advertising	45	109	70	202
Legal expense	192	75	262	173
Insurance and surety	174	160	333	304
Audit expense	138	136	275	262
Outsourced service	22	89	47	245
Data lines / internet	96	102	208	210
Retail expenses	207	177	391	377
Director's fees	85	77	170	154
Other	440	284	1,042	837
Total non-interest expense	$ 1,399	$ 1,209	$ 2,798	$ 2,764