Other Non-interest Revenue and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Noninterest Income, Other [Abstract]
Grant income	$ 0	$ 0	$ 500	$ 0
Correspondent banking fees	7	0	687	0
Compliance fee	78	(9)	78	47
Other	57	46	153	139
Total non-interest income	142	37	1,418	186
Non-interest expense:
Advertising	119	32	189	234
Legal expense	93	316	355	489
Insurance and surety	232	158	565	463
Audit expense	138	136	413	398
Outsourced service	21	33	67	277
Data lines / internet	109	105	318	315
Retail expenses	216	175	607	551
Director's fees	85	77	255	232
Other	446	581	1,488	1,416
Total non-interest expense	$ 1,459	$ 1,613	$ 4,257	$ 4,375