Non-interest Revenue and Expense Other Non-interest Revenue and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Noninterest Income, Other [Abstract]
Depository fees and charges	$ 188	$ 16	$ 208	$ 79
Compliance fee	28	44	56	180
Other	76	(36)	93	10
Total non-interest income	292	24	357	269
Non-interest expense:
Advertising	109	97	202	176
Legal expense	75	102	173	243
Insurance and surety	160	203	304	368
Audit expense	136	143	262	331
Outsourced service	89	174	245	308
Data lines / internet	102	96	210	172
Retail expenses	177	211	377	414
Regulatory assessment	53	86	108	174
Director's fees	77	86	154	173
Other	419	598	935	1,198
Total non-interest expense	$ 1,397	$ 1,796	$ 2,970	$ 3,557