ALLOWANCE FOR LOAN LOSSES: Analysis of loans by aging category (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Allowance for unfunded loan commitments
Beginning balance	$ 388	$ 324	$ 259
Net change in allowance for unfunded loan commitments	92	64	65
Ending Balance	$ 480	$ 388	$ 324