FAIR VALUE MEASUREMENTS: Fair Value Measurements, Nonrecurring, Valuation Techniques (Details 3) - Impaired loans - Level 3		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Techniques		Appraised value	Appraised value
Significant unobservable inputs		Adjustment for market conditions	Adjustment for market conditions
Market adjustment to appraisals	[1]

[1] There were no adjustments to appraised values of impaired loans as of March 31, 2018 and 2017.