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INCOME TAXES: Schedule of Effective Income Tax Rate Reconciliation (Details 2)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Income Tax Disclosure [Abstract]      
Statutory federal income tax rate 34.00% 34.00% 34.00%
State and local income tax rate 1.50% 1.50% 1.60%
ESOP market value adjustment (0.10%) (0.10%)  
BOLI (3.80%) (2.80%) (3.80%)
Other, net (0.20%) 2.20% 0.40%
Effective federal income tax rate 31.40% 34.80% 32.20%