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DEPOSITS: Interest Expense by Deposit Type (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Deposits [Abstract]      
Interest-bearing checking $ 101 $ 100 $ 98
Money market 302 335 309
Savings accounts 145 133 110
Certificates of deposit 448 640 634
Total $ 996 $ 1,208 $ 1,151