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FAIR VALUE MEASUREMENTS: Assets measured at fair value on a non-recurring basis (Details 1) - Nonrecurring basis - Impaired loans - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total estimated fair value $ 394 $ 2,143
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total estimated fair value 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total estimated fair value 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total estimated fair value $ 394 $ 2,143