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COMMITMENTS AND CONTINGENCIES: Significant off-balance sheet commitments (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | $ 190,468 | $ 167,636
Commitments to originate loans: | Adjustable-rate |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | 20,065 | 16,958
Commitments to originate loans: | Fixed-rate |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | 14,989 | 28,301
Standby letters of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | 2,432 | 2,614
Undisbursed loan funds and unused lines of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | $ 152,982 | $ 119,763

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