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COMMITMENTS AND CONTINGENCIES: Schedule of significant off-balance sheet commitments (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Mar. 31, 2016
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | $ 167,636 | $ 144,877
Commitments to originate loans: | Adjustable-rate |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | 16,958 | 25,186
Commitments to originate loans: | Fixed-rate |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | 28,301 | 16,689
Standby letters of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | 2,614 | 1,379
Undisbursed loan funds and unused lines of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | $ 119,763 | $ 101,623

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