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COMMITMENTS AND CONTINGENCIES: Significant off-balance sheet commitments (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	$ 206,386
Commitments to originate loans: | Adjustable-rate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	29,187
Commitments to originate loans: | Fixed-rate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	12,956
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	2,357
Undisbursed loan funds and unused lines of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or Notional Amount	$ 161,886

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