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COMMITMENTS AND CONTINGENCIES: Significant off-balance sheet commitments (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total	$ 184,214
Commitments to originate loans: | Adjustable-rate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total	34,799
Commitments to originate loans: | Fixed-rate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total	6,886
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total	2,410
Undisbursed loan funds and unused lines of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total	$ 140,119

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