Commitments and Contingencies: Supply Commitment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Undisbursed portion of construction loans in process (see Note 4)	$ 103,194	$ 103,168
Undisbursed lines of credit	141,537	128,791
Commitments to extend credit	$ 31,667	$ 14,699