Fair Value: Schedule of balances of assets and liabilities, measured at fair value on a non-recurring basis (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (included in loans receivable, net)	$ 46,775,000	$ 48,521,000
Total, Fair Value	46,775,000	48,521,000
Financing receivable, allowance for credit losses, individually evaluated for impairment		13,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (included in loans receivable, net)	0	0
Total, Fair Value	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (included in loans receivable, net)	0	0
Total, Fair Value	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (included in loans receivable, net)	46,775,000	48,521,000
Total, Fair Value	$ 46,775,000	$ 48,521,000