Loans Receivable: Schedule of Accounts, Notes, Loans and Financing Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,182,159	$ 1,119,536
Deferred loan (costs) fees, net (2)	(151)	418
Loans receivable, allowance	15,227	15,657
Loans receivable, net	1,167,083	1,103,461
Unamortized loan purchase premiums	3,400
One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	475,836	385,116
One-to-four family, residential, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	233,785	185,320
One-to-four family residential non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	242,051	199,796
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, allowance	1,210	1,279	$ 1,366
Multifamily Permanent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	126,895	130,146
Multifamily Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans excluded from category	15,500	37,200
Commercial Real Estate Permanent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	407,882	419,417
Construction Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	78,120	93,455
Loans receivable, allowance	1,717	2,064	2,189
Construction/Land Development One-to-four family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	52,836	34,677
Construction Land Development Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	15,501	37,194
Construction Land Development Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	6,189
Loans excluded from category	9,800	12,900
Construction Land Development Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	9,783	15,395
Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	31,371	46,590
Loans receivable, allowance	948	1,112	1,242
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	62,055	44,812
Loans receivable, allowance	$ 1,912	$ 1,373	$ 1,069