Loans Receivable: Schedule of Accounts, Notes, Loans and Financing Receivable (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	$ 3,100,000	$ 0
Loans receivable	1,122,238,000	1,037,429,000
Deferred loan fees, net	558,000	1,178,000
Loans receivable allowance for loan losses	13,218,000	13,347,000
Loans receivable, net	1,108,462,000	1,022,904,000
One-to-four family, residential, owner occupied
Loans receivable	210,898,000	194,141,000
One-to-four family residential non-owner occupied
Loans receivable	161,630,000	147,825,000
One-to-four family construction
Loans excluded from category	3,500,000	602,000
Commercial Real Estate Construction [Member]
Loans excluded from category	18,300,000	10,000,000
One-to-four family
Loans receivable	372,528,000	341,966,000
Multifamily Permanent
Loans receivable	172,915,000	169,355,000
Multifamily Construction
Loans excluded from category	38,600,000	25,200,000
Multifamily
Loans receivable	172,915,000	169,355,000
Loans receivable allowance for loan losses	1,607,000	1,680,000	$ 1,820,000
Commercial Real Estate Permanent
Loans receivable	395,152,000	373,798,000
Commercial Real Estate
Loans receivable	395,152,000	373,798,000
Construction/Land Development One-to-four family residential
Loans receivable	44,491,000	51,747,000
Construction Land Development Multifamily
Loans receivable	40,954,000	40,502,000
Construction Land Development Commercial
Loans excluded from category	8,700,000	6,200,000
Loans receivable	19,550,000	9,976,000
Construction Land Development Land Development
Loans receivable	8,670,000	6,629,000
Construction Land Development
Loans receivable	113,665,000	108,854,000
Loans receivable allowance for loan losses	2,222,000	2,331,000	2,816,000
Business
Loans receivable	37,779,000	30,486,000
Loans receivable allowance for loan losses	1,140,000	936,000	694,000
Consumer
Loans receivable	30,199,000	12,970,000
Loans receivable allowance for loan losses	$ 656,000	$ 236,000	$ 297,000