Loans Receivable: Schedule of Accounts, Notes, Loans and Financing Receivable (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0	$ 0
Loans receivable	1,095,192,000	900,187,000
Loans in process (“LIP”)	92,498,000	72,026,000
Deferred loan fees, net	1,150,000	2,167,000
Loans receivable allowance for loan losses	12,882,000	10,951,000
Loans receivable, net	988,662,000	815,043,000
One-to-four family, residential, owner occupied
Loans receivable	148,304,000	137,834,000
One-to-four family residential non-owner occupied
Loans receivable	130,351,000	111,601,000
One-to-four family construction
Loans excluded from category	2,600,000	2,600,000
One-to-four family
Loans receivable	278,655,000	249,435,000
Multifamily Permanent
Loans receivable	184,902,000	123,250,000
Multifamily Construction
Loans excluded from category	71,400,000	62,900,000
Multifamily
Loans receivable	184,902,000	123,250,000
Loans receivable allowance for loan losses	1,820,000	1,199,000	$ 1,193,000	$ 1,606,000
Commercial Real Estate Permanent
Loans receivable	361,842,000	303,694,000
Commercial Real Estate
Loans receivable	361,842,000	303,694,000
Construction/Land Development One-to-four family residential
Loans receivable	87,404,000	67,842,000
Construction Land Development Multifamily
Loans receivable	108,439,000	111,051,000
Construction Land Development Commercial
Loans excluded from category	35,900,000	26,900,000
Loans receivable	5,325,000	0
Construction Land Development Land Development
Loans receivable	36,405,000	30,055,000
Construction Land Development
Loans receivable	237,573,000	208,948,000
Loans receivable allowance for loan losses	2,816,000	2,792,000	1,193,000	519,000
Business
Loans receivable	23,087,000	7,938,000
Loans receivable allowance for loan losses	694,000	237,000	229,000	47,000
Consumer
Loans receivable	9,133,000	6,922,000
Loans receivable allowance for loan losses	$ 297,000	$ 279,000	$ 425,000	$ 152,000