Loans Receivable: Financing Receivables, Summary of loans by type and risk category (Details) - USD ($)	Sep. 30, 2018		Dec. 31, 2017
One to four family residential
Financing Receivable, Net	$ 327,924,000		$ 278,655,000
Multifamily
Financing Receivable, Net	176,521,000	[1],[2]	184,902,000	[3],[4]
Commercial Real Estate
Financing Receivable, Net	360,261,000	[1],[2]	361,299,000	[3],[4]
Construction Land Development
Financing Receivable, Net	103,009,000	[1],[2]	145,618,000	[3],[4]
Business
Financing Receivable, Net	29,655,000	[1],[2]	23,087,000	[3],[4]
Consumer
Financing Receivable, Net	12,419,000	[1],[2]	9,133,000	[3],[4]
Property total
Financing Receivable, Net	1,009,789,000	[1],[2],[5],[6]	1,002,694,000	[3],[4],[7],[8]
One-to-four family, residential, owner occupied
Financing Receivable, Net	184,698,000	[1],[2]	148,304,000	[3],[4]
One to four family residential non owner occupied
Financing Receivable, Net	143,226,000	[1],[2]	130,351,000	[3],[4]
Performing Financing Receivable | One to four family residential
Financing Receivable, Net	327,811,000	[9]	278,527,000	[10]
Performing Financing Receivable | Multifamily
Financing Receivable, Net	176,521,000	[9]	184,902,000	[10]
Performing Financing Receivable | Commercial Real Estate
Financing Receivable, Net	359,936,000	[9]	361,299,000	[10]
Performing Financing Receivable | Construction Land Development
Financing Receivable, Net	103,009,000	[9]	145,618,000	[10]
Performing Financing Receivable | Business
Financing Receivable, Net	29,655,000	[9]	23,087,000	[10]
Performing Financing Receivable | Consumer
Financing Receivable, Net	12,373,000	[9]	9,082,000	[10]
Performing Financing Receivable | Property total
Financing Receivable, Net	1,009,305,000	[6],[9]	1,002,515,000	[7],[10]
Performing Financing Receivable | One-to-four family, residential, owner occupied
Financing Receivable, Net	184,600,000		148,200,000
Performing Financing Receivable | One to four family residential non owner occupied
Financing Receivable, Net	143,200,000		130,300,000
Nonperforming Financing Receivable | One to four family residential
Financing Receivable, Net	113,000	[11]	128,000	[12]
Nonperforming Financing Receivable | Multifamily
Financing Receivable, Net	0	[11]	0	[12]
Nonperforming Financing Receivable | Commercial Real Estate
Financing Receivable, Net	325,000	[11]	0	[12]
Nonperforming Financing Receivable | Construction Land Development
Financing Receivable, Net	0	[11]	0	[12]
Nonperforming Financing Receivable | Business
Financing Receivable, Net	0	[11]	0	[12]
Nonperforming Financing Receivable | Consumer
Financing Receivable, Net	46,000	[11]	51,000	[12]
Nonperforming Financing Receivable | Property total
Financing Receivable, Net	484,000	[6],[11]	179,000	[7],[12]
Nonperforming Financing Receivable | One-to-four family, residential, owner occupied
Financing Receivable, Net	113,000		128,000
Pass | One to four family residential
Financing Receivable, Net	325,509,000		275,653,000
Pass | Multifamily
Financing Receivable, Net	176,521,000		184,902,000
Pass | Commercial Real Estate
Financing Receivable, Net	359,021,000		358,285,000
Pass | Construction Land Development
Financing Receivable, Net	103,009,000		145,618,000
Pass | Business
Financing Receivable, Net	29,655,000		23,087,000
Pass | Consumer
Financing Receivable, Net	12,373,000		8,893,000
Pass | Property total
Financing Receivable, Net	1,006,088,000	[5]	996,438,000	[8]
Special Mention | One to four family residential
Financing Receivable, Net	1,762,000		2,329,000
Special Mention | Multifamily
Financing Receivable, Net	0		0
Special Mention | Commercial Real Estate
Financing Receivable, Net	370,000		2,459,000
Special Mention | Construction Land Development
Financing Receivable, Net	0		0
Special Mention | Business
Financing Receivable, Net	0		0
Special Mention | Consumer
Financing Receivable, Net	0		188,000
Special Mention | Property total
Financing Receivable, Net	2,132,000	[5]	4,976,000	[8]
Substandard | One to four family residential
Financing Receivable, Net	653,000		673,000
Substandard | Multifamily
Financing Receivable, Net	0		0
Substandard | Commercial Real Estate
Financing Receivable, Net	870,000		555,000
Substandard | Construction Land Development
Financing Receivable, Net	0		0
Substandard | Business
Financing Receivable, Net	0		0
Substandard | Consumer
Financing Receivable, Net	46,000		52,000
Substandard | Property total
Financing Receivable, Net	$ 1,569,000	[5]	$ 1,280,000	[8]

[1] Net of LIP.

[2] There were no loans 90 days and greater past due and still accruing interest at September 30, 2018.

[3] Net of LIP.

[4] There were no loans 90 days and greater past due and still accruing interest at December 31, 2017.

[5] Net of LIP.

[6] Net of LIP.

[7] Net of LIP.

[8] Net of LIP.

[9] There were $184.6 million of owner-occupied one-to-four family residential loans and $143.2 million of non-owner occupied one-to-four family residential loans classified as performing.

[10] There were $148.2 million of owner-occupied one-to-four family residential loans and $130.3 million of non-owner occupied one-to-four family residential loans classified as performing.

[11] The $113,000 of one-to-four family residential loans classified as nonperforming are all owner-occupied. December 31, 2017 One-to-FourFamilyResidential Multifamily CommercialReal Estate Construction/Land Business Consumer Total (1) (In thousands)Performing (2)$278,527 $184,902 $361,299 $145,618 $23,087 $9,082 $1,002,515Nonperforming (3)128 — — — — 51 179Total loans$278,655 $184,902 $361,299 $145,618 $23,087 $9,133 $1,002,694

[12] The $128,000 of one-to-four family residential loans classified as nonperforming are all owner-occupied.