Loans Receivable: Non-performing Loans, Foregone interest, and loans committed (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 677,033,000	[1],[2],[3]	$ 678,727,000	[1],[2],[4]
One-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	273,565,000		280,674,000
Multifamily
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	120,271,000	[1],[3]	117,181,000	[2],[4]
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	247,968,000	[1],[3]	247,402,000	[2],[4]
Construction Land Development
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	24,316,000	[1],[3]	23,127,000	[2],[4]
Business
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,783,000	[1],[3]	1,142,000	[2],[4]
Consumer
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	7,130,000	[1],[3]	9,201,000	[2],[4]
One-to-four family residential non-owner occupied
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	112,552,000	[1],[3]	121,877,000	[2],[4]
One-to-four family, residential, owner occupied
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	161,013,000	[1],[3]	158,797,000	[2],[4]
Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	675,694,000	[2]	674,732,000	[2]
Performing Financing Receivable | One-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	272,735,000		278,377,000
Performing Financing Receivable | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	120,271,000		116,948,000
Performing Financing Receivable | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	247,534,000		246,204,000
Performing Financing Receivable | Construction Land Development
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	24,316,000		22,904,000
Performing Financing Receivable | Business
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,783,000		1,142,000
Performing Financing Receivable | Consumer
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	7,055,000		9,157,000
Performing Financing Receivable | One-to-four family residential non-owner occupied
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	112,400,000		121,100,000
Performing Financing Receivable | One-to-four family, residential, owner occupied
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	160,300,000		157,300,000
Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,339,000	[2]	3,995,000	[2]
Nonperforming Financing Receivable | One-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	830,000		2,297,000
Nonperforming Financing Receivable | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0		233,000
Nonperforming Financing Receivable | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	434,000		1,198,000
Nonperforming Financing Receivable | Construction Land Development
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0		223,000
Nonperforming Financing Receivable | Business
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0		0
Nonperforming Financing Receivable | Consumer
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	75,000		44,000
Nonperforming Financing Receivable | One-to-four family residential non-owner occupied
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	164,000		817,000
Nonperforming Financing Receivable | One-to-four family, residential, owner occupied
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 666,000		$ 1,500,000

[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmVlNGU3NjI1OTQzNzRmMDRiOTQ2NWJjZTliMjJjZThjfFRleHRTZWxlY3Rpb246QUE1NENFRDVFNTNCNTdERDgwNkQ0MTRCRjA1RDhCNkQM}

[2] Net of LIP.

[3] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmVlNGU3NjI1OTQzNzRmMDRiOTQ2NWJjZTliMjJjZThjfFRleHRTZWxlY3Rpb246NjM4MjlFMkFGNUFGNUNERkI0QzE2RDFGMTMwQzBERTQM}

[4] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmVlNGU3NjI1OTQzNzRmMDRiOTQ2NWJjZTliMjJjZThjfFRleHRTZWxlY3Rpb246QzNFQjA4MkZDMDJCNTYxQjk5NUFGQzMzN0JFNkM3NTMM}