Loans Receivable: Narratives (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans Receivable, Percentage of Loan Portfolio 13.50%      
Loans and Leases Receivable, Net Amount $ 685,072,000 $ 663,938,000    
Loans Receivable, non-performing 1,100,000 1,300,000    
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 103,000 126,000 $ 650,000  
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0 0    
Troubled debt restructuring, charge to Allowance for Loan and Lease Losses       $ 0
One-to-four family residential        
Loans Receivable, Percentage of Loan Portfolio 33.80%      
Loans and Leases Receivable, Net Amount $ 13,500,000      
Multifamily        
Loans Receivable, Percentage of Loan Portfolio 19.10%      
Loans and Leases Receivable, Net Amount $ 2,000,000      
Commercial Real Estate        
Loans Receivable, Percentage of Loan Portfolio 33.60%      
Loans and Leases Receivable, Net Amount $ 59,900,000      
Construction Land Development        
Loans and Leases Receivable, Net Amount 438,000      
Consumer Loan [Member]        
Loans and Leases Receivable, Net Amount 198,000      
Commercial Real Estate Construction        
Loans excluded from category   $ 6,100,000    
Loans and Notes receivable, category as percent of total   2.50%    
Multifamily Construction        
Loans excluded from category $ 21,100,000 $ 4,500,000    
Loans and Notes receivable, category as percent of total 14.70% 3.70%    
Construction Land Development Commercial        
Loans excluded from category $ 8,300,000 $ 3,000,000