Loans Receivable: Schedule of Impaired Financing Receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
One-to-four family, residential, owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] $ 2,216 $ 3,169
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance [2] 2,475 3,441
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 1,896 2,120
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance [2] 1,965 2,189
Impaired Financing Receivable, Related Allowance 51 85
Impaired Financing Receivable, Recorded Investment [1] 4,112 5,289
Impaired Financing Receivable, Unpaid Principal Balance [2] 4,440 5,630
One-to-four family residential non-owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 16,634 23,285
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance [2] 16,652 23,310
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 4,326 7,521
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance [2] 4,347 7,573
Impaired Financing Receivable, Related Allowance 151 427
Impaired Financing Receivable, Recorded Investment [1] 20,960 30,806
Impaired Financing Receivable, Unpaid Principal Balance [2] 20,999 30,883
Multifamily    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 1,564 415
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance [2] 1,564 414
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 1,180
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance [2] 0 1,180
Impaired Financing Receivable, Related Allowance 0 3
Impaired Financing Receivable, Recorded Investment [1] 1,564 1,595
Impaired Financing Receivable, Unpaid Principal Balance [2] 1,564 1,594
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 2,952 2,675
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance [2] 3,029 2,857
Impaired Financing Receivable, with Related Allowance, Recorded Investment 755 2,221 [1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 755 2,222 [2]
Impaired Financing Receivable, Related Allowance 26 125
Impaired Financing Receivable, Recorded Investment [1] 3,707 4,896
Impaired Financing Receivable, Unpaid Principal Balance [2] 3,784 5,079
Consumer Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1]   76
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance [2]   76
Impaired Financing Receivable, Related Allowance   39
Consumer    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0  
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0  
Impaired Financing Receivable, Related Allowance 0  
Construction Land Development    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance [2] 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 495 495
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 495 495
Impaired Financing Receivable, Related Allowance 81 53
Impaired Financing Receivable, Recorded Investment [1] 495 495
Impaired Financing Receivable, Unpaid Principal Balance [2] 495 495
Consumer    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 103 132
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance [2] 223 183
Impaired Financing Receivable, Related Allowance   39
Impaired Financing Receivable, Recorded Investment [1] 103 208
Impaired Financing Receivable, Unpaid Principal Balance [2] 223 259
Property total    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 23,469 29,676
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance [2] 23,943 30,205
Impaired Financing Receivable, with Related Allowance, Recorded Investment 7,472 13,613 [1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 7,562 13,735 [2]
Impaired Financing Receivable, Related Allowance 309 732
Impaired Financing Receivable, Recorded Investment [1] 30,941 43,289
Impaired Financing Receivable, Unpaid Principal Balance [2] $ 31,505 $ 43,940
[1] (1) Represents the loan balance less charge-offs.
[2] (2) Contractual loan principal balance.