Loans Receivable: Schedule of Allowance for Loan and Lease Losses, Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       $ 10,491                 $ 10,491          
(Recapture) provision $ 900 $ 700 $ 500 100 $ 1,200 $ 300 $ 100 $ 500 $ 200 $ 0 $ (100) $ 0 2,200 $ 2,100 $ 100      
Loans and Leases Receivable, Allowance, Ending Balance 9,463       10,491               9,463 10,491        
Loans receivable allowance for loan losses 9,463     10,491 10,491               10,491 10,491   $ 9,463 $ 10,491  
One-to-four family residential                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       3,694       5,141       5,562 3,694 5,141 5,562      
Charge-offs                         (27) (78) (456)      
Recoveries                         936 50 1,303      
(Recapture) provision                         (1,575) (1,419) (1,268)      
Loans and Leases Receivable, Allowance, Ending Balance 3,028       3,694       5,141       3,028 3,694 5,141      
Loans receivable allowance for loan losses 3,028     3,694 3,694     5,141 5,141     5,562 3,694 5,141 5,562 3,028 3,694 $ 5,141
Total Loans [1]                               253,772 273,565 280,674
One-to-four family residential | General Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       2,894       3,601         2,894 3,601        
Loans and Leases Receivable, Allowance, Ending Balance 2,516       2,894       3,601       2,516 2,894 3,601      
Loans receivable allowance for loan losses 2,516     2,894 2,894     3,601 3,601       2,894 3,601 3,601 2,516 2,894 3,601
Total Loans [1],[2]                               217,677 229,827 232,526
One-to-four family residential | Specific Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       800       1,540         800 1,540        
Loans and Leases Receivable, Allowance, Ending Balance 512       800       1,540       512 800 1,540      
Loans receivable allowance for loan losses 512     800 800     1,540 1,540       800 1,540 1,540 512 800 1,540
Total Loans [1],[3]                               36,095 43,738 48,148
Multifamily                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       1,646       1,377       1,139 1,646 1,377 1,139      
Charge-offs                         (281) 0 (346)      
Recoveries                         78 0 237      
(Recapture) provision                         (145) 269 347      
Loans and Leases Receivable, Allowance, Ending Balance 1,298       1,646       1,377       1,298 1,646 1,377      
Loans receivable allowance for loan losses 1,298     1,646 1,646     1,377 1,377     1,139 1,646 1,377 1,139 1,298 1,646 1,377
Total Loans [1]                               133,388 120,271 117,181
Multifamily | General Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       1,619       1,292         1,619 1,292        
Loans and Leases Receivable, Allowance, Ending Balance 1,295       1,619       1,292       1,295 1,619 1,292      
Loans receivable allowance for loan losses 1,295     1,619 1,619     1,292 1,292       1,619 1,292 1,292 1,295 1,619 1,292
Total Loans [1],[2]                               131,793 118,099 114,740
Multifamily | Specific Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       27       85         27 85        
Loans and Leases Receivable, Allowance, Ending Balance 3       27       85       3 27 85      
Loans receivable allowance for loan losses 3     27 27     85 85       27 85 85 3 27 85
Total Loans [1],[3]                               1,595 2,172 2,441
Commercial Real Estate                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       4,597       5,881       5,207 4,597 5,881 5,207      
Charge-offs                         0 (311) (98)      
Recoveries                         181 174 7      
(Recapture) provision                         (1,236) (1,147) 765      
Loans and Leases Receivable, Allowance, Ending Balance 3,542       4,597       5,881       3,542 4,597 5,881      
Loans receivable allowance for loan losses 3,542     4,597 4,597     5,881 5,881     5,207 4,597 5,881 5,207 3,542 4,597 5,881
Total Loans [1]                               252,501 247,968 247,402
Commercial Real Estate | General Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       4,268       5,326         4,268 5,326        
Loans and Leases Receivable, Allowance, Ending Balance 3,364       4,268       5,326       3,364 4,268 5,326      
Loans receivable allowance for loan losses 3,364     4,268 4,268     5,326 5,326       4,268 5,326 5,326 3,364 4,268 5,326
Total Loans [1],[2]                               247,110 238,416 234,093
Commercial Real Estate | Specific Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       329       555         329 555        
Loans and Leases Receivable, Allowance, Ending Balance 178       329       555       178 329 555      
Loans receivable allowance for loan losses 178     329 329     555 555       329 555 555 178 329 555
Total Loans [1],[3]                               5,391 9,552 13,309
Construction Land Development                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       355       399       437 355 399 437      
Charge-offs                         0 (223) (582)      
Recoveries                         0 0 455      
(Recapture) provision                         586 179 89      
Loans and Leases Receivable, Allowance, Ending Balance 941       355       399       941 355 399      
Loans receivable allowance for loan losses 941     355 355     399 399     437 355 399 437 941 355 399
Total Loans [1]                               43,172 24,316 23,127
Construction Land Development | General Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       355       399         355 399        
Loans and Leases Receivable, Allowance, Ending Balance 941       355       399       941 355 399      
Loans receivable allowance for loan losses 941     355 355     399 399       355 399 399 941 355 399
Total Loans [1],[2]                               43,172 24,316 22,904
Construction Land Development | Specific Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       0       0         0 0        
Loans and Leases Receivable, Allowance, Ending Balance 0       0       0       0 0 0      
Loans receivable allowance for loan losses 0     0 0     0 0       0 0 0 0 0 0
Total Loans [1],[3]                               0 0 223
Business                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       47       14       30 47 14 30      
Charge-offs                         0 0 (13)      
Recoveries                         3 10 0      
(Recapture) provision                         179 23 (3)      
Loans and Leases Receivable, Allowance, Ending Balance 229       47       14       229 47 14      
Loans receivable allowance for loan losses 229     47 47     14 14     30 47 14 30 229 47 14
Total Loans [1]                               7,604 3,783 1,142
Business | General Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       47       14         47 14        
Loans and Leases Receivable, Allowance, Ending Balance 229       47       14       229 47 14      
Loans receivable allowance for loan losses 229     47 47     14 14       47 14 14 229 47 14
Total Loans [1],[2]                               7,604 3,783 1,142
Business | Specific Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       0       0         0 0        
Loans and Leases Receivable, Allowance, Ending Balance 0       0       0       0 0 0      
Loans receivable allowance for loan losses 0     0 0     0 0       0 0 0 0 0 0
Total Loans [1],[3]                               0 0 0
Consumer                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       152       182       167 152 182 167      
Charge-offs                         (54) (30) (101)      
Recoveries                         336 5 146      
(Recapture) provision                         (9) (5) (30)      
Loans and Leases Receivable, Allowance, Ending Balance 425       152       182       425 152 182      
Loans receivable allowance for loan losses 425     152 152     182 182     167 152 182 167 425 152 182
Total Loans [1]                               6,979 7,130 9,201
Consumer | General Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       93       182         93 182        
Loans and Leases Receivable, Allowance, Ending Balance 386       93       182       386 93 182      
Loans receivable allowance for loan losses 386     93 93     182 182       93 182 182 386 93 182
Total Loans [1],[2]                               6,771 6,933 9,157
Consumer | Specific Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       59       0         59 0        
Loans and Leases Receivable, Allowance, Ending Balance 39       59       0       39 59 0      
Loans receivable allowance for loan losses 39     59 59     0 0       59 0 0 39 59 0
Total Loans [1],[3]                               208 197 44
Property total                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       10,491       12,994       (12,542) 10,491 12,994 (12,542)      
Charge-offs                         (362) (642) 1,596      
Recoveries                         1,534 239 2,148      
(Recapture) provision                         (2,200) (2,100) 100      
Loans and Leases Receivable, Allowance, Ending Balance 9,463       10,491       12,994       9,463 10,491 12,994      
Loans receivable allowance for loan losses 9,463     10,491 10,491     12,994 12,994     $ (12,542) 10,491 12,994 (12,542) 9,463 10,491 12,994
Total Loans [1]                               697,416 677,033 678,727
Property total | General Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       9,276       10,814         9,276 10,814        
Loans and Leases Receivable, Allowance, Ending Balance 8,731       9,276       10,814       8,731 9,276 10,814      
Loans receivable allowance for loan losses 8,731     9,276 9,276     10,814 10,814       9,276 10,814 10,814 8,731 9,276 10,814
Total Loans [1],[2]                               654,127 621,374 614,562
Property total | Specific Reserve                                    
Allowance for Loan and Lease Losses [Roll Forward]                                    
Loans and Leases Receivable, Allowance, Beginning Balance       1,215       2,180 [1]         1,215 2,180 [1]        
Loans and Leases Receivable, Allowance, Ending Balance 732       1,215       2,180 [1]       732 1,215 2,180 [1]      
Loans receivable allowance for loan losses $ 732     $ 1,215 $ 1,215     $ 2,180 [1] $ 2,180 [1]       $ 1,215 $ 2,180 [1] $ 2,180 [1] 732 1,215 2,180 [1]
Total Loans [1],[3]                               $ 43,289 $ 55,659 $ 64,165
[1] Net of LIP.
[2] Loans collectively evaluated for impairment.
[3] Loans individually evaluated for impairment