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Borrowings - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 22, 2013
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]                          
Ratio of line of credit to eligible assets   45.00%                 45.00%    
Line of credit   $ 139,300,000.0                 $ 139,300,000.0    
Ratio of line of credit to total assets   10.00%                 10.00%    
Ratio of eligible assets to borrowing capacity   45.00%                 45.00%    
Additional borrowing capacity   $ 667,800,000                 $ 667,800,000    
Long-term FHLB advances   7,200,000       $ 7,400,000         7,200,000 $ 7,400,000  
Term of FHLB advances 18 years           20 years     20 years      
Repayment term of FHLB advance 30 years           30 years     30 years      
Fixed rate of FHLB advance 3.12%           3.25%     2.61%      
Loans pledged as collateral   0       0         0 0  
FHLB discount window advances outstanding   0       0         0 0  
Interest paid (less than)                     $ 2,971,000 2,470,000 $ 2,553,000
Alaska limit on borrowing, percent of total assets                     15.00%    
Alaska limit on borrowing, total assets   222,600,000       225,800,000         $ 222,600,000 225,800,000  
Securities sold under agreements to repurchase   $ 34,278,000       $ 27,746,000         $ 34,278,000 $ 27,746,000  
Percentage paid on securities sold under agreements to repurchase   0.17%       0.14%         0.17% 0.14%  
Average balance outstanding   $ 29,900,000       $ 29,000,000         $ 29,900,000 $ 29,000,000  
Maximum amount outstanding at any month end                     36,500,000 32,600,000  
Interest expense on deposits, borrowings and junior subordinated debentures   $ 1,070,000 $ 761,000 $ 606,000 $ 532,000 $ 548,000 $ 602,000 $ 648,000 $ 632,000   $ 2,969,000 $ 2,430,000 $ 2,561,000
Weighted average interest rate   3.39%       3.23%         3.39% 3.23% 2.82%
FHLB Community Investment Program Advance                          
Debt Instrument [Line Items]                          
Face amount $ 2,200,000                        
FHLB Community Investment Cash Advance Program                          
Debt Instrument [Line Items]                          
Face amount             $ 3,100,000     $ 2,300,000      
Note Agreement With Federal Reserve Bank                          
Debt Instrument [Line Items]                          
Loans pledged as collateral   $ 78,600,000                 $ 78,600,000    
Interest paid (less than)                     1,000 $ 1,000  
Discount Window                          
Debt Instrument [Line Items]                          
Loans pledged as collateral   $ 48,900,000                 48,900,000    
FHLB and Secured Debt                          
Debt Instrument [Line Items]                          
Interest expense on deposits, borrowings and junior subordinated debentures                     $ 273,000 $ 207,000 $ 157,000