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Loans Receivable: Narratives (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans $ 2,000 $ 3,000 $ 9,000 $ 7,000  
Loans and Leases Receivable, Ratio of Nonperforming Loans to All Loans 0.02%   0.02%   0.08%
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 0   $ 0   $ 0
Troubled Debt Restructuring Loans 6,700,000   6,700,000   $ 9,400,000
Troubled Debt Restructuring Commitment To Extend Additional Credit 0 $ 0 0 $ 0  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default $ 0   0    
Troubled debt restructuring, charge to Allowance for Loan and Lease Losses     0    
Minimum          
Troubled Debt Restructuring, Interest Rate Concession Period 1 year 1 year     1 year
Maximum          
Troubled Debt Restructuring, Interest Rate Concession Period 3 years 3 years     3 years
FHLB of Des Moines [Member]          
Loans Pledged as Collateral $ 495,300,000   495,300,000   $ 471,400,000
Federal Reserve Bank [Member]          
Loans Pledged as Collateral $ 92,100,000   $ 92,100,000   $ 91,200,000