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Investments: Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
securities
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
securities
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
securities
Debt Securities, Available-for-sale [Line Items]          
Investments pledged as collateral for FHLB advances 50.00%   50.00%    
Investments pledged as collateral for public deposits $ 15,800,000   $ 15,800,000   $ 15,600,000
Principal repayments on investments available-for-sale 0 $ 7,800,000 3,000,000 $ 9,800,000  
Net gain (loss) on sale of investments $ 0 $ 21,000 $ 8,000 21,000  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities 22   22   31
Unrealized Loss | securities 30   30   51
Payments to Acquire Marketable Securities     $ 3,012,000 $ 22,107,000