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Available for Sale Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Securities [Abstract]      
Fair value of securities pledged as collateral, to secure public deposits and for other purposes $ 37,900 $ 34,800  
Fair value of securities delivered for repurchase agreements   19,500 $ 24,800
Total fair value of investments $ 3,100 $ 38,800  
Fair value as a percentage of available-for-sale investment portfolio 3.00% 38.00%  
Total unrealized loss on securities portfolio $ 10 $ 200