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Investment Securities (Unrealized and realized gains and losses recognized in net income on equity securities ) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Investment Securities    
Equity Securities $ 6,095,000 $ 5,937,000
Summary of unrealized and realized gains and losses recognized in net income on equity securities    
Net gains (losses) recognized during the period on equity securities 158,000 (388,000)
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date $ 158,000 $ (388,000)