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Debt Securities Available for Sale - Realized gains and losses on debt securities available-for-sale (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures      
Gross Realized Gains $ 0 $ 0 $ 95,000
Gross Realized Losses (20,000) 0 (12,000)
Debt Securities, Available-for-sale, Realized Gain (Loss), Total $ (20,000) $ 0 $ 83,000