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Securities, Gains and Losses Realized on Sale of Securities Available for Sale (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Gain and losses realized on sale of securities available for sale [Abstract]    
Proceeds $ 36,593 $ 44,305
Realized gains 253 169
Realized losses $ 0 32
Trading securities, realized gain (loss)   $ 167