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Investment Securities (Sales of Securities Available for Sale) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Investments [Abstract]        
Proceeds from sales $ 29,896 $ 39,667 $ 50,153 $ 44,615
Gross realized gains $ 674 203 904 203
Gross realized losses   $ 37 $ 9 $ 90