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AFS Securities (Activity related to sales of AFS securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales of AFS of securities $ 0 $ 33,840 $ 26,855 $ 33,840
Gross realized gains (losses) 0 6 71 6
Applicable income tax expense $ 0 $ 1 $ 15 $ 1