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Securities Securities (Summary of Gross Realized Gains and Gross Realized Losses (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 Sale of Debt Securities, Available-for-sale $ 0 $ 0 $ 194,105 $ 259,554
Gross Realized Gains from sales of debt securities available for sale 0 0 435 3,357
Gross Realized Losses from sales of debt securities available for sale 0 0 (186) (1,225)
Other securities gains 0 0 16,425 0
Investment securities gain (loss), net $ 0 $ 0 $ 16,674 $ 2,132