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Securities - Realized Gain (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Securities          
Sales   $ 57,228 $ 18,006 $ 177,824  
Gross realized gains on securities   3,841 17 5,432  
Gross realized losses on securities $ (1) (378) (42) (956)  
Securities (losses) gains, net $ (1) 3,463 (25) 4,476  
Related tax (expense) benefit   $ (973) $ 7 $ (1,257)  
Effective tax rate applied (as a percent) 0.00% 28.10% 28.00% 28.10%  
Available-for-sale Securities Pledged as Collateral $ 353,200   $ 353,200   $ 320,800