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Securities - Realized Gain (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Securities          
Sales $ 57,228 $ 1,917 $ 177,824 $ 94,663  
Gross realized gains on securities 3,841 23 5,432 370  
Gross realized losses on securities (378) (10) (956) (10)  
Securities (losses) gains, net 3,463 13 4,476 360  
Related tax (expense) benefit $ (973) $ (3) $ (1,257) $ (100)  
Effective tax rate applied (as a percent) 28.10% 23.10% 28.10% 27.80%  
Available-for-sale Securities Pledged as Collateral $ 328,800   $ 328,800   $ 311,200