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Securities - Realized Gain (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Securities      
Sales $ 81,524 $ 2,522  
Gross realized gains on securities 605 35  
Gross realized losses on securities (578)    
Securities (losses) gains, net 27 35  
Related tax (expense) benefit $ (8) $ (10)  
Effective tax rate applied (as a percent) 29.60% 28.60%  
Available-for-sale Securities Pledged as Collateral $ 321,800   $ 318,400