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Securities - Realized Gain (Loss) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Securities        
Sales $ 81,524 $ 18,126 $ 81,524  
Gross realized gains on securities   17 605  
Gross realized losses on securities   (41) (578)  
Securities (losses) gains, net   (24) 27  
Related tax (expense) benefit   $ 7 $ (8)  
Effective tax rate applied (as a percent)   29.20% 29.60%  
Available-for-sale Securities Pledged as Collateral   $ 320,300   $ 320,800