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Securities - Realized Gain (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Securities      
Sales $ 191,298 $ 94,663 $ 232,462
Gross realized gains on securities 5,521 369 2,367
Gross realized losses on securities (1,010) (9) (1,893)
Securities (losses) gains, net 4,511 360 474
Related tax (expense) benefit $ (1,267) $ (100) $ (198)
Effective tax rate applied (as a percent) 28.10% 27.80% 41.80%
Available-for-sale Securities Pledged as Collateral $ 320,800 $ 318,400