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Securities - Realized Gain (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Securities      
Sales $ 18,006 $ 191,298 $ 94,663
Gross realized gains on securities 17 5,521 369
Gross realized losses on securities (42) (1,010) (9)
Securities (losses) gains, net (25) 4,511 360
Related tax (expense) benefit $ 7 $ (1,267) $ (100)
Effective tax rate applied (as a percent) 28.00% 28.10% 27.80%
Available-for-sale Securities Pledged as Collateral $ 335,800 $ 320,800 $ 320,800