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Securities - Realized Gain (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Securities      
Sales $ 2,522 $ 64,388  
Gross realized gains on securities 35 366  
Gross realized losses on securities   (502)  
Securities (losses) gains, net 35 (136)  
Income tax (expense) benefit on net realized gains (losses) 10 $ (54)  
Available-for-sale Securities Pledged as Collateral $ 286,300   $ 301,000