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Securities Securities (Sales of Securities Held to Maturity) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]      
Proceeds from sales $ 0 $ 0 $ 136,719
Amortized cost 0 0 132,974
Gross realized gains 0 0 3,770
Gross realized losses 0 0 (25)
Tax expense related to security gains/losses $ 0 $ 0 $ (1,311)