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Securities - Realized Gain (Loss) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Securities      
Sales $ 232,462,000.000 $ 306,400,000.000 $ 70,176,000.000
Gross realized gains on securities 2,367,000.000 1,675,000.000 106,000.000
Gross realized losses on securities (1,893,000.000) (3,888,000.000) (284,000.000)
Securities (losses) gains, net 474,000.000 (2,213,000.000) (178,000.000)
Income tax benefit (expense) on net realized gains $ (198,000) $ 882,000 $ 71,000