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Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]        
Current - Federal   $ 19,188 $ 11,286 $ 12,827
- State   3,187 1,996 1,679
Deferred - Federal   1,658 7,742 16
- State   156 743 102
Income tax expense (benefit) $ 1,300 $ 24,189 $ 21,767 $ 14,624