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Condensed Parent Company Information (Condensed Statements of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest expense $ (12,671) $ (7,607) $ (6,908)
Net income 45,972 27,509 27,034
Preferred stock dividends (175) (603)
Net income available to common shareholders 45,972 27,334 26,431
Parent Company [Member]      
Dividends from wholly-owned subsidiaries 52,732 9,000 72,500
Earnings of wholly-owned subsidiaries, net of dividends (4,793) 20,517 (43,328)
Interest expense (1,867) (1,216) (1,032)
All other income and expenses, net (100) (792) (1,106)
Net income 45,972 27,509 27,034
Preferred stock dividends (175) (603)
Net income available to common shareholders $ 45,972 $ 27,334 $ 26,431