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Condensed Parent Company Information (Condensed Statements of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest expense $ (23,777) $ (12,671) $ (7,607)
Net income 89,289 45,972 27,509
Preferred stock dividends (175)
Net income available to common shareholders 89,289 45,972 27,334
Parent Company [Member]      
Dividends from wholly-owned subsidiaries 15,525 52,732 9,000
Earnings of wholly-owned subsidiaries, net of dividends 77,050 (4,793) 20,517
Interest expense (2,498) (1,867) (1,216)
All other income and expenses, net (788) (100) (792)
Net income 89,289 45,972 27,509
Preferred stock dividends (175)
Net income available to common shareholders $ 89,289 $ 45,972 $ 27,334