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Condensed Parent Company Information (Condensed Statements of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Interest expense $ (7,607) $ (6,908) $ (8,223)
Net income 27,509 27,034 24,996
Net income available to common shareholders 27,334 26,431 24,128
Parent Company [Member]      
Dividends from wholly-owned subsidiaries 9,000 72,500 9,000
Earnings of wholly-owned subsidiaries, net of dividends 20,517 (43,328) 18,343
Interest expense (1,216) (1,032) (1,007)
All other income and expenses, net (792) (1,106) (1,340)
Net income 27,509 27,034 24,996
Preferred stock dividends (175) (603) (868)
Net income available to common shareholders $ 27,334 $ 26,431 $ 24,128