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Condensed Parent Company Information (Condensed Statements of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Interest expense $ (6,908) $ (8,223) $ (10,985)
Net income 27,034 24,996 20,699
Net income available to common shareholders 26,431 24,128 19,804
Parent Company [Member]      
Dividends from wholly-owned subsidiaries 72,500 9,000 10,500
Earnings of wholly-owned subsidiaries, net of dividends (43,328) 18,343 12,102
Interest expense (1,032) (1,007) (1,025)
All other income and expenses, net (1,106) (1,340) (878)
Net income 27,034 24,996 20,699
Preferred stock dividends (603) (868) (895)
Net income available to common shareholders $ 26,431 $ 24,128 $ 19,804