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Segment Reporting (Business Segment Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Net interest income $ 23,404 $ 23,103 $ 46,551 $ 46,378
Provision for loan losses (1,288) (1,758) (4,029) (3,864)
Noninterest income 6,455 6,577 14,752 12,934
Noninterest expense (19,236) (17,808) (38,247) (35,021)
Income before income taxes 9,335 10,114 19,027 20,427
Income tax (expense) benefit (2,750) (3,082) (5,641) (6,176)
Net income 6,585 $ 7,032 13,386 $ 14,251
Banking [Member]        
Segment Reporting Information [Line Items]        
Net interest income 23,919   47,066  
Provision for loan losses (1,288)   (4,029)  
Noninterest income 5,522   12,353  
Noninterest expense (17,668)   (34,947)  
Income before income taxes 10,485   20,443  
Income tax (expense) benefit (3,107)   (6,056)  
Net income 7,378   14,387  
Insurance [Member]        
Segment Reporting Information [Line Items]        
Noninterest income 1,033   2,626  
Noninterest expense (1,050)   (2,237)  
Income before income taxes (17)   389  
Income tax (expense) benefit 5   (154)  
Net income (12)   235  
Holding Company and Other [Member]        
Segment Reporting Information [Line Items]        
Net interest income (515)   (515)  
Noninterest income (100)   (227)  
Noninterest expense (518)   (1,063)  
Income before income taxes (1,133)   (1,805)  
Income tax (expense) benefit 352   569  
Net income $ (781)   $ (1,236)