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Segment Reporting (Business Segment Profit (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Net interest income $ 95,313 $ 93,774 $ 91,594
Provision for loan losses (7,381) (7,789) (9,079)
Noninterest income 30,337 25,350 24,833
Noninterest expense (79,393) [1] (72,355) (69,441)
Income before income taxes 38,876 38,980 37,907
Income tax (expense) benefit (10,539) (9,625) (12,377)
Net income 28,337 29,355 $ 25,530
Goodwill impairment 751    
Banking [Member]      
Segment Reporting Information [Line Items]      
Net interest income 97,063 93,774  
Provision for loan losses (7,381) (7,789)  
Noninterest income 24,734 23,602  
Noninterest expense (71,599) [1] (67,857)  
Income before income taxes 42,817 41,730  
Income tax (expense) benefit (12,230) (10,735)  
Net income $ 30,587 30,995  
Goodwill impairment    
Insurance [Member]      
Segment Reporting Information [Line Items]      
Noninterest income [2] $ 4,969 2,073  
Noninterest expense [2] (5,426) [1] (1,877)  
Income before income taxes [2] (457) 196  
Income tax (expense) benefit [2] (121) (9)  
Net income [2] (578) 187  
Goodwill impairment 751    
Holding Company and Other [Member]      
Segment Reporting Information [Line Items]      
Net interest income (1,750)    
Noninterest income 634 (325)  
Noninterest expense (2,368) [1] (2,621)  
Income before income taxes (3,484) (2,946)  
Income tax (expense) benefit 1,812 1,119  
Net income $ (1,672) $ (1,827)  
[1] Insurance segment includes goodwill impairment of $751 thousand
[2] Reflects activity from SDN since August 1, 2014, the date of acquisition.