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Business Segments (Business Segment Information) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Net interest income $ 23,258 $ 22,803 $ 69,636 $ 68,214
Provision for loan losses (2,015) (2,770) (5,879) (6,672)
Noninterest income 7,261 6,169 20,195 19,098
Noninterest expense (17,955) (17,009) (52,976) (52,055)
Income before income taxes 10,549 9,193 30,976 28,585
Income tax (expense) benefit (3,365) (3,029) (9,541) (9,422)
Net income 7,184 6,164 21,435 19,163
Banking [Member]
        
Segment Reporting Information [Line Items]        
Net interest income 23,258   69,636  
Provision for loan losses (2,015)   (5,879)  
Noninterest income 6,684   19,779  
Noninterest expense (16,794)   (50,315)  
Income before income taxes 11,133   33,221  
Income tax (expense) benefit (3,584)   (10,480)  
Net income 7,549   22,741  
Insurance [Member]
        
Segment Reporting Information [Line Items]        
Noninterest income 670 [1]   670 [1]  
Noninterest expense (640) [1]   (640) [1]  
Income before income taxes 30 [1]   30 [1]  
Income tax (expense) benefit (12) [1]   (12) [1]  
Net income 18 [1]   18 [1]  
Holding Company and Other [Member]
        
Segment Reporting Information [Line Items]        
Noninterest income (93)   (254)  
Noninterest expense (521)   (2,021)  
Income before income taxes (614)   (2,275)  
Income tax (expense) benefit 231   951  
Net income $ (383)   $ (1,324)  
[1] Reflects activity from SDN since August 1, 2014, the date of acquisition.