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Segment Reporting (Business Segment Profit (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]        
Net interest income (expense)   $ 112,615 $ 102,690 $ 95,313
Provision for loan losses   (13,361) (9,638) (7,381)
Noninterest income   34,730 35,760 30,337
Noninterest expense   (90,513) [1] (84,671) (79,393)
Income before income taxes   43,471 44,141 38,876
Income tax (expense) benefit   (9,945) (12,210) (10,539)
Net income   33,526 31,931 28,337
Goodwill impairment $ 1,600 1,575   $ 751
Banking [Member]        
Segment Reporting Information [Line Items]        
Net interest income (expense)   115,086 105,161  
Provision for loan losses   (13,361) (9,638)  
Noninterest income   24,921 26,457  
Noninterest expense   (78,845) [1] (73,056)  
Income before income taxes   47,801 48,924  
Income tax (expense) benefit   (12,253) (14,409)  
Net income   35,548 34,515  
Goodwill impairment      
Non-Banking [Member]        
Segment Reporting Information [Line Items]        
Noninterest income [2]   9,172 8,567  
Noninterest expense [2]   (9,264) [1] (7,080)  
Income before income taxes [2]   (92) 1,487  
Income tax (expense) benefit [2]   491 (584)  
Net income [2]   399 903  
Goodwill impairment   1,575    
Holding Company and Other [Member]        
Segment Reporting Information [Line Items]        
Net interest income (expense)   (2,471) (2,471)  
Noninterest income   637 736  
Noninterest expense   (2,404) [1] (4,535)  
Income before income taxes   (4,238) (6,270)  
Income tax (expense) benefit   1,817 2,783  
Net income   $ (2,421) $ (3,487)  
[1] Non-Banking segment includes SDN reporting unit goodwill impairment of $1.6 million.
[2] Reflects activity from Courier Capital since January 5, 2016 (the date of acquisition) and from the acquisition of the assets of Robshaw & Julian since August 31, 2017 (the date of acquisition).