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Segment Reporting (Business Segment Profit (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Net interest income (expense) $ 29,628 $ 26,995
Provision for loan losses (2,949) (2,781)
Noninterest income 8,984 7,836
Noninterest expense (24,107) (20,942)
Income before income taxes 11,556 11,108
Income tax expense (benefit) 2,268 3,165
Net income 9,288 7,943
Banking [Member]    
Segment Reporting Information [Line Items]    
Net interest income (expense) 30,246 27,613
Provision for loan losses (2,949) (2,781)
Noninterest income 6,504 5,578
Noninterest expense (20,483) (18,484)
Income before income taxes 13,318 11,926
Income tax expense (benefit) 2,632 3,573
Net income 10,686 8,353
Non-Banking [Member]    
Segment Reporting Information [Line Items]    
Noninterest income 2,624 2,405
Noninterest expense (2,665) (1,834)
Income before income taxes (41) 571
Income tax expense (benefit) (8) 222
Net income (33) 349
Holding Company and Other [Member]    
Segment Reporting Information [Line Items]    
Net interest income (expense) (618) (618)
Noninterest income (144) (147)
Noninterest expense (959) (624)
Income before income taxes (1,721) (1,389)
Income tax expense (benefit) (356) (630)
Net income $ (1,365) $ (759)