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Segment Reporting (Business Segment Profit (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Net interest income (expense) $ 30,821 $ 28,438 $ 90,534 $ 82,855
Provision for loan losses (2,061) (2,802) (5,050) (9,415)
Noninterest income 9,898 8,574 27,431 25,743
Noninterest expense (25,521) (22,467) (73,073) (67,350)
Income before income taxes 13,137 11,743 39,842 31,833
Income tax (expense) benefit (2,560) (3,464) (7,807) (9,365)
Net income 10,577 8,279 32,035 22,468
Banking [Member]        
Segment Reporting Information [Line Items]        
Net interest income (expense) 31,438 29,056 92,387 84,708
Provision for loan losses (2,061) (2,802) (5,050) (9,415)
Noninterest income 6,949 6,410 19,754 18,203
Noninterest expense (22,050) (19,939) (62,710) (58,263)
Income before income taxes 14,276 12,725 44,381 35,233
Income tax (expense) benefit (2,797) (3,923) (8,933) (10,544)
Net income 11,479 8,802 35,448 24,689
Non-Banking [Member]        
Segment Reporting Information [Line Items]        
Noninterest income 3,118 2,315 8,127 6,760
Noninterest expense (2,832) (1,947) (7,647) (7,209)
Income before income taxes 286 368 480 (449)
Income tax (expense) benefit (76) (144) (127) (440)
Net income 210 224 353 (889)
Holding Company and Other [Member]        
Segment Reporting Information [Line Items]        
Net interest income (expense) (617) (618) (1,853) (1,853)
Noninterest income (169) (151) (450) 780
Noninterest expense (639) (581) (2,716) (1,878)
Income before income taxes (1,425) (1,350) (5,019) (2,951)
Income tax (expense) benefit 313 603 1,253 1,619
Net income $ (1,112) $ (747) $ (3,766) $ (1,332)