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Segment Reporting (Business Segment Profit (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net interest income (expense)	$ 122,864	$ 112,615	$ 102,690
Provision for loan losses	(8,934)	(13,361)	(9,638)
Noninterest income	36,478	34,730	35,760
Noninterest expense	(100,876)	(90,513)	(84,671)
Income before income taxes	49,532	43,471	44,141
Income tax (expense) benefit	(10,006)	(9,945)	(12,210)
Net income	39,526	33,526	31,931
Banking Segment [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	125,334	115,086	105,161
Provision for loan losses	(8,934)	(13,361)	(9,638)
Noninterest income	26,295	24,921	26,457
Noninterest expense	(84,927)	(78,845)	(73,056)
Income before income taxes	57,768	47,801	48,924
Income tax (expense) benefit	(11,622)	(12,253)	(14,409)
Net income	46,146	35,548	34,515
Non-Banking [Member]
Segment Reporting Information [Line Items]
Noninterest income	10,780	9,172	8,567
Noninterest expense	(12,663)	(9,264)	(7,080)
Income before income taxes	(1,883)	(92)	1,487
Income tax (expense) benefit	(129)	491	(584)
Net income	(2,012)	399	903
Holding Company and Other [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	(2,470)	(2,471)	(2,471)
Noninterest income	(597)	637	736
Noninterest expense	(3,286)	(2,404)	(4,535)
Income before income taxes	(6,353)	(4,238)	(6,270)
Income tax (expense) benefit	1,745	1,817	2,783
Net income	$ (4,608)	$ (2,421)	$ (3,487)

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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