Segment Reporting (Business Segment Profit (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net interest income (expense)	$ 32,483			$ 30,903			$ 96,739	$ 90,835
Provision for loan losses	(1,844)			(2,061)			(5,391)	(5,050)
Noninterest income	12,361			9,816			30,714	27,130
Noninterest expense	(25,886)			(25,521)			(76,060)	(73,073)
Income before income taxes	17,114			13,137			46,002	39,842
Income tax (expense) benefit	(4,281)			(2,560)			(10,247)	(7,807)
Net income	12,833	$ 11,401	$ 11,521	10,577	$ 12,170	$ 9,288	35,755	32,035
Operating Segment [Member] | Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	33,101			31,520			98,592	92,688
Provision for loan losses	(1,844)			(2,061)			(5,391)	(5,050)
Noninterest income	9,398			6,867			22,452	19,453
Noninterest expense	(22,153)			(22,050)			(65,256)	(62,710)
Income before income taxes	18,502			14,276			50,397	44,381
Income tax (expense) benefit	(4,034)			(2,797)			(10,693)	(8,933)
Net income	14,468			11,479			39,704	35,448
Operating Segment [Member] | Non-Banking [Member]
Segment Reporting Information [Line Items]
Noninterest income	3,149			3,118			8,809	8,127
Noninterest expense	(3,225)			(2,832)			(9,097)	(7,647)
Income before income taxes	(76)			286			(288)	480
Income tax (expense) benefit	16			(76)			59	(127)
Net income	(60)			210			(229)	353
Holding Company and Other [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	(618)			(617)			(1,853)	(1,853)
Noninterest income	(186)			(169)			(547)	(450)
Noninterest expense	(508)			(639)			(1,707)	(2,716)
Income before income taxes	(1,312)			(1,425)			(4,107)	(5,019)
Income tax (expense) benefit	(263)			313			387	1,253
Net income	$ (1,575)			$ (1,112)			$ (3,720)	$ (3,766)