Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016		Dec. 31, 2016
Segment Reporting Information [Line Items]
Net interest income (expense)	$ 29,904		$ 26,776		$ 58,583		$ 54,511
Provision for loan losses	700		450		1,100		950
Net interest income after provision for loan losses	29,204		26,326		57,483		53,561
Noninterest income	16,806		15,914		31,316		30,548
Depreciation and amortization expense	1,115		1,224		2,293		2,435
Other noninterest expenses related to segments	25,191	[1]	24,806	[1]	49,299	[2]	49,045	[2]
Total noninterest expense	26,306		26,030		51,592		51,480
Income before income taxes	19,704		16,210		37,207		32,629
Income tax expense	6,505		5,153		12,226		10,637
Net income	13,199		11,057		24,981		21,992
Total assets	4,375,529		3,917,081		4,375,529		3,917,081		$ 4,381,115
Expenditures for long-lived assets	514		639		1,247		1,816
Goodwill impairment					150		0
Change in fair value of contingent consideration	0		(16)		310		(41)
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	24,633		21,947		48,190		44,554
Provision for loan losses	700		450		1,100		950
Net interest income after provision for loan losses	23,933		21,497		47,090		43,604
Noninterest income	6,347		5,290		10,789		10,230
Depreciation and amortization expense	651		697		1,314		1,384
Other noninterest expenses related to segments	15,323	[1]	15,038	[1]	29,930	[2]	29,029	[2]
Total noninterest expense	15,974		15,735		31,244		30,413
Income before income taxes	14,306		11,052		26,635		23,421
Income tax expense	4,650		3,767		8,679		8,022
Net income	9,656		7,285		17,956		15,399
Total assets	3,346,184		3,238,789		3,346,184		3,238,789
Expenditures for long-lived assets	377		306		750		1,325
Goodwill impairment					0
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	(40)		(17)		(72)		(35)
Provision for loan losses	0		0		0		0
Net interest income after provision for loan losses	(40)		(17)		(72)		(35)
Noninterest income	9,942		9,481		19,419		18,655
Depreciation and amortization expense	414		470		877		939
Other noninterest expenses related to segments	6,848	[1]	6,701	[1]	13,296	[2]	13,500	[2]
Total noninterest expense	7,262		7,171		14,173		14,439
Income before income taxes	2,640		2,293		5,174		4,181
Income tax expense	1,102		871		2,080		1,604
Net income	1,538		1,422		3,094		2,577
Total assets	66,286		65,423		66,286		65,423
Expenditures for long-lived assets	41		104		343		188
Goodwill impairment	150				150
Change in fair value of contingent consideration					(310)
Corporate [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	5,311		4,846		10,465		9,992
Provision for loan losses	0		0		0		0
Net interest income after provision for loan losses	5,311		4,846		10,465		9,992
Noninterest income	517		1,143		1,108		1,663
Depreciation and amortization expense	50		57		102		112
Other noninterest expenses related to segments	3,020	[1]	3,067	[1]	6,073	[2]	6,516	[2]
Total noninterest expense	3,070		3,124		6,175		6,628
Income before income taxes	2,758		2,865		5,398		5,027
Income tax expense	753		515		1,467		1,011
Net income	2,005		2,350		3,931		4,016
Total assets	963,059		612,869		963,059		612,869
Expenditures for long-lived assets	$ 96		$ 229		$ 154		$ 303

[1] Other noninterest expenses for the Wealth Management Services segment includes a $150 thousand goodwill impairment charge recognized in the three months ended June 30, 2017.

[2] Other noninterest expenses for the Wealth Management Services segment includes a $310 thousand benefit resulting from the reduction of a contingent consideration liability and a $150 thousand goodwill impairment charge recognized in the six months ended June 30, 2017.