Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016		Dec. 31, 2016
Segment Reporting Information [Line Items]
Net interest income (expense)	$ 30,059		$ 27,379		$ 88,642		$ 81,890
Provision for loan losses	1,300		1,800		2,400		2,750
Net interest income after provision for loan losses	28,759		25,579		86,242		79,140
Noninterest income	17,283		17,261		48,599		47,809
Depreciation and amortization expense	1,107		1,268		3,400		3,703
Other noninterest expenses related to segments	25,647	[1]	23,382	[1]	74,946	[2]	72,427	[2]
Total noninterest expense	26,754		24,650		78,346		76,130
Income before income taxes	19,288		18,190		56,495		50,819
Income tax expense	6,326		5,863		18,552		16,500
Net income	12,962		12,327		37,943		34,319
Total assets	4,469,230		4,204,034		4,469,230		4,204,034		$ 4,381,115
Expenditures for long-lived assets	937		762		2,184		2,608
Goodwill impairment					150		0
Change in fair value of contingent consideration	0		939		310		898
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	24,795		22,860		72,985		67,414
Provision for loan losses	1,300		1,800		2,400		2,750
Net interest income after provision for loan losses	23,495		21,060		70,585		64,664
Noninterest income	6,711		7,101		17,500		17,331
Depreciation and amortization expense	646		709		1,960		2,093
Other noninterest expenses related to segments	15,834	[1]	14,759	[1]	45,764	[2]	43,788	[2]
Total noninterest expense	16,480		15,468		47,724		45,881
Income before income taxes	13,726		12,693		40,361		36,114
Income tax expense	4,463		4,392		13,142		12,336
Net income	9,263		8,301		27,219		23,778
Total assets	3,486,783		3,617,967		3,486,783		3,617,967
Expenditures for long-lived assets	890		424		1,640		1,779
Goodwill impairment					0
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	(48)		(11)		(120)		(46)
Provision for loan losses	0		0		0		0
Net interest income after provision for loan losses	(48)		(11)		(120)		(46)
Noninterest income	10,013		9,623		29,432		28,278
Depreciation and amortization expense	411		501		1,288		1,440
Other noninterest expenses related to segments	6,810	[1]	5,584	[1]	20,106	[2]	19,084	[2]
Total noninterest expense	7,221		6,085		21,394		20,524
Income before income taxes	2,744		3,527		7,918		7,708
Income tax expense	1,092		1,261		3,172		2,788
Net income	1,652		2,266		4,746		4,920
Total assets	63,600		53,236		63,600		53,236
Expenditures for long-lived assets	25		280		368		468
Goodwill impairment					150
Change in fair value of contingent consideration					(310)
Corporate [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	5,312		4,530		15,777		14,522
Provision for loan losses	0		0		0		0
Net interest income after provision for loan losses	5,312		4,530		15,777		14,522
Noninterest income	559		537		1,667		2,200
Depreciation and amortization expense	50		58		152		170
Other noninterest expenses related to segments	3,003	[1]	3,039	[1]	9,076	[2]	9,555	[2]
Total noninterest expense	3,053		3,097		9,228		9,725
Income before income taxes	2,818		1,970		8,216		6,997
Income tax expense	771		210		2,238		1,376
Net income	2,047		1,760		5,978		5,621
Total assets	918,847		532,831		918,847		532,831
Expenditures for long-lived assets	$ 22		$ 58		$ 176		$ 361

[1] Other noninterest expenses for the Wealth Management Services segment includes a $939 thousand benefit resulting from the reduction of a contingent consideration liability in the three months ended September 30, 2016.

[2] ther 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. For the nine months ended September 30, 2016, other noninterest expenses for the Wealth Management Services segment includes a benefit of $898 thousand resulting from the reduction of a contingent consideration liability.