Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net interest income	$ 24,938	$ 23,388	$ 73,242	$ 68,264
Noninterest income	13,125	17,400	45,309	46,960
Net interest income after provision for loan losses	24,338	22,688	71,892	66,264
Provision for loan losses	600	700	1,350	2,000
Depreciation and amortization	947	982	2,839	3,005
Other noninterest expenses related to segments	21,100	24,566	70,948	71,732
Total noninterest expense	22,047	25,548	73,787	74,737
Income before income taxes	15,416	14,540	43,414	38,487
Income tax expense	4,878	4,580	13,781	12,123
Net income	10,538	9,960	29,633	26,364
Total assets	3,415,882	3,131,958	3,415,882	3,131,958	3,188,867
Expenditures for long-lived assets	634	341	3,315	1,178
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	19,965	20,364	59,503	59,606
Noninterest income	4,370	8,302	12,771	24,239
Net interest income after provision for loan losses	19,365	19,664	58,153	57,606
Provision for loan losses	600	700	1,350	2,000
Depreciation and amortization	627	614	1,833	1,876
Other noninterest expenses related to segments	12,793	15,840	39,565	47,244
Total noninterest expense	13,420	16,454	41,398	49,120
Income before income taxes	10,315	11,512	29,526	32,725
Income tax expense	3,401	3,875	9,764	11,421
Net income	6,914	7,637	19,762	21,304
Total assets	2,792,759	2,460,150	2,792,759	2,460,150
Expenditures for long-lived assets	327	277	2,710	1,014
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income	(8)	(4)	(19)	5
Noninterest income	8,374	7,629	24,969	23,015
Net interest income after provision for loan losses	(8)	(4)	(19)	5
Provision for loan losses	0	0	0	0
Depreciation and amortization	269	316	852	968
Other noninterest expenses related to segments	5,620	4,944	16,489	15,078
Total noninterest expense	5,889	5,260	17,341	16,046
Income before income taxes	2,477	2,365	7,609	6,974
Income tax expense	942	876	2,836	2,635
Net income	1,535	1,489	4,773	4,339
Total assets	51,012	50,297	51,012	50,297
Expenditures for long-lived assets	241	39	477	93
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	4,981	3,028	13,758	8,653
Noninterest income	381	1,469	7,569	(294)
Net interest income after provision for loan losses	4,981	3,028	13,758	8,653
Provision for loan losses	0	0	0	0
Depreciation and amortization	51	52	154	161
Other noninterest expenses related to segments	2,687	3,782	14,894	9,410
Total noninterest expense	2,738	3,834	15,048	9,571
Income before income taxes	2,624	663	6,279	(1,212)
Income tax expense	535	(171)	1,181	(1,933)
Net income	2,089	834	5,098	721
Total assets	572,111	621,511	572,111	621,511
Expenditures for long-lived assets	$ 66	$ 25	$ 128	$ 71