Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net interest income	$ 24,468	$ 22,409	$ 48,304	$ 44,876
Noninterest income	12,814	16,394	32,184	29,560
Net interest income after provision for loan losses	24,018	21,709	47,554	43,576
Provision for loan losses	450	700	750	1,300
Depreciation and amortization	945	1,003	1,892	2,023
Other noninterest expenses related to segments	21,503	24,002	49,848	47,166
Total noninterest expense	22,448	25,005	51,740	49,189
Income before income taxes	14,384	13,098	27,998	23,947
Income tax expense	4,587	4,115	8,903	7,543
Net income	9,797	8,983	19,095	16,404
Total assets	3,317,022	3,061,307	3,317,022	3,061,307	3,188,867
Expenditures for long-lived assets	1,390	410	2,681	837
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	19,799	19,731	39,538	39,242
Noninterest income	3,860	7,991	8,401	15,937
Net interest income after provision for loan losses	19,349	19,031	38,788	37,942
Provision for loan losses	450	700	750	1,300
Depreciation and amortization	621	624	1,206	1,262
Other noninterest expenses related to segments	13,219	16,268	26,772	31,404
Total noninterest expense	13,840	16,892	27,978	32,666
Income before income taxes	9,369	10,130	19,211	21,213
Income tax expense	3,102	3,402	6,363	7,898
Net income	6,267	6,728	12,848	13,315
Total assets	2,704,109	2,509,407	2,704,109	2,509,407
Expenditures for long-lived assets	1,308	367	2,383	737
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income	(7)	2	(11)	9
Noninterest income	8,530	7,912	16,595	15,386
Net interest income after provision for loan losses	(7)	2	(11)	9
Provision for loan losses	0	0	0	0
Depreciation and amortization	272	325	583	652
Other noninterest expenses related to segments	5,482	5,022	10,869	10,134
Total noninterest expense	5,754	5,347	11,452	10,786
Income before income taxes	2,769	2,567	5,132	4,609
Income tax expense	1,018	949	1,894	1,815
Net income	1,751	1,618	3,238	2,794
Total assets	53,303	52,129	53,303	52,129
Expenditures for long-lived assets	65	28	236	54
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	4,676	2,676	8,777	5,625
Noninterest income	424	491	7,188	(1,763)
Net interest income after provision for loan losses	4,676	2,676	8,777	5,625
Provision for loan losses	0	0	0	0
Depreciation and amortization	52	54	103	109
Other noninterest expenses related to segments	2,802	2,712	12,207	5,628
Total noninterest expense	2,854	2,766	12,310	5,737
Income before income taxes	2,246	401	3,655	(1,875)
Income tax expense	467	(236)	646	(2,170)
Net income	1,779	637	3,009	295
Total assets	559,610	499,771	559,610	499,771
Expenditures for long-lived assets	$ 17	$ 15	$ 62	$ 46