Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net interest income	$ 23,836	$ 22,467
Noninterest income	19,370	13,166
Total income	43,206	35,633
Provision for loan losses	300	600
Depreciation and amortization	947	1,020
Other Noninterest Expenses Related to Segments	28,345	23,164
Total noninterest expense	29,292	24,184
Income before income taxes	13,614	10,849
Income tax expense	4,316	3,428
Net income	9,298	7,421
Total assets	3,194,146	3,051,848	3,188,867
Expenditures for long-lived assets	1,291	427
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	19,739	19,511
Noninterest income	4,541	7,946
Total income	24,280	27,457
Provision for loan losses	300	600
Depreciation and amortization	585	638
Other Noninterest Expenses Related to Segments	13,553	15,136
Total noninterest expense	14,138	15,774
Income before income taxes	9,842	11,083
Income tax expense	3,261	3,843
Net income	6,581	7,240
Total assets	2,577,350	2,439,300
Expenditures for long-lived assets	1,075	370
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income	(4)	7
Noninterest income	8,065	7,474
Total income	8,061	7,481
Provision for loan losses	0	0
Depreciation and amortization	311	327
Other Noninterest Expenses Related to Segments	5,387	5,112
Total noninterest expense	5,698	5,439
Income before income taxes	2,363	2,042
Income tax expense	876	763
Net income	1,487	1,279
Total assets	52,475	51,737
Expenditures for long-lived assets	171	26
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	4,101	2,949
Noninterest income	6,764	(2,254)
Total income	10,865	695
Provision for loan losses	0	0
Depreciation and amortization	51	55
Other Noninterest Expenses Related to Segments	9,405	2,916
Total noninterest expense	9,456	2,971
Income before income taxes	1,409	(2,276)
Income tax expense	179	(1,178)
Net income	1,230	(1,098)
Total assets	564,321	560,811
Expenditures for long-lived assets	$ 45	$ 31