Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 segment	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Number of primary operating segments			2
Number of reportable segments			2
Income Statement Information
Net interest income (expense)	$ 27,444	$ 32,574	$ 86,552	$ 102,781
Provision for loan losses	(1,811)	2,159	3,398	(305)
Noninterest income	4,452	3,716	11,779	4,953
Noninterest expense	21,121	21,008	62,668	62,439
Income before income tax expense	12,586	13,123	32,265	45,600
Total assets	3,209,590		3,209,590		3,170,197
Banking
Income Statement Information
Net interest income (expense)	27,804	33,476	87,733	105,738
Provision for loan losses	(1,811)	2,159	3,398	(305)
Noninterest income	2,424	1,684	5,448	(1,758)
Noninterest expense	18,353	17,855	53,817	53,006
Income before income tax expense	13,686	15,146	35,966	51,279
Total assets	3,093,055		3,093,055		3,051,256
Wealth Management
Income Statement Information
Net interest income (expense)	(16)	(166)	(58)	(292)
Provision for loan losses	0	0	0	0
Noninterest income	1,909	2,006	6,200	6,611
Noninterest expense	1,946	1,809	5,589	5,644
Income before income tax expense	(53)	31	553	675
Total assets	98,269		98,269		101,026
Corporate and Intercompany
Income Statement Information
Net interest income (expense)	(344)	(736)	(1,123)	(2,665)
Provision for loan losses	0	0	0	0
Noninterest income	119	26	131	100
Noninterest expense	822	1,344	3,262	3,789
Income before income tax expense	(1,047)	(2,054)	(4,254)	(6,354)
Total assets	$ 18,266		$ 18,266		$ 17,915