Goodwill and Other Intangible Assets Goodwill and Accumulated Impairment Charges (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill, Gross	$ 236,624	$ 236,624
Goodwill, Impaired, Accumulated Impairment Loss	(94,070)	(84,542)
Goodwill	142,554	152,082
Private Banking Segment [Member]
Goodwill [Line Items]
Goodwill, Gross	34,281	34,281
Goodwill, Impaired, Accumulated Impairment Loss	(34,281)	(34,281)
Goodwill	0	0
Wealth Management and Trust Segment [Member]
Goodwill [Line Items]
Goodwill, Gross	44,305	44,305
Goodwill, Impaired, Accumulated Impairment Loss	(9,528)	0
Goodwill	34,777	44,305
Investment Managers Segment [Member]
Goodwill [Line Items]
Goodwill, Gross	117,216	117,216
Goodwill, Impaired, Accumulated Impairment Loss	(50,261)	(50,261)
Goodwill	66,955	66,955
Wealth Advisors Segment [Member]
Goodwill [Line Items]
Goodwill, Gross	40,822	40,822
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Goodwill	$ 40,822	$ 40,822

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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