Goodwill and Other Intangible Assets Goodwill and Accumulated Impairment Charges (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill prior to impairment	$ 176,578	$ 194,569
Cumulative goodwill impairment	(118,971)	(118,971)
Goodwill	57,607	75,598	$ 142,554
Private Banking
Goodwill [Line Items]
Goodwill prior to impairment	34,281	34,281
Cumulative goodwill impairment	(34,281)	(34,281)
Goodwill	0	0	0
Wealth Management and Trust
Goodwill [Line Items]
Goodwill prior to impairment	44,305	44,305
Cumulative goodwill impairment	(9,528)	(9,528)
Goodwill	34,777	34,777	34,777
Affiliate Partners (4)
Goodwill [Line Items]
Goodwill prior to impairment	97,992	115,983
Cumulative goodwill impairment	(75,162)	(75,162)
Goodwill	$ 22,830	$ 40,821	$ 107,777