Goodwill and Other Intangible Assets Carrying Value of Goodwill Rollforward (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill acquired		$ 0	$ 0
Goodwill [Roll Forward]
Goodwill, Beginning of Year		75,598,000	142,554,000
Impairment	$ (24,900,000)	0	(24,901,000)	$ (9,528,000)
Transfer to held for sale (1)			(42,055,000)
Divestitures		(17,991,000)
Goodwill, End of Year	75,598,000	57,607,000	75,598,000	142,554,000
Private Banking
Goodwill [Roll Forward]
Goodwill, Beginning of Year		0	0
Impairment			0
Transfer to held for sale (1)			0
Divestitures		0
Goodwill, End of Year	0	0	0	0
Wealth Management and Trust
Goodwill [Roll Forward]
Goodwill, Beginning of Year		34,777,000	34,777,000
Impairment			0	(9,500,000)
Transfer to held for sale (1)			0
Divestitures		0
Goodwill, End of Year	34,777,000	34,777,000	34,777,000	34,777,000
Affiliate Partners (4)
Goodwill [Roll Forward]
Goodwill, Beginning of Year		40,821,000	107,777,000
Impairment			(24,901,000)
Transfer to held for sale (1)			(42,055,000)
Divestitures		(17,991,000)
Goodwill, End of Year	$ 40,821,000	$ 22,830,000	$ 40,821,000	$ 107,777,000