Restructuring (Details) (USD $)	3 Months Ended						21 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date							$ 12,300,000
Restructuring Reserve	4,111,000	1,392,000	2,513,000	3,869,000	4,605,000	1,833,000	4,111,000	3,099,000	0
Restructuring and Related Cost, Incurred Cost	3,581,000	564,000	135,000	1,116,000	4,304,000	1,982,000
Restructuring Reserve, Settled with Cash	(862,000)	(1,685,000)	(721,000)	(1,852,000)	(1,532,000)	(149,000)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	4,013,000	1,181,000	2,198,000	3,111,000	3,267,000	1,161,000	4,013,000	2,658,000	0
Restructuring and Related Cost, Incurred Cost	3,409,000	22,000	(1,000)	142,000	2,500,000	1,161,000
Restructuring Reserve, Settled with Cash	(577,000)	(1,039,000)	(459,000)	(298,000)	(394,000)	0
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	98,000	211,000	211,000	211,000	571,000	0	98,000	211,000	0
Restructuring and Related Cost, Incurred Cost	147,000	255,000	0	300,000	571,000	0
Restructuring Reserve, Settled with Cash	(260,000)	(255,000)	0	(660,000)	0	0
Professional Fees [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	0	104,000	547,000	767,000	672,000	0	230,000	0
Restructuring and Related Cost, Incurred Cost	22,000	183,000	128,000	459,000	783,000	815,000
Restructuring Reserve, Settled with Cash	(22,000)	(287,000)	(254,000)	(679,000)	(688,000)	(143,000)
Other Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	0	0	0	0	0	0	0	0
Restructuring and Related Cost, Incurred Cost	3,000	104,000	8,000	215,000	450,000	6,000
Restructuring Reserve, Settled with Cash	(3,000)	(104,000)	(8,000)	(215,000)	(450,000)	(6,000)
Private Banking Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date							8,000,000
Holding Company and Eliminations Segment [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date							4,300,000
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost							14,300,000
Minimum [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	2,000,000
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost							15,300,000
Maximum [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 3,000,000