Fair Value Measurements (Details 4) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Contingent Consideration Liability
Level 3 Liabilities Measured on a Recurring Basis
Balance, beginning of period	$ (49,900,000)	$ (47,724,000)
Total realized/unrealized gains (losses):
Settlements	16,250,000
Other (1)	(411,000)	(549,000)
Balance, end of period	(34,061,000)	(48,273,000)
Contingent Consideration Liability | Rochdale Investment Management, LLC
Total realized/unrealized gains (losses):
Period of additional cash consideration payment	6 years
Low-end of the potential range of estimate of total consideration payment	16,000,000
High-end of the potential range of estimate of total consideration payment	58,000,000
FDIC Clawback Liability
Level 3 Liabilities Measured on a Recurring Basis
Balance, beginning of period	(11,967,000)	(9,970,000)
Total realized/unrealized gains (losses):
Included in earnings	(964,000)	(795,000)
Balance, end of period	$ (12,931,000)	$ (10,765,000)