Goodwill and Other Intangible Assets (Details 2) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Business acquisitions
Acquired goodwill	$ 156,239,000	$ 333,000
Estimated aggregate amortization of intangibles
2013	7,500,000
2014	5,800,000
2015	4,900,000
2016	4,500,000
2017	4,500,000
First American Equipment Finance
Business acquisitions
Acquired goodwill	68,400,000
Rochdale Investment Management
Business acquisitions
Acquired goodwill	86,500,000
Rochdale Investment Management \| Client advisory contract
Business acquisitions
Intangibles acquired	$ 19,000,000

The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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The amount of amortization expense expected to be recognized during year five of the five succeeding fiscal years.

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