Goodwill and Other Intangible Assets (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013
Business acquisitions
Acquired goodwill	$ 156,239,000
Estimated aggregate amortization of intangibles
2014		5,800,000
2015		4,900,000
2016		4,500,000
2017		4,500,000
2018		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
Estimated aggregate amortization of intangibles
Intangibles acquired	$ 19,000,000