Business Combinations (Details) (USD $)	12 Months Ended			1 Months Ended		0 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2012 Rochdale Investment Management, LLC	Jul. 02, 2012 Rochdale Investment Management, LLC	Jul. 02, 2012 Rochdale Investment Management, LLC Client Contract	Apr. 30, 2012 First American Equipment Finance	Dec. 31, 2013 Nevada Commerce Bank	Dec. 31, 2011 Nevada Commerce Bank	Apr. 08, 2011 Nevada Commerce Bank
Business acquisitions
Goodwill	$ 486,383,000	$ 642,622,000	$ 642,622,000		$ 86,500,000		$ 68,400,000
Customer contract intangible						19,000,000
Recognized contingent consideration liability at fair value					46,700,000
Period of additional cash consideration payment				6 years
Low-end of the potential range of estimate of total consideration payment					32,000,000
High-end of the potential range of estimate of total consideration payment					74,000,000
Carrying value of assets acquired							343,000,000			138,900,000
Carrying value of liabilities assumed							325,000,000			121,900,000
Fair value of acquired lease receivables							318,300,000
Borrowings and nonrecourse debt							320,900,000
Cash from the FDIC										2,700,000
Gain on acquisition	$ 8,164,000								$ 8,200,000
FDIC reimbursement (as a percent)								80.00%
Term of loss-sharing agreements for single family residential loans								10 years
Term of loss-sharing agreements for other loans								8 years