Additional disclosures on cash flow information and non-cash activities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Cash Flow Noncash Investing And Financing Activities Disclosure Abstract
Transfers Of Loans To Other Real Estate Owned	$ 35,272		$ 85,520
Transfers Of Loans To Other Property	10,538		7,852
Total loans transferred to foreclosed assets	45,810		93,372
Transfer Of Portfolio Loans And Leases To Held For Sale 1	29,896		178,157
Transfer Of Loans Held For Sale To Portfolio Loans 1	1,919		16,109
Noncash Transfer To Securities From Loans Resulting From Securitization	228,515	[1]	413,394	[1]
Trades receivables from brokers and counterparties	74,603		144,171		71,680
Trades Payables To Brokers And Counterparties	222,297		37,149
Recognition of mortgage servicing rights on securitizations or asset transfers	3,528		5,102
Loans sold to a joint venture in exchange for an acquisition loan and an equity interest in the join venture	$ 0		$ 194,514

[1] Includes loans securitized into trading securities and subsequently sold before quarter end.