Derivative Instruments (Composition Of Derivative Instruments And Fair Value) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Liability Derivatives [Member]
Derivative [Line Items]
Total	$ 105,773		$ 104,140
Grand total derivatives	106,064		104,849
Liability Derivatives [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Interest rate contracts, Notional		[1],[2]		[1],[2]
Interest rate contracts, Fair Value		[2]		[2]
Liability Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Interest rate contracts, Notional	3,294,148	[1],[3]	2,985,774	[1],[3]
Total derivatives not designated as hedging instruments	106,064		104,849
Liability Derivatives [Member] | Not Designated as Hedging Instrument [Member] | Capital Markets Group Derivatives [Member]
Derivative [Line Items]
Foreign exchange contracts, Notional	115,041	[1],[3]	101,401	[1],[3]
Credit contracts, Notional	146,092	[1],[3]	94,921	[1],[3]
Interest rate contracts, Fair Value	109,766	[2]	107,612	[2]
Foreign exchange contracts, Fair Value	2,744	[2]	4,517	[2]
Credit contracts, Fair Value	44	[1],[3]	32	[1],[3]
Capital markets group derivatives, Fair Value	112,554		112,161
Netting adjustments	(6,781)	[4]	(8,021)	[4]
Liability Derivatives [Member] | Not Designated as Hedging Instrument [Member] | Other Derivatives [Member]
Derivative [Line Items]
Foreign exchange contracts, Notional	354	[1],[2]	3,883	[1],[2]
Foreign exchange contracts	2	[2]	26	[2]
Mortgage banking derivatives	289	[2]	683	[2]
Warrants		[2]		[2]
Other derivatives subtotal, Fair Value	291		709
Asset Derivatives [Member]
Derivative [Line Items]
Total	102,613		101,676
Grand total derivatives	109,558		105,021
Asset Derivatives [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Interest rate contracts, Notional	300,000	[1],[2]	200,000	[1],[2]
Interest rate contracts, Fair Value	6,640	[2]	2,586	[2]
Asset Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Interest rate contracts, Notional	3,294,148	[1],[3]	2,985,774	[1],[3]
Total	102,918		102,435
Asset Derivatives [Member] | Not Designated as Hedging Instrument [Member] | Capital Markets Group Derivatives [Member]
Derivative [Line Items]
Foreign exchange contracts, Notional	115,041	[1],[3]	101,401	[1],[3]
Credit contracts, Notional	43,070	[1],[3]	43,218	[1],[3]
Interest rate contracts, Fair Value	105,879	[3]	104,482	[3]
Foreign exchange contracts, Fair Value	3,501	[3]	5,203	[3]
Credit contracts, Fair Value	14	[1],[3]	12	[1],[3]
Capital markets group derivatives, Fair Value	109,394		109,697
Netting adjustments	(6,781)	[4]	(8,021)	[4]
Asset Derivatives [Member] | Not Designated as Hedging Instrument [Member] | Other Derivatives [Member]
Derivative [Line Items]
Foreign exchange contracts, Notional			8,217	[1],[2]
Foreign exchange contracts			196	[2]
Mortgage banking derivatives	286	[2]	563	[2]
Warrants	19	[2]
Other derivatives subtotal, Fair Value	$ 305		$ 759

[1] The remaining average notional amounts are shown for credit contracts.

[2] The fair value of derivative assets and liabilities designated as hedging instruments and other derivative assets and liabilities not designated as hedging instruments are reported in other assets and other liabilities on the Consolidated Statements of Financial Condition, respectively.

[3] Capital markets group asset and liability derivatives are reported separately on the Consolidated Statements of Financial Condition.

[4] Represents netting of derivative asset and liability balances, and related cash collateral, with the same counterparty subject to master netting agreements. Authoritative accounting guidance permits the netting of derivative receivables and payables when a legally enforceable master netting agreement exists between the Company and a derivative counterparty. A master netting agreement is an agreement between two counterparties who have multiple derivative contracts with each other that provide for the net settlement of contracts through a single payment, in a single currency, in the event of default on or termination of any one contract.