Derivatives (Derivatives Associated With Interest Rate Risk Management Activities) (Details) (USD $) In Thousands						3 Months Ended				6 Months Ended						3 Months Ended				6 Months Ended				3 Months Ended				6 Months Ended				3 Months Ended				6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Jun. 30, 2011 Customer Interest Rate Contracts [Member]	Jun. 30, 2010 Customer Interest Rate Contracts [Member]	Jun. 30, 2011 Customer Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments and Hedged Items [Member]		Jun. 30, 2010 Customer Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments and Hedged Items [Member]		Jun. 30, 2011 Customer Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments and Hedged Items [Member]		Jun. 30, 2010 Customer Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments and Hedged Items [Member]		Jun. 30, 2011 Offsetting Upstream Interest Rate Contracts [Member]	Jun. 30, 2010 Offsetting Upstream Interest Rate Contracts [Member]	Jun. 30, 2011 Offsetting Upstream Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments and Hedged Items [Member]		Jun. 30, 2010 Offsetting Upstream Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments and Hedged Items [Member]		Jun. 30, 2011 Offsetting Upstream Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments and Hedged Items [Member]		Jun. 30, 2010 Offsetting Upstream Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments and Hedged Items [Member]		Jun. 30, 2011 Interest Rate Swaps [Member] Debt Hedging [Member] Hedging Instruments [Member]		Jun. 30, 2010 Interest Rate Swaps [Member] Debt Hedging [Member] Hedging Instruments [Member]		Jun. 30, 2011 Interest Rate Swaps [Member] Debt Hedging [Member] Hedging Instruments [Member]		Jun. 30, 2010 Interest Rate Swaps [Member] Debt Hedging [Member] Hedging Instruments [Member]		Jun. 30, 2011 Term Borrowings [Member] Debt Hedging [Member] Hedged Items [Member]		Jun. 30, 2010 Term Borrowings [Member] Debt Hedging [Member] Hedged Items [Member]		Jun. 30, 2011 Term Borrowings [Member] Debt Hedging [Member] Hedged Items [Member]		Jun. 30, 2010 Term Borrowings [Member] Debt Hedging [Member] Hedged Items [Member]
Notional				$ 1,458,306	$ 1,679,157	$ 980,417	[1]	$ 1,168,042	[1]	$ 980,417	[1]	$ 1,168,042	[1]	$ 1,458,306	$ 1,679,157	$ 980,417	[1]	$ 1,168,042	[1]	$ 980,417	[1]	$ 1,168,042	[1]	$ 1,604,000	[2]	$ 1,104,000	[2]	$ 1,604,000	[2]	$ 1,104,000	[2]
Assets				72,576	82,406	65,074	[1]	88,496	[1]	65,074	[1]	88,496	[1]	1,537	4,687	414	[1]	210	[1]	414	[1]	210	[1]	113,090	[2]	116,415	[2]	113,090	[2]	116,415	[2]
Liabilities				1,537	4,687	414	[1]	210	[1]	414	[1]	210	[1]	72,576	82,406	67,774	[1]	93,095	[1]	67,774	[1]	93,095	[1]	12,023	[2]			12,023	[2]
Gains/(Losses)						3,996	[1]	16,895	[1]	(6,894)	[1]	23,344	[1]			(4,596)	[1]	(17,494)	[1]	6,994	[1]	(24,444)	[1]	22,789	[2]	26,145	[2]	3,362	[2]	39,429	[2]
Term borrowings	2,502,517	3,228,070	2,926,675																													1,604,000	[2],[3]	1,104,000	[2],[3]	1,604,000	[2],[3]	1,104,000	[2],[3]
Gains/(Losses) related to term borrowings																																$ (22,789)	[2],[4]	$ (26,145)	[2],[4]	$ (3,362)	[2],[4]	$ (39,429)	[2],[4]

[1] Gains/losses included in the Other expense section of the Consolidated Condensed Statements of Income.

[2] Gains/losses included in the All other income and commissions section of the Consolidated Condensed Statements of Income.

[3] Represents par value of long term debt being hedged.

[4] Represents gains/losses attributable to changes in fair value due to interest rate risk as designated in ASC 815-20 hedging relationships.