Derivatives (Derivatives Associated With Interest Rate Risk Management Activities) (Details) (USD $)						3 Months Ended				9 Months Ended						3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014 Customer Interest Rate Contracts [Member]	Sep. 30, 2013 Customer Interest Rate Contracts [Member]	Sep. 30, 2014 Customer Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments And Hedged Items [Member]		Sep. 30, 2013 Customer Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments And Hedged Items [Member]		Sep. 30, 2014 Customer Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments And Hedged Items [Member]		Sep. 30, 2013 Customer Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments And Hedged Items [Member]		Sep. 30, 2014 Offsetting Upstream Interest Rate Contracts [Member]	Sep. 30, 2013 Offsetting Upstream Interest Rate Contracts [Member]	Sep. 30, 2014 Offsetting Upstream Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments And Hedged Items [Member]		Sep. 30, 2013 Offsetting Upstream Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments And Hedged Items [Member]		Sep. 30, 2014 Offsetting Upstream Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments And Hedged Items [Member]		Sep. 30, 2013 Offsetting Upstream Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments And Hedged Items [Member]		Sep. 30, 2014 Interest Rate Swap [Member] Debt [Member] Hedging Instruments [Member]		Sep. 30, 2013 Interest Rate Swap [Member] Debt [Member] Hedging Instruments [Member]		Sep. 30, 2014 Interest Rate Swap [Member] Debt [Member] Hedging Instruments [Member]		Sep. 30, 2013 Interest Rate Swap [Member] Debt [Member] Hedging Instruments [Member]		Sep. 30, 2014 Long Term Debt [Member] Debt [Member] Hedged Items [Member]		Sep. 30, 2013 Long Term Debt [Member] Debt [Member] Hedged Items [Member]		Sep. 30, 2014 Long Term Debt [Member] Debt [Member] Hedged Items [Member]		Sep. 30, 2013 Long Term Debt [Member] Debt [Member] Hedged Items [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional				$ 1,731,047,000	$ 1,742,060,000	$ 742,065,000	[1]	$ 801,260,000	[1]	$ 742,065,000	[1]	$ 801,260,000	[1]	$ 1,731,047,000	$ 1,742,060,000	$ 742,065,000	[1]	$ 817,901,000	[1]	$ 742,065,000	[1]	$ 817,901,000	[1]	$ 1,254,000,000	[2]	$ 1,254,000,000	[2]	$ 1,254,000,000	[2]	$ 1,254,000,000	[2]
Assets				69,878,000	88,154,000	25,039,000	[1]	34,703,000	[1]	25,039,000	[1]	34,703,000	[1]	5,778,000	6,880,000	1,128,000	[1]	2,453,000	[1]	1,128,000	[1]	2,453,000	[1]	32,711,000	[2]	66,049,000	[2]	32,711,000	[2]	66,049,000	[2]
Liabilities				5,778,000	6,880,000	1,128,000	[1]	2,452,000	[1]	1,128,000	[1]	2,452,000	[1]	69,878,000	88,154,000	25,539,000	[1]	35,203,000	[1]	25,539,000	[1]	35,203,000	[1]	9,787,000	[2]	19,622,000	[2]	9,787,000	[2]	19,622,000	[2]
Gains/(Losses)						(3,235,000)	[1]	(1,464,000)	[1]	(1,166,000)	[1]	(22,673,000)	[1]			3,235,000	[1]	1,465,000	[1]	1,166,000	[1]	23,374,000	[1]	(7,074,000)	[2]	(6,430,000)	[2]	(10,313,000)	[2]	(48,777,000)	[2]
Term borrowings	1,491,138,000	1,739,859,000	1,771,288,000																													1,254,000,000	[2],[3]	1,254,000,000	[2],[3]	1,254,000,000	[2],[3]	1,254,000,000	[2],[3]
Gains/(Losses) related to term borrowings																																$ 7,074,000	[2],[4]	$ 6,430,000	[2],[4]	$ 10,313,000	[2],[4]	$ 48,777,000	[2],[4]

[1] Gains/losses included in the Other expense section of the ConsolidatedCondensed 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 term borrowings being hedged.

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