Derivatives and Hedging Activities (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2011
Derivatives not designated in hedge relationships
Derivative Asset, Fair Value	$ 68,047		$ 62,056		$ 65,318
Derivative Liability, Fair Value	84,938		86,106		89,657
Foreign exchange [Member]
Derivatives not designated in hedge relationships
Derivative Liability, Fair Value	71	[1]
Other [Member]
Derivatives not designated in hedge relationships
Derivative Liability, Fair Value	0	[1]
Not Designated as Hedging Instrument [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	1,537,034		1,331,296		1,347,296
Derivative Asset, Fair Value	68,047	[2]	62,101	[2]	65,318	[2]
Derivative Liability, Notional/Contract Amount	1,219,895		1,019,661		978,948
Derivative Liability, Fair Value	62,867	[1]	60,261	[1]	61,379	[1]
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	1,166,765		976,823		934,248
Derivative Asset, Fair Value	62,796	[2]	58,875	[2]	61,299	[2]
Derivative Liability, Notional/Contract Amount	1,166,765		976,823		934,248
Derivative Liability, Fair Value	62,796	[1]	58,875	[1]	61,299	[1]
Not Designated as Hedging Instrument [Member] | Mortgage loan commitments [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	221,057		191,514		227,999
Derivative Asset, Fair Value	7,394	[2]	4,959	[2]	5,525	[2]
Derivative Liability, Notional/Contract Amount	0		0		0
Derivative Liability, Fair Value	0	[1]	0	[1]	0	[1]
Not Designated as Hedging Instrument [Member] | Forward sales contracts [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	144,849		159,377		182,588
Derivative Asset, Fair Value	(2,223)	[2]	(1,798)	[2]	(1,591)	[2]
Derivative Liability, Notional/Contract Amount	0		0		0
Derivative Liability, Fair Value	0	[1]	0	[1]	0	[1]
Not Designated as Hedging Instrument [Member] | Credit contracts [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	0		0		0
Derivative Asset, Fair Value	0	[2]	0	[2]	0	[2]
Derivative Liability, Notional/Contract Amount	20,861		17,951		24,435
Derivative Liability, Fair Value	0	[1]	0	[1]	0	[1]
Not Designated as Hedging Instrument [Member] | Foreign exchange [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	4,363		3,582		2,461
Derivative Asset, Fair Value	80	[2]	65	[2]	85	[2]
Derivative Liability, Notional/Contract Amount	4,371		3,793		2,456
Derivative Liability, Fair Value			62	[1]	80	[1]
Not Designated as Hedging Instrument [Member] | Other [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	0		0		0
Derivative Asset, Fair Value	0	[2]	0	[2]	0	[2]
Derivative Liability, Notional/Contract Amount	27,898		21,094		17,809
Derivative Liability, Fair Value			$ 1,324	[1]	$ 0	[1]

[1] Included in Other Liabilities on the Consolidated Balance Sheets

[2] Included in Other Assets on the Consolidated Balance Sheets