Derivatives and Hedging Activities (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011
Derivatives not designated in hedge relationships
Derivative Asset, Fair Value	$ 65,418		$ 62,056		$ 47,809
Derivative Liability, Fair Value	84,602		86,106		72,037
Mortgage loan commitments [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Fair Value	5,248	[1]
Forward sales contracts [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Fair Value	(1,201)	[1]
Foreign exchange [Member]
Derivatives not designated in hedge relationships
Derivative Liability, Fair Value	54	[2]
Other [Member]
Derivatives not designated in hedge relationships
Derivative Liability, Fair Value	0	[2]
Not Designated as Hedging Instrument [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	1,489,766		1,331,296		1,081,846
Derivative Asset, Fair Value	65,418	[1]	62,101	[1]	47,809	[1]
Derivative Liability, Notional/Contract Amount	1,138,788		1,019,661		909,640
Derivative Liability, Fair Value	61,373	[2]	60,261	[2]	46,265	[2]
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	1,094,355		976,823		863,344
Derivative Asset, Fair Value	61,319	[1]	58,875	[1]	46,246	[1]
Derivative Liability, Notional/Contract Amount	1,094,355		976,823		863,344
Derivative Liability, Fair Value	61,319	[2]	58,875	[2]	46,246	[2]
Not Designated as Hedging Instrument [Member] | Mortgage loan commitments [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	239,901		191,514		129,909
Derivative Asset, Fair Value			4,959	[1]	1,539	[1]
Derivative Liability, Notional/Contract Amount	0		0		0
Derivative Liability, Fair Value	0	[2]	0	[2]	0	[2]
Not Designated as Hedging Instrument [Member] | Forward sales contracts [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	151,018		159,377		84,517
Derivative Asset, Fair Value			(1,798)	[1]	5	[1]
Derivative Liability, Notional/Contract Amount	0		0		0
Derivative Liability, Fair Value	0	[2]	0	[2]	0	[2]
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	[1]	0	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	13,215		17,951		24,714
Derivative Liability, Fair Value	0	[2]	0	[2]	0	[2]
Not Designated as Hedging Instrument [Member] | Foreign exchange [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	4,492		3,582		4,076
Derivative Asset, Fair Value	52	[1]	65	[1]	19	[1]
Derivative Liability, Notional/Contract Amount	5,533		3,793		4,076
Derivative Liability, Fair Value			62	[2]	19	[2]
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	[1]	0	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	25,685		21,094		17,506
Derivative Liability, Fair Value			$ 1,324	[2]	$ 0	[2]

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

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