Derivatives and Hedging Activities (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012
Derivatives not designated in hedge relationships
Derivative Asset, Fair Value	$ 53,158		$ 63,231		$ 66,619
Derivative Liability, Fair Value	62,217		77,968		85,803
Not Designated as Hedging Instrument [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	1,901,310		1,379,768		1,338,748
Derivative Asset, Fair Value	53,158	[1]	63,231	[1]	66,619	[1]
Derivative Liability, Notional/Contract Amount	1,612,438		1,391,595		1,289,806
Derivative Liability, Fair Value	47,898	[2]	58,888	[2]	62,574	[2]
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	1,502,079		1,204,835		1,094,355
Derivative Asset, Fair Value	47,804	[1]	58,769	[1]	61,319	[1]
Derivative Liability, Notional/Contract Amount	1,502,079		1,204,835		1,094,355
Derivative Liability, Fair Value	47,804	[2]	58,769	[2]	61,319	[2]
Not Designated as Hedging Instrument [Member] | Mortgage loan commitments [Member]
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	251,198		168,271		239,901
Derivative Asset, Fair Value	779	[1]	4,400	[1]	5,248	[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	139,093		0		0
Derivative Asset, Fair Value	4,458	[1]	0	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	0		124,017		151,018
Derivative Liability, Fair Value	0	[2]	62	[2]	1,201	[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	50,754		25,225		13,215
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	8,940		6,662		4,492
Derivative Asset, Fair Value	117	[1]	62	[1]	52	[1]
Derivative Liability, Notional/Contract Amount	7,235		6,026		5,533
Derivative Liability, Fair Value	94	[2]	57	[2]	54	[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	52,370		31,492		25,685
Derivative Liability, Fair Value	$ 0	[2]	$ 0	[2]	$ 0	[2]

[1] (a) Included in Other Assets on the Consolidated Balance Sheet

[2] (b) Included in Other Liabilities on the Consolidated Balance Sheet