Derivatives and Hedging Activities (Derivative Instruments not Designated as Hedging Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivatives not designated in hedge relationships
Derivative Asset, Fair Value	$ 47,902	$ 63,231
Derivative Liability, Fair Value	58,201	77,968
Not Designated as Hedging Instrument
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	1,760,450	1,379,768
Derivative Asset, Fair Value	47,902	63,231
Derivative Liability, Notional/Contract Amount	1,743,151	1,391,595
Derivative Liability, Fair Value	46,627	58,888
Not Designated as Hedging Instrument | Interest Rate Swap
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	1,622,525	1,204,835
Derivative Asset, Fair Value	46,577	58,769
Derivative Liability, Notional/Contract Amount	1,622,531	1,204,835
Derivative Liability, Fair Value	46,577	58,769
Not Designated as Hedging Instrument | Mortgage Loan Commitments
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	90,541	168,271
Derivative Asset, Fair Value	891	4,400
Derivative Liability, Notional/Contract Amount	0	0
Derivative Liability, Fair Value	0	0
Not Designated as Hedging Instrument | Forward Contracts
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	40,906	0
Derivative Asset, Fair Value	384	0
Derivative Liability, Notional/Contract Amount	0	124,017
Derivative Liability, Fair Value	0	62
Not Designated as Hedging Instrument | Foreign Exchange
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	6,478	6,662
Derivative Asset, Fair Value	50	62
Derivative Liability, Notional/Contract Amount	6,893	6,026
Derivative Liability, Fair Value	50	57
Not Designated as Hedging Instrument | Credit contracts
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	0	0
Derivative Asset, Fair Value	0	0
Derivative Liability, Notional/Contract Amount	49,914	25,225
Derivative Liability, Fair Value	0	0
Not Designated as Hedging Instrument | Other Contract
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	0	0
Derivative Asset, Fair Value	0	0
Derivative Liability, Notional/Contract Amount	63,813	31,492
Derivative Liability, Fair Value	$ 0	$ 0