Goodwill and Intangible Assets Intangibles (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 59,402,000	$ 61,682,000
Finite-Lived Intangible Assets, Accumulated Amortization	(55,758,000)	(54,741,000)
Finite-Lived Intangible Assets, Net	3,644,000	6,941,000
Indefinite-Lived Intangible Assets (Excluding Goodwill)	1,263,000	1,263,000
Intangible Assets Gross (Excluding Goodwill)	60,665,000	62,945,000
Intangible Assets, Net (Excluding Goodwill)	4,907,000	8,204,000
Amortization of Intangible Assets	3,031,000	4,257,000	5,240,000	5,200,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2013	2,138,000
2014	1,259,000
2015	247,000
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	50,279,000	50,279,000
Finite-Lived Intangible Assets, Accumulated Amortization	(46,766,000)	(44,134,000)
Finite-Lived Intangible Assets, Net	3,513,000	6,145,000
Finite-Lived Intangible Assets, Weighted-Average Useful Life	3 years
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	9,123,000	11,403,000
Finite-Lived Intangible Assets, Accumulated Amortization	(8,992,000)	(10,607,000)
Finite-Lived Intangible Assets, Net	131,000	796,000
Other Intangible Assets [Member] | Global Exchange [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,300,000
Finite-Lived Intangible Assets, Net	$ (266,000)
Branch Acquisitions Not Qualifing For Business Combinations Accounting [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life	2 years