Goodwill and Intangible Assets Intangibles (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 61,682	$ 62,157
Finite-Lived Intangible Assets, Accumulated Amortization	(54,741)	(50,959)
Finite-Lived Intangible Assets, Net	6,941	11,198
Indefinite-Lived Intangible Assets (Excluding Goodwill)	1,263	1,263
Intangible Assets Gross (Excluding Goodwill)	62,945	63,420
Intangible Assets, Net (Excluding Goodwill)	8,204	12,461
Amortization of Intangible Assets	4,257	5,240	5,747
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2012	3,008
2013	2,240
2014	1,340
2015	310
2016	43
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	50,279	50,279
Finite-Lived Intangible Assets, Accumulated Amortization	(44,134)	(40,475)
Finite-Lived Intangible Assets, Net	6,145	9,804
Finite-Lived Intangible Assets, Weighted-Average Useful Life	4
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	11,403	11,878
Finite-Lived Intangible Assets, Accumulated Amortization	(10,607)	(10,484)
Finite-Lived Intangible Assets, Net	$ 796	$ 1,394
Finite-Lived Intangible Assets, Weighted-Average Useful Life	5
Branch Acquisitions Not Qualifing For Business Combinations Accounting [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life	3