Loans and Allowance for Credit Losses Residential Mortgage (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Non Performing Residential Mortgages [Member]	Dec. 31, 2011 Non Performing Residential Mortgages [Member] Residential Mortgage [Member]	Dec. 31, 2011 Non Performing Residential Mortgages [Member] Real-estate - home equity
Mortgage Loans on Real Estate, Write-down or Reserve [Line Items]
Mortgage Loans on Real Estate, Cost of Mortgages Sold					$ 34,700,000	$ 200,000
Recorded Investment In Loans Sold				34,810
Proceeds From Sale Net Of Investments				17,420
Loans Charged Off, Net Of Recoveries	152,321,000	142,055,000	112,604,000	(17,390)
Financing Receivable, Allowance for Credit Losses, Charge-offs				$ (12,360)