Loans (Narrative) (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2011 years		Sep. 30, 2010		Sep. 30, 2011 years		Sep. 30, 2010		Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Nonaccrual Commercial Loans Minimum					$ 1,000,000
Troubled debt restructurings loans	259,600,000		253,700,000		259,600,000		253,700,000
Allowance for loan losses	449,645,000	[1],[2]	719,899,000	[1],[2]	449,645,000	[1],[2]	719,899,000	[1],[2]	524,091,000	664,799,000	781,269,000	896,914,000
Impaired Financing Receivable, Average Recorded Investment	551,958,000		587,600,000		562,315,000		583,100,000
Impaired Financing Receivable, Interest Income, Accrual Method	1,613,000		700,000		4,731,000		2,000,000
Forbearance Agreements Time Period	generally 3 to 6 months				generally 3 to 6 months
Credit Card Workout Program, Granted Rate Reduction, Percentage, Minimum	0.00%				0.00%
Credit Card Workout Program, Maximum, Term Extension	5				5
Unpaid Principal Balance Of Loans Sold	188,000,000
Unpaid principal balance after partial charge-offs and LOCOM of permanent mortgages sold	126,000,000				126,000,000
Net pre-tax losses in Provision for loan losses	29,800,000
Net charge-offs associated with loans sold	40,200,000
All Commercial Loans Minimum					1,000,000
Certain commercial loans					500,000
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payment Reductions, Time Period	1				1
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payment Reductions, Time Period	6				6
Permanent Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	31,662,000	[1],[2]	64,863,000	[1],[2]	31,662,000	[1],[2]	64,863,000	[1],[2]	46,602,000	65,009,000	77,313,000	123,897,000
Maximum maturities, in years, for TDRs	40				40
Real Estate Installment Loans And Heloc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum maturities, in years, for TDRs	20				20
TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
LOCOM valuation allowance	35,300,000		35,600,000		35,300,000		35,600,000
C&I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of commercial loan portfolio	9.00%				9.00%
Loans Held For Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings loans	72,200,000		46,300,000		72,200,000		46,300,000
Real Estate Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	43.00%				43.00%
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	33.00%				33.00%
Allowance for loan losses	162,070,000	[1],[2]	194,900,000	[1],[2]	162,070,000	[1],[2]	194,900,000	[1],[2]	162,655,000	192,350,000	205,752,000	215,087,000
Bank-Related And TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage contributed in total loan	4.00%				4.00%
Bank-related and trust preferred loans total	700,000,000				700,000,000
Modified Loans Classified As A TDR [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	50,000,000				50,000,000
Consumer TDR, reduction of interest rate by increment	25				25
Modified Interest Rate, Minimum, Consumer Loan	1.00%				1.00%
Modified Interest Rate Time Period, Maximum For Consumer Loans	5				5
Allowance For TDRs To Recorded Investment Of TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of the allowance for loan losses to loans	19.00%				19.00%
Nonperforming Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance commercial loans sold	32,000,000
Unpaid principal balance after partial charge offs commercial loans sold	23,000,000
Net pre-tax losses in Provision for loan losses	6,000,000
Net charge-offs associated with loans sold	$ 7,300,000

[1] Q3 2011 and Q3 2010 include $26.9 million and $41.9 million of reserves, respectively, and $623.3 million and $735.8 million of balances in restricted consumer real estate loans, respectively.

[2] Q3 2011 and Q3 2010 include $5.5 million and $5.9 million of reserves, respectively, and $42.4 million and $60.7 million of balances in restricted permanent mortgage loans, respectively.