Loans (Narrative) (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2012 D number Y		Sep. 30, 2011		Sep. 30, 2012 D number Y		Sep. 30, 2011		Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings loans	$ 371,400,000		$ 259,600,000		$ 371,400,000		$ 259,600,000
Allowance for loan losses	281,744,000	[1],[2]	449,645,000	[1],[2]	281,744,000	[1],[2]	449,645,000	[1],[2]	321,051,000	384,351,000	524,091,000	664,799,000
Average balance of impaired loans	483,433,000		551,958,000		473,093,000		562,604,000
Interest income recognized on impaired loan	1,754,000		1,613,000		5,280,000		4,743,000
Forbearance agreements time period	generally 3 to 6 months				generally 3 to 6 months
Consumer TDR, reduction of interest rate by increment, basis points	25.00%				25.00%
Modified interest rate, minimum consumer loan	1.00%				1.00%
Modified interest rate time period, maximum for consumer loans	5				5
Payment Default	30				30
Charge-offs	87,022,000		120,655,000		193,833,000		291,350,000
Nonaccrual status after modification toTDR	30				30
First Lien Past Due 90 Days	90				90
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	25,557,000	[2]	31,662,000	[2]	25,557,000	[2]	31,662,000	[2]	29,112,000	26,194,000	46,602,000	65,009,000
Maximum maturities in years for TDRS	40				40
Charge-offs	2,889,000	[3]	48,556,000	[4]	10,597,000		69,340,000
Permanent Mortgage Portfolio Segment [Member] | Nonperforming Loan Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision			29,800,000
Charge-offs			40,200,000
Unpaid Principal Balance Of Loans Sold			188,000,000				188,000,000
Unpaid Principal Balance After Partial ChargeOffs And Locom			126,000,000
Loans Held For Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings loans	171,900,000		72,200,000		171,900,000		72,200,000
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage					40.00%
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage					32.00%
Allowance for loan losses	115,949,000	[1]	162,070,000	[1]	115,949,000	[1]	162,070,000	[1]	133,421,000	165,077,000	162,655,000	192,350,000
Maximum maturities in years for TDRS	30				30
Charge-offs	69,351,000	[3]	39,122,000		132,618,000		130,886,000
Bank Related And Trup S [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of commercial loan portfolio	7.00%				7.00%
Concentration risk, percentage					4.00%
Commercial loans	600,000,000				600,000,000
Modified Loans Classified As Tdr [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	60,000,000		50,000,000		60,000,000		50,000,000
Ratio of the allowance for loan losses to loans	16.00%		19.00%		16.00%		19.00%
Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of commercial loan portfolio	19.00%				19.00%
Concentration risk, percentage					10.00%
Commercial loans	1,600,000,000				1,600,000,000
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average balance of impaired loans	240,081,000		369,231,000		255,595,000		398,367,000
Interest income recognized on impaired loan	355,000		610,000		1,145,000		2,125,000
Commercial Portfolio Segment [Member] | Nonperforming Loan Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision			6,000,000
Charge-offs			7,300,000
Unpaid Principal Balance Of Loans Sold			32,000,000				32,000,000
Unpaid Principal Balance After Partial ChargeOffs And Locom			23,000,000
Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	6,348,000		8,472,000		6,348,000		8,472,000		6,327,000	7,081,000	9,089,000	12,886,000
Charge-offs	3,259,000		4,927,000		9,238,000		14,511,000
Maximum [Member] | Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payment reductions, time period	1				1
Credit card workout program, maximum, term extension (in years)	5				5
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired nonaccrual commercial loans, minimum					1,000,000
Commercial loans	1,000,000				1,000,000
Certain commercial loans that are graded 13 or worse					$ 500,000
Minimum [Member] | Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payment reductions, time period	6				6
Credit card workout program, granted rate reduction, percentage, minimum	0.00%				0.00%

[1] Balances as of September 30, 2012 and 2011 include $14.7 million and $26.9 million of reserves, respectively, and $417.0 million and $623.3 million of balances in restricted consumer real estate loans and secured borrowings, respectively.

[2] Balances as of September 30, 2012 and 2011 include $.6 million and $5.5 million of reserves, respectively, and $14.2 million and $42.4 million of balances in restricted permanent mortgage loans and secured borrowings, respectively.

[3] Third quarter 2012 includes approximately $40 million of charge-off associated with implementation of recently issued regulatory guidance.

[4] Third quarter 2011 includes $40.2 million of charge-offs associated with loan sales.