Loans (Accruing And Non-Accruing Loans By Class) (Details) (USD $)	Mar. 31, 2012		Dec. 31, 2011	Mar. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 15,971,330,000	[1],[2]	$ 16,397,127,000	$ 15,972,372,000	[1],[2]
TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
LOCOM valuation allowance	34,200,000			35,600,000
Commercial, Financial, And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	7,705,153,000			6,808,163,000
Commercial, Financial, And Industrial [Member] | General C&I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	6,221,599,000			5,994,923,000
Commercial, Financial, And Industrial [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,070,581,000			383,712,000
Commercial, Financial, And Industrial [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	412,973,000	[3]		429,528,000	[4]
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	5,858,821,000			6,159,774,000
Consumer Real Estate Portfolio Segment [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,582,454,000	[5]		3,975,629,000	[5]
Consumer Real Estate Portfolio Segment [Member] | R/E Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,276,367,000			2,184,145,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,346,926,000			1,618,854,000
Commercial Real Estate [Member] | Income CRE [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,247,089,000			1,397,741,000
Commercial Real Estate [Member] | Residential CRE [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	99,837,000			221,113,000
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	788,700,000	[5]		1,087,524,000	[5]
Credit Card & Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	271,730,000			298,057,000
Credit Card & Other [Member] | Credit Card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	182,568,000			188,366,000
Credit Card & Other [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	89,162,000			109,691,000
Accruing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	15,454,266,000			15,100,397,000
30-89 Days Past Due	105,696,000			161,164,000
90+ Days Past Due	44,193,000			73,663,000
Total Accruing	15,604,155,000			15,335,224,000
Accruing [Member] | Commercial, Financial, And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	7,521,020,000			6,563,693,000
30-89 Days Past Due	29,520,000			29,641,000
90+ Days Past Due	540,000			1,478,000
Total Accruing	7,551,080,000			6,594,812,000
Accruing [Member] | Commercial, Financial, And Industrial [Member] | General C&I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	6,112,259,000			5,813,511,000
30-89 Days Past Due	29,520,000			29,641,000
90+ Days Past Due	540,000			1,478,000
Total Accruing	6,142,319,000			5,844,630,000
Accruing [Member] | Commercial, Financial, And Industrial [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,070,581,000			382,891,000
Total Accruing	1,070,581,000			382,891,000
Accruing [Member] | Commercial, Financial, And Industrial [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	338,180,000	[3]		367,291,000	[4]
Total Accruing	338,180,000	[3]		367,291,000	[4]
Accruing [Member] | Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	5,708,658,000			6,005,350,000
30-89 Days Past Due	55,604,000			71,378,000
90+ Days Past Due	33,232,000			42,961,000
Total Accruing	5,797,494,000			6,119,689,000
Accruing [Member] | Consumer Real Estate Portfolio Segment [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	3,482,488,000	[5]		3,883,059,000	[5]
30-89 Days Past Due	34,419,000	[5]		44,569,000	[5]
90+ Days Past Due	23,398,000	[5]		28,294,000	[5]
Total Accruing	3,540,305,000	[5]		3,955,922,000	[5]
Accruing [Member] | Consumer Real Estate Portfolio Segment [Member] | R/E Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	2,226,170,000			2,122,291,000
30-89 Days Past Due	21,185,000			26,809,000
90+ Days Past Due	9,834,000			14,667,000
Total Accruing	2,257,189,000			2,163,767,000
Accruing [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,223,263,000			1,357,879,000
30-89 Days Past Due	10,217,000			26,883,000
90+ Days Past Due				60,000
Total Accruing	1,233,480,000			1,384,822,000
Accruing [Member] | Commercial Real Estate [Member] | Income CRE [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,168,182,000			1,241,297,000
30-89 Days Past Due	9,160,000			15,648,000
90+ Days Past Due				60,000
Total Accruing	1,177,342,000			1,257,005,000
Accruing [Member] | Commercial Real Estate [Member] | Residential CRE [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	55,081,000			116,582,000
30-89 Days Past Due	1,057,000			11,235,000
Total Accruing	56,138,000			127,817,000
Accruing [Member] | Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	735,156,000	[5]		894,682,000	[5]
30-89 Days Past Due	8,454,000	[5]		30,734,000	[5]
90+ Days Past Due	8,900,000	[5]		27,692,000	[5]
Total Accruing	752,510,000	[5]		953,108,000	[5]
Accruing [Member] | Credit Card & Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	266,169,000			278,793,000
30-89 Days Past Due	1,901,000			2,528,000
90+ Days Past Due	1,521,000			1,472,000
Total Accruing	269,591,000			282,793,000
Accruing [Member] | Credit Card & Other [Member] | Credit Card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	179,744,000			185,265,000
30-89 Days Past Due	1,368,000			1,658,000
90+ Days Past Due	1,456,000			1,443,000
Total Accruing	182,568,000			188,366,000
Accruing [Member] | Credit Card & Other [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	86,425,000			93,528,000
30-89 Days Past Due	533,000			870,000
90+ Days Past Due	65,000			29,000
Total Accruing	87,023,000			94,427,000
Non-Accruing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	134,041,000			210,340,000
30-89 Days Past Due	27,590,000			28,567,000
90+ Days Past Due	205,544,000			398,241,000
Total Non-Accruing	367,175,000			637,148,000
Non-Accruing [Member] | Commercial, Financial, And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	35,470,000			85,803,000
30-89 Days Past Due	13,202,000			5,867,000
90+ Days Past Due	105,401,000			121,681,000
Total Non-Accruing	154,073,000			213,351,000
Non-Accruing [Member] | Commercial, Financial, And Industrial [Member] | General C&I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	35,470,000			85,803,000
30-89 Days Past Due	13,202,000			5,867,000
90+ Days Past Due	30,608,000			58,623,000
Total Non-Accruing	79,280,000			150,293,000
Non-Accruing [Member] | Commercial, Financial, And Industrial [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
90+ Days Past Due				821,000
Total Non-Accruing				821,000
Non-Accruing [Member] | Commercial, Financial, And Industrial [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
90+ Days Past Due	74,793,000	[3]		62,237,000	[4]
Total Non-Accruing	74,793,000	[3]		62,237,000	[4]
Non-Accruing [Member] | Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	37,919,000			28,540,000
30-89 Days Past Due	7,987,000			2,786,000
90+ Days Past Due	15,421,000			8,759,000
Total Non-Accruing	61,327,000			40,085,000
Non-Accruing [Member] | Consumer Real Estate Portfolio Segment [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	26,822,000	[5]		11,179,000	[5]
30-89 Days Past Due	6,426,000	[5]		1,087,000	[5]
90+ Days Past Due	8,901,000	[5]		7,441,000	[5]
Total Non-Accruing	42,149,000	[5]		19,707,000	[5]
Non-Accruing [Member] | Consumer Real Estate Portfolio Segment [Member] | R/E Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	11,097,000			17,361,000
30-89 Days Past Due	1,561,000			1,699,000
90+ Days Past Due	6,520,000			1,318,000
Total Non-Accruing	19,178,000			20,378,000
Non-Accruing [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	46,247,000			66,340,000
30-89 Days Past Due	5,414,000			15,619,000
90+ Days Past Due	61,785,000			152,073,000
Total Non-Accruing	113,446,000			234,032,000
Non-Accruing [Member] | Commercial Real Estate [Member] | Income CRE [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	23,289,000			35,308,000
30-89 Days Past Due	2,701,000			5,892,000
90+ Days Past Due	43,757,000			99,536,000
Total Non-Accruing	69,747,000			140,736,000
Non-Accruing [Member] | Commercial Real Estate [Member] | Residential CRE [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	22,958,000			31,032,000
30-89 Days Past Due	2,713,000			9,727,000
90+ Days Past Due	18,028,000			52,537,000
Total Non-Accruing	43,699,000			93,296,000
Non-Accruing [Member] | Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	14,401,000	[5]		29,650,000	[5]
30-89 Days Past Due	987,000	[5]		4,295,000	[5]
90+ Days Past Due	20,802,000	[5]		100,471,000	[5]
Total Non-Accruing	36,190,000	[5]		134,416,000	[5]
Non-Accruing [Member] | Credit Card & Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	4,000			7,000
90+ Days Past Due	2,135,000			15,257,000
Total Non-Accruing	2,139,000			15,264,000
Non-Accruing [Member] | Credit Card & Other [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	4,000			7,000
90+ Days Past Due	2,135,000			15,257,000
Total Non-Accruing	$ 2,139,000			$ 15,264,000

[1] Balances as of March 31, 2012 and 2011 include $20.1 million and $36.5 million of reserves, respectively, and $467.0 million and $672.4 million of balances in restricted consumer real estate loans and secured borrowings, respectively.

[2] Balances as of March 31, 2012 and 2011 include $5.4 million and $3.3 million of reserves, respectively, and $38.0 million and $49.9 million of balances in restricted permanent mortgage loans and secured borrowings, respectively.

[3] Includes LOCOM valuation allowance $34.2 million.

[4] Includes LOCOM valuation allowance of $35.6 million.

[5] Includes restricted real estate loans and secured borrowings.