Loans (Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade) (Details) (USD $)	Sep. 30, 2011		Sep. 30, 2010
Participating Mortgage Loans [Line Items]
Total loans individually evaluated for impairment	$ 502,359,000		$ 602,119,000
Total loans collectively evaluated for impairment	15,739,043,000		16,457,370,000
Total commercial loans	9,134,000,000
PD Grade 1 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	164,000,000
PD Grade 1 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	164,000,000
PD Grade 2 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	152,000,000
PD Grade 2 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	149,000,000
PD Grade 2 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	3,000,000
PD Grade 3 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	200,000,000
PD Grade 3 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	183,000,000
PD Grade 3 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	17,000,000
PD Grade 4 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	189,000,000
PD Grade 4 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	182,000,000
PD Grade 4 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	7,000,000
PD Grade 5 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	364,000,000
PD Grade 5 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	334,000,000
PD Grade 5 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	30,000,000
PD Grade 6 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	1,243,000,000
PD Grade 6 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	884,000,000
PD Grade 6 [Member] | Loans To Mortgage Companies [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	277,000,000
PD Grade 6 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	79,000,000
PD Grade 6 [Member] | Residential CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	3,000,000
PD Grade 7 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	1,342,000,000
PD Grade 7 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	856,000,000
PD Grade 7 [Member] | Loans To Mortgage Companies [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	344,000,000
PD Grade 7 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	140,000,000
PD Grade 7 [Member] | Residential CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	2,000,000
PD Grade 8 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	1,600,000,000
PD Grade 8 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	1,097,000,000
PD Grade 8 [Member] | Loans To Mortgage Companies [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	314,000,000
PD Grade 8 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	185,000,000
PD Grade 8 [Member] | Residential CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	4,000,000
PD Grade 9 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	788,000,000
PD Grade 9 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	576,000,000
PD Grade 9 [Member] | Loans To Mortgage Companies [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	92,000,000
PD Grade 9 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	116,000,000
PD Grade 9 [Member] | Residential CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	4,000,000
PD Grade 10 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	568,000,000
PD Grade 10 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	404,000,000
PD Grade 10 [Member] | Loans To Mortgage Companies [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	39,000,000
PD Grade 10 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	124,000,000
PD Grade 10 [Member] | Residential CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	1,000,000
PD Grade 11 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	607,000,000
PD Grade 11 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	480,000,000
PD Grade 11 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	125,000,000
PD Grade 11 [Member] | Residential CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	2,000,000
PD Grade 12 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	149,000,000
PD Grade 12 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	128,000,000
PD Grade 12 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	16,000,000
PD Grade 12 [Member] | Residential CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	5,000,000
TRUPs [Member] | PD Grade 13 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	334,000,000	[1]
PD Grade 13 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	795,000,000
PD Grade 13 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	340,000,000
PD Grade 13 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	113,000,000
PD Grade 13 [Member] | Residential CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	8,000,000
TRUPs [Member] | PD Grade 14,15,16 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	4,000,000	[1]
PD Grade 14,15,16 [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	632,000,000
PD Grade 14,15,16 [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	313,000,000
PD Grade 14,15,16 [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	252,000,000
PD Grade 14,15,16 [Member] | Residential CRE [Member]
Participating Mortgage Loans [Line Items]
Commercial loan, Disaggregated by PD grade	63,000,000
TRUPs [Member] | Commercial Loan [Member]
Participating Mortgage Loans [Line Items]
Total loans individually evaluated for impairment	84,000,000	[1]
Total loans collectively evaluated for impairment	338,000,000	[1]
Commercial Loan [Member]
Participating Mortgage Loans [Line Items]
Total loans individually evaluated for impairment	341,000,000
Total loans collectively evaluated for impairment	8,793,000,000
Commercial Loan [Member] | General C&I [Member]
Participating Mortgage Loans [Line Items]
Total loans individually evaluated for impairment	127,000,000
Total loans collectively evaluated for impairment	6,090,000,000
Commercial Loan [Member] | Loans To Mortgage Companies [Member]
Participating Mortgage Loans [Line Items]
Total loans collectively evaluated for impairment	1,066,000,000
Commercial Loan [Member] | Income CRE [Member]
Participating Mortgage Loans [Line Items]
Total loans individually evaluated for impairment	80,000,000
Total loans collectively evaluated for impairment	1,207,000,000
Commercial Loan [Member] | Residential CRE [Member]
Participating Mortgage Loans [Line Items]
Total loans individually evaluated for impairment	50,000,000
Total loans collectively evaluated for impairment	92,000,000
General C&I [Member]
Participating Mortgage Loans [Line Items]
Total commercial loans	6,217,000,000
Loans To Mortgage Companies [Member]
Participating Mortgage Loans [Line Items]
Total commercial loans	1,066,000,000
TRUPs [Member]
Participating Mortgage Loans [Line Items]
Total commercial loans	422,000,000	[1]
LOCOM valuation allowance	35,300,000		35,600,000
Income CRE [Member]
Participating Mortgage Loans [Line Items]
Total commercial loans	1,287,000,000
Residential CRE [Member]
Participating Mortgage Loans [Line Items]
Total commercial loans	$ 142,000,000

[1] Presented net of $35.3 million a lower of cost or market ("LOCOM") valuation allowance. Based on the underlying structure of the notes, the highest possible internal grade is "13". Portfolio reserve estimate considers recent financial performance of individual borrowers and other factors.