BANK LOANS, NET, Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2009
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of year	$ 147,084		$ 150,272		$ 88,155
Provision for loan losses	33,655		80,413		169,341
Net charge-offs:
Charge-offs	(38,418)		(87,239)		(107,853)
Recoveries	3,423		3,638		629
Net charge-offs	(34,995)		(83,601)		(107,224)
Balance at end of period	145,744		147,084		150,272
Allowance for loan losses:
Individually evaluated for impairment	12,134		11,281
Collectively evaluated for impairment	133,610		135,803
Total allowance for loan losses	145,744		147,084		150,272
Loan category as a % of total recorded investment (in hundredths)	100.00%		100.00%
Recorded investment:
Individually evaluated for impairment	64,980	[1]	83,201	[1]
Collectively evaluated for impairment	6,664,607	[1]	6,197,821	[1]
Total recorded investment	6,729,587	[1]	6,281,022	[1]
Reserve for unfunded lending commitments [Abstract]
Reserve for unfunded lending commitments	10,400		11,900
Loans held for sale [Member]
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of year	23		7		1
Provision for loan losses	(18)		16		6
Net charge-offs:
Charge-offs	0		0		0
Recoveries	0		0		0
Net charge-offs	0		0		0
Balance at end of period	5		23		7
Allowance for loan losses:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	5		23
Total allowance for loan losses	5		23		7
Loan category as a % of total recorded investment (in hundredths)	2.00%		0.00%
Recorded investment:
Individually evaluated for impairment	0	[1]	0	[1]
Collectively evaluated for impairment	92,748	[1]	5,847	[1]
Total recorded investment	92,748	[1]	5,847	[1]
Loans held for investment [Member] | C&I loans [Member]
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of year	60,464		84,841		55,106
Provision for loan losses	21,261		(24,377)		29,735
Net charge-offs:
Charge-offs	(458)		0		0
Recoveries	0		0		0
Net charge-offs	(458)		0		0
Balance at end of period	81,267		60,464		84,841
Allowance for loan losses:
Individually evaluated for impairment	8,478		0
Collectively evaluated for impairment	72,789		60,464
Total allowance for loan losses	81,267		60,464		84,841
Loan category as a % of total recorded investment (in hundredths)	61.00%		52.00%
Recorded investment:
Individually evaluated for impairment	25,685	[1]	0	[1]
Collectively evaluated for impairment	4,075,254	[1]	3,232,723	[1]
Total recorded investment	4,100,939	[1]	3,232,723	[1]
Loans held for investment [Member] | CRE construction [Member]
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of year	4,473		3,237		7,061
Provision for loan losses	(3,983)		1,236		(602)
Net charge-offs:
Charge-offs	0		0		(3,222)
Recoveries	0		0		0
Net charge-offs	0		0		(3,222)
Balance at end of period	490		4,473		3,237
Allowance for loan losses:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	490		4,473
Total allowance for loan losses	490		4,473		3,237
Loan category as a % of total recorded investment (in hundredths)	0.00%		1.00%
Recorded investment:
Individually evaluated for impairment	0	[1]	0	[1]
Collectively evaluated for impairment	29,087	[1]	65,512	[1]
Total recorded investment	29,087	[1]	65,512	[1]
Loans held for investment [Member] | CRE [Member]
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of year	47,771		34,018		17,238
Provision for loan losses	(3,485)		67,806		94,096
Net charge-offs:
Charge-offs	(15,204)		(56,402)		(77,317)
Recoveries	1,670		2,349		1
Net charge-offs	(13,534)		(54,053)		(77,316)
Balance at end of period	30,752		47,771		34,018
Allowance for loan losses:
Individually evaluated for impairment	1,014		8,469
Collectively evaluated for impairment	29,738		39,302
Total allowance for loan losses	30,752		47,771		34,018
Loan category as a % of total recorded investment (in hundredths)	11.00%		15.00%
Recorded investment:
Individually evaluated for impairment	15,842	[1]	67,071	[1]
Collectively evaluated for impairment	727,047	[1]	870,598	[1]
Total recorded investment	742,889	[1]	937,669	[1]
Loans held for investment [Member] | Residential mortgage [Member]
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of year	34,297		28,081		8,588
Provision for loan losses	19,670		35,764		46,179
Net charge-offs:
Charge-offs	(22,501)		(30,837)		(27,314)
Recoveries	1,744		1,289		628
Net charge-offs	(20,757)		(29,548)		(26,686)
Balance at end of period	33,210		34,297		28,081
Allowance for loan losses:
Individually evaluated for impairment	2,642		2,812
Collectively evaluated for impairment	30,568		31,485
Total allowance for loan losses	33,210		34,297		28,081
Loan category as a % of total recorded investment (in hundredths)	26.00%		32.00%
Recorded investment:
Individually evaluated for impairment	23,453	[1]	16,130	[1]
Collectively evaluated for impairment	1,733,033	[1]	1,999,201	[1]
Total recorded investment	1,756,486	[1]	2,015,331	[1]
Loans held for investment [Member] | Consumer [Member]
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of year	56		88		162
Provision for loan losses	210		(32)		(74)
Net charge-offs:
Charge-offs	(255)		0		0
Recoveries	9		0		0
Net charge-offs	(246)		0		0
Balance at end of period	20		56		88
Allowance for loan losses:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	20		56
Total allowance for loan losses	20		56		88
Loan category as a % of total recorded investment (in hundredths)	0.00%		0.00%
Recorded investment:
Individually evaluated for impairment	0	[1]	0	[1]
Collectively evaluated for impairment	7,438	[1]	23,940	[1]
Total recorded investment	$ 7,438	[1]	$ 23,940	[1]

[1] Excludes any net unearned income and deferred expenses.