BANK LOANS, NET (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Jun. 30, 2011		Jun. 30, 2010	Jun. 30, 2011		Jun. 30, 2010	Sep. 30, 2010
Receivables:
Number of loan portfolio segments	5			5
Held for sale and held for investment loan portfolios [Abstract]
Loans held for sale, net	$ 70,121	[1]		$ 70,121	[1]		$ 6,114	[1]
Loans held for investment, net:
Commercial loans	3,796,539			3,796,539			3,232,723
CRE construction loans	25,381			25,381			65,512
CRE loans	783,297			783,297			937,669
Residential mortgage loans	1,760,387			1,760,387			2,015,331
Consumer loans	5,897			5,897			23,940
Total loans held for investment	6,371,501			6,371,501			6,275,175
Net unearned income and deferred expenses	(43,728)			(43,728)			(39,276)
Total loans held for investment, net	6,327,773	[1],[2]		6,327,773	[1],[2]		6,235,899	[1]
Total loans held for sale and investment	6,397,894	[1]		6,397,894	[1]		6,242,013	[1]
Allowance for loan losses	(145,800)			(145,800)			(147,084)
Bank loans, net	6,252,094			6,252,094			6,094,929
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for sale, net (in hundredths)	1.00%			1.00%			0.00%
Commercial loans (in hundredths)	59.00%			59.00%			52.00%
CRE construction loans (in hundredths)	0.00%			0.00%			1.00%
CRE loans (in hundredths)	12.00%			12.00%			15.00%
Residential mortgage loans (in hundredths)	28.00%			28.00%			32.00%
Consumer loans (in hundredths)	0.00%			0.00%			0.00%
Total loans held for sale and investment (in hundredths)	100.00%			100.00%			100.00%
Net gain from the sale of loans held for sale	74		20	648		260
Purchases and sales of any loans held for investment by portfolio segment [Abstract]
Purchases	21,295			68,648
Sales	38,545			54,424
Loans held for investment [Member] | Commercial loans [Member]
Purchases and sales of any loans held for investment by portfolio segment [Abstract]
Purchases	16,500			23,430
Sales	38,545			54,424
Loans held for investment [Member] | CRE loans [Member]
Purchases and sales of any loans held for investment by portfolio segment [Abstract]
Purchases	4,650			4,650
Sales	0			0
Loans held for investment [Member] | Residential mortgage loans [Member]
Purchases and sales of any loans held for investment by portfolio segment [Abstract]
Purchases	145			40,568
Sales	$ 0			$ 0

[1] Net of unearned income and deferred expenses, which includes purchase premiums, purchase discounts, and net deferred origination fees and costs

[2] Net of unearned income and deferred expenses.