BANK LOANS, NET, Credit Quality of Held for Investment Loan Portfolio (Details) (USD $) In Thousands	Jun. 30, 2011	Sep. 30, 2010
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	$ 6,371,501	$ 6,275,175
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	3,600,202
CRE Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	25,381
CRE [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	642,033
Residential Mortgage - First Mortgage [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,608,758
Residential Mortgage - Home Equity [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	30,718
Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	5,897
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	5,912,989
Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	89,144
CRE Construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	0
CRE [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	58,326
Residential Mortgage - First Mortgage [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	28,662
Residential Mortgage - Home Equity [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	176
Consumer [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	0
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	176,308
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	94,743
CRE Construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	0
CRE [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	76,790
Residential Mortgage - First Mortgage [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	91,789
Residential Mortgage - Home Equity [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	284
Consumer [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	0
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	263,606
Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	12,450
CRE Construction [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	0
CRE [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	6,148
Residential Mortgage - First Mortgage [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	0
Residential Mortgage - Home Equity [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	0
Consumer [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	0
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	18,598
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	3,796,539
CRE Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	25,381
CRE [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	783,297
Residential Mortgage - First Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,729,209
Residential Mortgage - Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	31,178
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	$ 5,897