BANK LOANS, NET, Credit Quality of Held for Investment Loan Portfolio (Details) (USD $) In Thousands	Sep. 30, 2011
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	$ 6,636,839
C&I loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	3,906,358
CRE construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	29,087
CRE [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	572,124
Residential mortgage - First mortgage [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,607,327
Residential mortgage - Home equity [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	30,319
Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	7,438
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	6,152,653
C&I loans [Member] | Special mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	88,889
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	76,021
Residential mortgage - First mortgage [Member] | Special mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	23,684
Residential mortgage - Home equity [Member] | Special mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	170
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	188,764
C&I loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	93,658
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	90,058
Residential mortgage - First mortgage [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	94,758
Residential mortgage - Home equity [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	228
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	278,702
C&I loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	12,034
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	4,686
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	16,720
C&I loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	4,100,939
CRE construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	29,087
CRE [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	742,889
Residential mortgage - First mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,725,769
Residential mortgage - Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	30,717
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	$ 7,438