BANK LOANS, NET, Originations, Purchases, and Sales (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Impaired financing receivable, interest income recognized	$ 200	$ 400	$ 500	$ 600
Loans held for sale
Payments for Origination and Purchases of Loans Held-for-sale [Abstract]
Loans held for sale originated or purchased	397,500	219,700	1,000,000	617,600
Proceeds from Sale of Loans Held-for-sale [Abstract]
Proceeds from sale of loans held-for-sale	84,700	60,200	170,900	97,500
Gain (loss) of loans held-for-sale	300		600
Loans held for investment
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	230,084	107,534	366,970	473,590
Sales	36,569	25,500	71,815	32,360
Loans held for investment \| C&I loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	91,256	106,197	149,107	260,281
Sales	36,569	25,500	71,815	32,360
Loans held for investment \| CRE
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	7,040	0	7,040	0
Sales	0	0	0	0
Loans held for investment \| Residential mortgage loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	131,788	1,337	210,823	213,309
Sales	0	$ 0	0	0
Significant purchase in one portfolio	$ 107,100		$ 179,600	$ 207,300

Financing Receivable, Significant Purchase in One Portfolio

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The interest income recognized during the time within that period that the financing receivables were impaired.

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The amount of any significant purchases of financing receivables during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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The amount of any significant sales of financing receivables during the reporting period.

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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 225
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-Subparagraph (SX 210.7-04.3(a))
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The aggregate amount of cash outflow for loans purchased and created with the intention to resell them in the near future.

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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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-Publisher FASB
-Name Accounting Standards Codification
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