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BANK LOANS, NET, Originations, Purchases, and Sales (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Loans held for sale      
Payments for Origination and Purchases of Loans Held-for-sale [Abstract]      
Loans held for sale purchased or originated $ 1,200,000 $ 1,000,000 $ 1,300,000
Proceeds from Sale of Loans Held-for-sale [Abstract]      
Proceeds for sale of loans held for sale 213,000 189,000 300,000
Gain on sales of loans, net 1,700 800 3,600
Unrealized loss on loans held for sale 400 400 2,900
Loans held for investment      
Purchases and sales of loans held for investment by portfolio segment [Abstract]      
Purchases 1,013,232 570,834 389,975
Sales 108,983 219,914 176,186
Loans held for investment | C&I loans      
Purchases and sales of loans held for investment by portfolio segment [Abstract]      
Purchases 792,921 536,167 358,309
Sales 108,983 219,914 176,186
Loans held for investment | CRE      
Purchases and sales of loans held for investment by portfolio segment [Abstract]      
Purchases 0 5,000 5,048
Sales 0 0 0
Loans held for investment | Residential mortgage loans      
Purchases and sales of loans held for investment by portfolio segment [Abstract]      
Purchases 220,311 29,667 26,618
Sales 0 $ 0 $ 0
Financing receivable, significant purchase in one portfolio $ 207,300