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SHORT TERM AND LONG TERM DEBT SHORT TERM AND LONG TERM DEBT - Short Term Debt (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
USD ($)
Lease
Sep. 30, 2015
USD ($)
Short-term Debt [Line Items]    
Short-term debt $ 1,095,118 $ 544,007
Fixed rate of FHLB advances 0.46%  
Pledged securities against specific FHLB advances, fair value $ 824,500 625,200
Qualified mortgage loans pledged as collateral $ 501,000 369,600
Number of capital leases | Lease 3  
Number of equipment leases | Lease 2  
Number of property leases | Lease 1  
Leases, current $ 79  
Leases expense in next twelve months 201  
Securities sold under agreements to repurchase, total 3,000 4,000
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]    
Highest month-end balance 3,468 17,400
Average balance $ 2,179 $ 10,883
Weighted average interest rate for the year 0.60% 0.52%
Weighted average interest rate at year end 0.61% 0.58%
Securities pledged as collateral for securities sold under agreement to repurchase, fair value $ 9,200 $ 20,600
Overnight federal funds purchased [Member]    
Short-term Debt [Line Items]    
Short-term debt 992,000 540,000
Short-term FHLB advances [Member]    
Short-term Debt [Line Items]    
Short-term debt 100,000 0
Short-term capital lease [Member]    
Short-term Debt [Line Items]    
Short-term debt 79 0
Repurchase agreements [Member]    
Short-term Debt [Line Items]    
Short-term debt $ 3,039 $ 4,007