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SECURITIES SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Oct. 01, 2018
Debt Securities, Available-for-sale [Line Items]          
Equity Securities, FV-NI, Cost   $ 1,800      
Investment securities available for sale, at fair value   1,900      
Proceeds from sales $ 260,000 755,616 $ 596,758 $ 457,306  
Securities pledged as collateral for public funds on deposit 8,000 21,900 8,000    
Securities pledged as collateral for individual, trust, and estate deposits 5,900 4,800 5,900    
Federal Home Loan Bank Stock, at cost 23,400 30,916 23,400    
Pledged securities against specific FHLB advances, fair value 1,060,000 812,200 1,060,000    
Loans pledged as collateral $ 756,000 928,800 756,000    
Federal Home Loan Bank          
Debt Securities, Available-for-sale [Line Items]          
Interest and dividend income from FLHB   $ 1,000 $ 1,100 $ 500  
Retained Earnings | Accounting Standards Update 2016-01          
Debt Securities, Available-for-sale [Line Items]          
Cumulative effect of new accounting principle in period of adoption         $ 475