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SECURITIES SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]          
Investment securities held to maturity $ (164,304) $ (164,304) $ (449,840)    
Mortgage-backed securities held to maturity (7,850) (7,850) (113,689)    
Proceeds from sale of lower-yielding AFS securities 260,000 596,758 457,306 $ 285,508  
Securities pledged as collateral for public funds on deposit 8,000 8,000 5,700    
Securities pledged as collateral for individual, trust, and estate deposits 5,900 5,900 3,800    
Federal Home Loan Bank stock, at cost 23,400 23,400 61,123    
Pledged securities against specific FHLB advances, fair value 1,060,000 1,060,000 1,070,000    
Loans pledged as collateral 756,000 756,000 628,000    
Accounting Standards Update 2017-12 [Member]          
Debt Securities, Available-for-sale [Line Items]          
Investment securities held to maturity $ 40,900 40,900     $ 204,700
Mortgage-backed securities held to maturity         $ 101,300
Federal Home Loan Bank [Member]          
Debt Securities, Available-for-sale [Line Items]          
Interest and dividend income from FLHB   $ 1,100 $ 500 $ 600