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FAIR VALUES OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Financial assets [Abstract]    
Debt securities available for sale $ 1,272,493 $ 1,852,025
Debt securities held to maturity 133,470 160,563
Investment securities available for sale, at fair value 1,900  
Loans held for sale 148,777 15,606
Level 1    
Financial assets [Abstract]    
Cash and cash equivalents 126,545 99,977
Debt securities available for sale 0 3,800
Debt securities held to maturity 0 0
Investment securities available for sale, at fair value 2,606  
Non-marketable equity securities 0  
Loans held for sale 0 0
Loans receivable: [Abstract]    
Impaired Loans, Net 0 0
Federal Home Loan Bank stock 0 0
Accrued interest receivable 20,400 22,016
Financial liabilities [Abstract]    
Deposits 2,920,516 2,718,005
Overnight federal funds purchased 642,000 422,000
Federal Home Loan Bank advances 0  
Other short- and long-term borrowings 0 0
Accrued interest payable 9,414 7,794
Level 2    
Financial assets [Abstract]    
Cash and cash equivalents 0 0
Debt securities available for sale 1,272,493 1,848,225
Debt securities held to maturity 133,470 160,974
Investment securities available for sale, at fair value 0  
Non-marketable equity securities 6,500  
Loans held for sale 148,777 15,606
Loans receivable: [Abstract]    
Impaired Loans, Net 0 0
Federal Home Loan Bank stock 30,916 23,400
Accrued interest receivable 0 0
Financial liabilities [Abstract]    
Deposits 1,417,994 1,705,946
Overnight federal funds purchased 0 0
Federal Home Loan Bank advances 110,691  
Other short- and long-term borrowings 113,876 94,999
Accrued interest payable 0 0
Level 3    
Financial assets [Abstract]    
Cash and cash equivalents 0 0
Debt securities available for sale 0 0
Debt securities held to maturity 0 0
Investment securities available for sale, at fair value 0  
Non-marketable equity securities 0  
Loans held for sale 0 0
Loans receivable: [Abstract]    
Impaired Loans, Net 3,622,597 2,927,755
Federal Home Loan Bank stock 0 0
Accrued interest receivable 0 0
Financial liabilities [Abstract]    
Deposits 0 0
Overnight federal funds purchased 0 0
Federal Home Loan Bank advances 0  
Other short- and long-term borrowings 0 0
Accrued interest payable 0 0
Carrying Amount    
Financial assets [Abstract]    
Cash and cash equivalents 126,545 99,977
Debt securities available for sale 1,272,493 1,852,025
Debt securities held to maturity 134,764 172,154
Investment securities available for sale, at fair value 2,606  
Non-marketable equity securities 8,169  
Loans held for sale 148,777 15,606
Loans receivable: [Abstract]    
Impaired Loans, Net 3,651,413 2,944,989
Federal Home Loan Bank stock 30,916 23,400
Accrued interest receivable 20,400 22,016
Financial liabilities [Abstract]    
Deposits 4,337,005 4,430,987
Overnight federal funds purchased 642,000 422,000
Federal Home Loan Bank advances 110,000  
Other short- and long-term borrowings 109,857 92,722
Accrued interest payable 9,414 7,794
Estimated Fair Value    
Financial assets [Abstract]    
Cash and cash equivalents 126,545 99,977
Debt securities available for sale 1,272,493 1,852,025
Debt securities held to maturity 133,470 160,974
Investment securities available for sale, at fair value 2,606  
Non-marketable equity securities 8,169  
Loans held for sale 148,777 15,606
Loans receivable: [Abstract]    
Impaired Loans, Net 3,622,597 2,927,755
Federal Home Loan Bank stock 30,916 23,400
Accrued interest receivable 20,400 22,016
Financial liabilities [Abstract]    
Deposits 4,338,510 4,423,951
Overnight federal funds purchased 642,000 422,000
Federal Home Loan Bank advances 110,691  
Other short- and long-term borrowings 113,876 94,999
Accrued interest payable $ 9,414 $ 7,794