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FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($)
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfers between levels of fair value hierarchy $ 0  
Available For Sale    
Mortgage-backed securities available for sale, at fair value 382,546,000 $ 364,065,000
Total debt securities 1,272,493,000 1,852,025,000
Held To Maturity    
Total securities 133,470,000 160,563,000
Fair value of assets measured on non-recurring basis [Abstract]    
Foreclosed real estate and repossessed assets 29,494,000 31,638,000
Level 1    
Available For Sale    
Total debt securities 0 3,800,000
Non-marketable equity securities 0  
Held To Maturity    
Total securities 0 0
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 0 0
Level 2    
Available For Sale    
Total debt securities 1,272,493,000 1,848,225,000
Non-marketable equity securities 6,500,000  
Held To Maturity    
Total securities 133,470,000 160,974,000
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 0 0
Level 3    
Available For Sale    
Total debt securities 0 0
Non-marketable equity securities 0  
Held To Maturity    
Total securities 0 0
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 3,622,597,000 2,927,755,000
Recurring    
Available For Sale    
Small business administration securities 185,982,000 44,337,000
Obligations of states and political subdivisions 874,000 16,910,000
Non-bank qualified obligations of states and political subdivisions 400,557,000 1,109,885,000
Asset backed securities 302,534,000 313,028,000
Mortgage-backed securities available for sale, at fair value 382,546,000 364,065,000
Total debt securities 1,272,493,000 1,848,225,000
Common equities and mutual funds 2,606,000 3,800,000
Non-marketable equity securities 1,669,000  
Total securities   1,852,025,000
Recurring | Level 1    
Available For Sale    
Small business administration securities 0 0
Obligations of states and political subdivisions 0 0
Non-bank qualified obligations of states and political subdivisions 0 0
Asset backed securities 0 0
Mortgage-backed securities available for sale, at fair value 0 0
Total debt securities 0 0
Common equities and mutual funds 2,606,000 3,800,000
Non-marketable equity securities 0  
Total securities   3,800,000
Recurring | Level 2    
Available For Sale    
Small business administration securities 185,982,000 44,337,000
Obligations of states and political subdivisions 874,000 16,910,000
Non-bank qualified obligations of states and political subdivisions 400,557,000 1,109,885,000
Asset backed securities 302,534,000 313,028,000
Mortgage-backed securities available for sale, at fair value 382,546,000 364,065,000
Total debt securities 1,272,493,000 1,848,225,000
Common equities and mutual funds 0 0
Non-marketable equity securities 0  
Total securities   1,848,225,000
Recurring | Level 3    
Available For Sale    
Small business administration securities 0 0
Obligations of states and political subdivisions 0 0
Non-bank qualified obligations of states and political subdivisions 0 0
Asset backed securities 0 0
Mortgage-backed securities available for sale, at fair value 0 0
Total debt securities 0 0
Common equities and mutual funds 0 0
Non-marketable equity securities 0  
Total securities   0
Nonrecurring    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   36,463,000
Total 38,201,000  
Nonrecurring | Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 8,707,000  
Nonrecurring | Total Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   4,825,000
Nonrecurring | Foreclosed Assets    
Fair value of assets measured on non-recurring basis [Abstract]    
Foreclosed real estate and repossessed assets 29,494,000 31,638,000
Nonrecurring | Commercial Portfolio Segment    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   4,825,000
Nonrecurring | National Lending    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   4,825,000
Nonrecurring | Level 1    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   0
Total 0  
Nonrecurring | Level 1 | Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 0  
Nonrecurring | Level 1 | Total Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   0
Nonrecurring | Level 1 | Foreclosed Assets    
Fair value of assets measured on non-recurring basis [Abstract]    
Foreclosed real estate and repossessed assets 0 0
Nonrecurring | Level 1 | Commercial Portfolio Segment    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   0
Nonrecurring | Level 1 | National Lending    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   0
Nonrecurring | Level 2    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   0
Total 0  
Nonrecurring | Level 2 | Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 0  
Nonrecurring | Level 2 | Total Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   0
Nonrecurring | Level 2 | Foreclosed Assets    
Fair value of assets measured on non-recurring basis [Abstract]    
Foreclosed real estate and repossessed assets 0 0
Nonrecurring | Level 2 | Commercial Portfolio Segment    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   0
Nonrecurring | Level 2 | National Lending    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   0
Nonrecurring | Level 3    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   36,463,000
Total 38,201,000  
Nonrecurring | Level 3 | Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 8,707,000  
Nonrecurring | Level 3 | Total Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   4,825,000
Nonrecurring | Level 3 | Foreclosed Assets    
Fair value of assets measured on non-recurring basis [Abstract]    
Foreclosed real estate and repossessed assets 29,494,000 31,638,000
Nonrecurring | Level 3 | Commercial Portfolio Segment    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   4,825,000
Nonrecurring | Level 3 | National Lending    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net   $ 4,825,000
Community Banking | Nonrecurring | Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 8,707,000  
Community Banking | Nonrecurring | Level 1 | Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 0  
Community Banking | Nonrecurring | Level 2 | Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 0  
Community Banking | Nonrecurring | Level 3 | Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 8,707,000  
National Lending | Nonrecurring | Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 8,707,000  
National Lending | Nonrecurring | Level 1 | Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 0  
National Lending | Nonrecurring | Level 2 | Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net 0  
National Lending | Nonrecurring | Level 3 | Impaired Loans    
Fair value of assets measured on non-recurring basis [Abstract]    
Impaired Loans, Net $ 8,707,000