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FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($) | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Transfers between levels of fair value hierarchy | $ 0 | $ 0
Available For Sale |  |
Total debt securities | 364,065,000 | 586,454,000
Total securities | 1,852,025,000 | 1,693,431,000
Held To Maturity |  |
Total securities | 160,974,000 | 564,185,000
Fair value of assets measured on non-recurring basis [Abstract] |  |
Foreclosed real estate and repossessed assets | 31,638,000 | 292,000
Level 1 [Member] |  |
Available For Sale |  |
Total securities | 3,800,000 | 1,445,000
Held To Maturity |  |
Total securities | 0 | 0
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 | 0
Level 2 [Member] |  |
Available For Sale |  |
Total securities | 1,848,225,000 | 1,691,986,000
Held To Maturity |  |
Total securities | 160,974,000 | 564,185,000
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 | 0
Level 3 [Member] |  |
Available For Sale |  |
Total securities | 0 | 0
Held To Maturity |  |
Total securities | 0 | 0
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 2,927,755,000 | 1,318,402,000
Recurring [Member] |  |
Available For Sale |  |
Small business administration securities | 44,337,000 | 57,871,000
Obligations of states and political subdivisions | 16,910,000 | 0
Non-bank qualified obligations of states and political subdivisions | 1,109,885,000 | 950,829,000
Asset backed securities | 313,028,000 | 96,832,000
Mortgage-backed securities | 364,065,000 | 586,454,000
Total debt securities | 1,848,225,000 | 1,691,986,000
Common Equities and Mutual Funds, Available-for-Sale | 3,800,000 | 1,445,000
Total securities | 1,852,025,000 | 1,693,431,000
Held To Maturity |  |
Small business administration securities | 0 | 0
Obligations of states and political subdivisions | 0 | 19,368,000
Non-bank qualified obligations of states and political subdivisions | 153,546,000 | 432,361,000
Asset backed securities | 0 | 0
Mortgage-backed securities | 7,428,000 | 112,456,000
Total debt securities | 160,974,000 | 564,185,000
Common equities and mutual funds | 0 | 0
Total securities | 160,974,000 | 564,185,000
Recurring [Member] | Level 1 [Member] |  |
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 | 0 | 0
Total debt securities | 0 | 0
Common Equities and Mutual Funds, Available-for-Sale | 3,800,000 | 1,445,000
Total securities | 3,800,000 | 1,445,000
Held To Maturity |  |
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 | 0 | 0
Total debt securities | 0 | 0
Common equities and mutual funds | 0 | 0
Total securities | 0 | 0
Recurring [Member] | Level 2 [Member] |  |
Available For Sale |  |
Small business administration securities | 44,337,000 | 57,871,000
Obligations of states and political subdivisions | 16,910,000 | 0
Non-bank qualified obligations of states and political subdivisions | 1,109,885,000 | 950,829,000
Asset backed securities | 313,028,000 | 96,832,000
Mortgage-backed securities | 364,065,000 | 586,454,000
Total debt securities | 1,848,225,000 | 1,691,986,000
Common Equities and Mutual Funds, Available-for-Sale | 0 | 0
Total securities | 1,848,225,000 | 1,691,986,000
Held To Maturity |  |
Small business administration securities | 0 | 0
Obligations of states and political subdivisions | 0 | 19,368,000
Non-bank qualified obligations of states and political subdivisions | 153,546,000 | 432,361,000
Asset backed securities | 0 | 0
Mortgage-backed securities | 7,428,000 | 112,456,000
Total debt securities | 160,974,000 | 564,185,000
Common equities and mutual funds | 0 | 0
Total securities | 160,974,000 | 564,185,000
Recurring [Member] | Level 3 [Member] |  |
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 | 0 | 0
Total debt securities | 0 | 0
Common Equities and Mutual Funds, Available-for-Sale | 0 | 0
Total securities | 0 | 0
Held To Maturity |  |
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 | 0 | 0
Total debt securities | 0 | 0
Common equities and mutual funds | 0 | 0
Total securities | 0 | 0
Nonrecurring [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Total | 36,463,000 | 292,000
Nonrecurring [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 4,825,000 |
Nonrecurring [Member] | Foreclosed Assets, Net [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Foreclosed real estate and repossessed assets | 31,638,000 | 292,000
Nonrecurring [Member] | Level 1 [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Total | 0 | 0
Nonrecurring [Member] | Level 1 [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 |
Nonrecurring [Member] | Level 1 [Member] | Foreclosed Assets, Net [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Foreclosed real estate and repossessed assets | 0 | 0
Nonrecurring [Member] | Level 2 [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Total | 0 | 0
Nonrecurring [Member] | Level 2 [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 |
Nonrecurring [Member] | Level 2 [Member] | Foreclosed Assets, Net [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Foreclosed real estate and repossessed assets | 0 | 0
Nonrecurring [Member] | Level 3 [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Total | 36,463,000 | 292,000
Nonrecurring [Member] | Level 3 [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 4,825,000 |
Nonrecurring [Member] | Level 3 [Member] | Foreclosed Assets, Net [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Foreclosed real estate and repossessed assets | 31,638,000 | 292,000
Community Banking [Member] | Level 1 [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Level 1 [Member] | 1-4 Family Real Estate [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Level 1 [Member] | Commercial and Multi-Family Real Estate [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Level 2 [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Level 2 [Member] | 1-4 Family Real Estate [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Level 2 [Member] | Commercial and Multi-Family Real Estate [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Level 3 [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 1,076,782,000 | 920,439,000
Community Banking [Member] | Level 3 [Member] | 1-4 Family Real Estate [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 220,697,000 | 196,970,000
Community Banking [Member] | Level 3 [Member] | Commercial and Multi-Family Real Estate [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 731,291,000 | 576,330,000
Community Banking [Member] | Nonrecurring [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 4,825,000 |
Community Banking [Member] | Nonrecurring [Member] | Level 1 [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 |
Community Banking [Member] | Nonrecurring [Member] | Level 2 [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 |
Community Banking [Member] | Nonrecurring [Member] | Level 3 [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 4,825,000 |
National Lending [Member] | Level 1 [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 | 0
National Lending [Member] | Level 2 [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 | 0
National Lending [Member] | Level 3 [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 1,850,973,000 | $ 397,963,000
National Lending [Member] | Nonrecurring [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 4,825,000 |
National Lending [Member] | Nonrecurring [Member] | Level 1 [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 |
National Lending [Member] | Nonrecurring [Member] | Level 2 [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | 0 |
National Lending [Member] | Nonrecurring [Member] | Level 3 [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Impaired Loans, Net | $ 4,825,000 |

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