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FAIR VALUE OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Available-for-sale debt securities [Abstract] |  |
Mortgage-backed securities | $ 355,094 | $ 382,546
Debt securities available for sale | 1,195,619 | 1,272,493
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Total held to maturity securities | 114,405 | 133,470
Level 1 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0 | 0
Available-for-sale debt securities [Abstract] |  |
Debt securities available for sale | 0 | 0
Common equities and mutual funds | 2,899 | 2,606
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Total held to maturity securities | 0 | 0
Level 2 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0 | 0
Available-for-sale debt securities [Abstract] |  |
Debt securities available for sale | 1,195,619 | 1,272,493
Common equities and mutual funds | 0 | 0
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Total held to maturity securities | 114,405 | 133,470
Level 3 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 3,606,603 | 3,622,597
Available-for-sale debt securities [Abstract] |  |
Debt securities available for sale | 0 | 0
Common equities and mutual funds | 0 | 0
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Total held to maturity securities | 0 | 0
Nonrecurring |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 20,823 | 38,201
Nonrecurring | Level 1 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0 | 0
Nonrecurring | Level 2 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0 | 0
Nonrecurring | Level 3 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 20,823 | 38,201
Recurring |  |
Available-for-sale debt securities [Abstract] |  |
Small business administration securities | 173,246 | 185,982
Obligations of states and political subdivisions | 872 | 874
Non-bank qualified obligations of states and political subdivisions | 346,170 | 400,557
Asset-baked securities | 320,237 | 302,534
Mortgage-backed securities | 355,094 | 382,546
Debt securities available for sale | 1,195,619 | 1,272,493
Common equities and mutual funds | 2,899 | 2,606
Non-marketable equity securities | 2,532 | 1,669
Recurring | Level 1 |  |
Available-for-sale debt securities [Abstract] |  |
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-baked securities | 0 | 0
Mortgage-backed securities | 0 | 0
Debt securities available for sale | 0 | 0
Common equities and mutual funds | 2,899 | 2,606
Non-marketable equity securities | 0 | 0
Recurring | Level 2 |  |
Available-for-sale debt securities [Abstract] |  |
Small business administration securities | 173,246 | 185,982
Obligations of states and political subdivisions | 872 | 874
Non-bank qualified obligations of states and political subdivisions | 346,170 | 400,557
Asset-baked securities | 320,237 | 302,534
Mortgage-backed securities | 355,094 | 382,546
Debt securities available for sale | 1,195,619 | 1,272,493
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 0 | 0
Recurring | Level 3 |  |
Available-for-sale debt securities [Abstract] |  |
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-baked securities | 0 | 0
Mortgage-backed securities | 0 | 0
Debt securities available for sale | 0 | 0
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 0 | 0
Commercial Portfolio Segment | Nonrecurring |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 13,489 | 8,707
Commercial Portfolio Segment | Nonrecurring | Level 1 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0 | 0
Commercial Portfolio Segment | Nonrecurring | Level 2 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0 | 0
Commercial Portfolio Segment | Nonrecurring | Level 3 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | $ 13,489 | $ 8,707

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