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FAIR VALUE OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Level 1 |  |
Available-for-sale debt securities [Abstract] |  |
Total debt securities AFS | $ 0 | $ 0
Common equities and mutual funds | 4,286 | 3,378
Level 2 |  |
Available-for-sale debt securities [Abstract] |  |
Total debt securities AFS | 1,725,460 | 1,804,228
Common equities and mutual funds | 0 | 0
Level 3 |  |
Available-for-sale debt securities [Abstract] |  |
Total debt securities AFS | 0 | 0
Common equities and mutual funds | 0 | 0
Recurring |  |
Available-for-sale debt securities [Abstract] |  |
Corporate securities | 19,625 | 18,250
SBA securities | 83,571 | 85,242
Obligations of states and political subdivisions | 466 | 2,289
Non-bank qualified obligations of states and political subdivisions | 216,167 | 226,723
Asset-backed securities | 207,160 | 246,199
Mortgage-backed securities | 1,198,471 | 1,225,525
Total debt securities AFS | 1,725,460 | 1,804,228
Common equities and mutual funds | 4,286 | 3,378
Non-marketable equity securities | 10,495 | 8,389
Recurring | Level 1 |  |
Available-for-sale debt securities [Abstract] |  |
Corporate securities | 0 | 0
SBA 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 AFS | 0 | 0
Common equities and mutual funds | 4,286 | 3,378
Non-marketable equity securities | 0 | 0
Recurring | Level 2 |  |
Available-for-sale debt securities [Abstract] |  |
Corporate securities | 19,625 | 18,250
SBA securities | 83,571 | 85,242
Obligations of states and political subdivisions | 466 | 2,289
Non-bank qualified obligations of states and political subdivisions | 216,167 | 226,723
Asset-backed securities | 207,160 | 246,199
Mortgage-backed securities | 1,198,471 | 1,225,525
Total debt securities AFS | 1,725,460 | 1,804,228
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 0 | 0
Recurring | Level 3 |  |
Available-for-sale debt securities [Abstract] |  |
Corporate securities | 0 | 0
SBA 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 AFS | 0 | 0
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | $ 0 | $ 0

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