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FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Debt securities AFS |  |
Fair Value | $ 1,327,843 | $ 1,741,221
SBA securities |  |
Debt securities AFS |  |
Fair Value | 10,769 | 81,935
Obligations of states and political subdivisions |  |
Debt securities AFS |  |
Fair Value | 162 | 480
Non-bank qualified obligations of states and political subdivisions |  |
Debt securities AFS |  |
Fair Value | 187,040 | 217,990
Asset-backed securities |  |
Debt securities AFS |  |
Fair Value | 136,372 | 189,698
Mortgage-backed securities |  |
Debt securities AFS |  |
Fair Value | 972,250 | 1,231,368
Level 1 |  |
Debt securities AFS |  |
Common equities and mutual funds | 3,787 | 3,303
Level 2 |  |
Debt securities AFS |  |
Common equities and mutual funds | 0 | 0
Level 3 |  |
Debt securities AFS |  |
Common equities and mutual funds | 0 | 0
Recurring |  |
Debt securities AFS |  |
Fair Value | 1,327,843 | 1,741,221
Common equities and mutual funds | 3,787 | 3,303
Non-marketable equity securities | 13,237 | 11,828
Recurring | Corporate securities |  |
Debt securities AFS |  |
Fair Value | 21,250 | 19,750
Recurring | SBA securities |  |
Debt securities AFS |  |
Fair Value | 10,769 | 81,935
Recurring | Obligations of states and political subdivisions |  |
Debt securities AFS |  |
Fair Value | 162 | 480
Recurring | Non-bank qualified obligations of states and political subdivisions |  |
Debt securities AFS |  |
Fair Value | 187,040 | 217,990
Recurring | Asset-backed securities |  |
Debt securities AFS |  |
Fair Value | 136,372 | 189,698
Recurring | Mortgage-backed securities |  |
Debt securities AFS |  |
Fair Value | 972,250 | 1,231,368
Recurring | Level 1 |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Common equities and mutual funds | 3,787 | 3,303
Non-marketable equity securities | 0 | 0
Recurring | Level 1 | Corporate securities |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Recurring | Level 1 | SBA securities |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Recurring | Level 1 | Obligations of states and political subdivisions |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Recurring | Level 1 | Non-bank qualified obligations of states and political subdivisions |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Recurring | Level 1 | Asset-backed securities |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Recurring | Level 1 | Mortgage-backed securities |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Recurring | Level 2 |  |
Debt securities AFS |  |
Fair Value | 1,327,843 | 1,741,221
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 0 | 0
Recurring | Level 2 | Corporate securities |  |
Debt securities AFS |  |
Fair Value | 21,250 | 19,750
Recurring | Level 2 | SBA securities |  |
Debt securities AFS |  |
Fair Value | 10,769 | 81,935
Recurring | Level 2 | Obligations of states and political subdivisions |  |
Debt securities AFS |  |
Fair Value | 162 | 480
Recurring | Level 2 | Non-bank qualified obligations of states and political subdivisions |  |
Debt securities AFS |  |
Fair Value | 187,040 | 217,990
Recurring | Level 2 | Asset-backed securities |  |
Debt securities AFS |  |
Fair Value | 136,372 | 189,698
Recurring | Level 2 | Mortgage-backed securities |  |
Debt securities AFS |  |
Fair Value | 972,250 | 1,231,368
Recurring | Level 3 |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 0 | 0
Recurring | Level 3 | Corporate securities |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Recurring | Level 3 | SBA securities |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Recurring | Level 3 | Obligations of states and political subdivisions |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Recurring | Level 3 | Non-bank qualified obligations of states and political subdivisions |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Recurring | Level 3 | Asset-backed securities |  |
Debt securities AFS |  |
Fair Value | 0 | 0
Recurring | Level 3 | Mortgage-backed securities |  |
Debt securities AFS |  |
Fair Value | $ 0 | $ 0

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