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FAIR VALUE OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Sep. 30, 2025
--- | --- | ---
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 1,271,353 | $ 1,327,843
Level 1 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Common equities and mutual funds | 4,615 | 3,787
Level 2 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Common equities and mutual funds | 0 | 0
Level 3 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Common equities and mutual funds | 0 | 0
SBA securities |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 10,333 | 10,769
Obligations of states and political subdivisions |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 165 | 162
Non-bank qualified obligations of states and political subdivisions |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 175,797 | 187,040
Asset-backed securities |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 127,999 | 136,372
Mortgage-backed securities |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 935,559 | 972,250
Recurring |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 1,271,353 | 1,327,843
Common equities and mutual funds | 4,615 | 3,787
Non-marketable equity securities | 13,640 | 13,237
Recurring | Level 1 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Common equities and mutual funds | 4,615 | 3,787
Non-marketable equity securities | 0 | 0
Recurring | Level 2 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 1,271,353 | 1,327,843
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 0 | 0
Recurring | Level 3 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 0 | 0
Recurring | Corporate securities |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 21,500 | 21,250
Recurring | Corporate securities | Level 1 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring | Corporate securities | Level 2 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 21,500 | 21,250
Recurring | Corporate securities | Level 3 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring | SBA securities |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 10,333 | 10,769
Recurring | SBA securities | Level 1 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring | SBA securities | Level 2 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 10,333 | 10,769
Recurring | SBA securities | Level 3 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring | Obligations of states and political subdivisions |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 165 | 162
Recurring | Obligations of states and political subdivisions | Level 1 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring | Obligations of states and political subdivisions | Level 2 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 165 | 162
Recurring | Obligations of states and political subdivisions | Level 3 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring | Non-bank qualified obligations of states and political subdivisions |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 175,797 | 187,040
Recurring | Non-bank qualified obligations of states and political subdivisions | Level 1 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring | Non-bank qualified obligations of states and political subdivisions | Level 2 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 175,797 | 187,040
Recurring | Non-bank qualified obligations of states and political subdivisions | Level 3 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring | Asset-backed securities |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 127,999 | 136,372
Recurring | Asset-backed securities | Level 1 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring | Asset-backed securities | Level 2 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 127,999 | 136,372
Recurring | Asset-backed securities | Level 3 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring | Mortgage-backed securities |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 935,559 | 972,250
Recurring | Mortgage-backed securities | Level 1 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring | Mortgage-backed securities | Level 2 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 935,559 | 972,250
Recurring | Mortgage-backed securities | Level 3 |  |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 0 | $ 0

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