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FAIR VALUE OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Level 1 |  |
Available-for-sale debt securities [Abstract] |  |
Total debt securities AFS | $ 0 | $ 0
Common equities and mutual funds | 4,207 | 3,378
Level 2 |  |
Available-for-sale debt securities [Abstract] |  |
Total debt securities AFS | 1,850,581 | 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 | 18,375 | 18,250
SBA securities | 87,732 | 85,242
Obligations of states and political subdivisions | 2,304 | 2,289
Non-bank qualified obligations of states and political subdivisions | 228,888 | 226,723
Asset-backed securities | 237,704 | 246,199
Mortgage-backed securities | 1,275,578 | 1,225,525
Total debt securities AFS | 1,850,581 | 1,804,228
Common equities and mutual funds | 4,207 | 3,378
Non-marketable equity securities | 9,700 | 8,389
Recurring | Level 1 |  |
Available-for-sale debt securities [Abstract] |  |
Corporate securities |  | 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 | 4,207 | 3,378
Non-marketable equity securities | 0 | 0
Recurring | Level 2 |  |
Available-for-sale debt securities [Abstract] |  |
Corporate securities | 18,375 | 18,250
SBA securities | 87,732 | 85,242
Obligations of states and political subdivisions | 2,304 | 2,289
Non-bank qualified obligations of states and political subdivisions | 228,888 | 226,723
Asset-backed securities | 237,704 | 246,199
Mortgage-backed securities | 1,275,578 | 1,225,525
Total debt securities AFS | 1,850,581 | 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
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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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents common equities and mutual funds as of the balance sheet date which have been categorized as available-for-sale. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents non-bank qualified obligations of states and political subdivision as of the balance sheet date which have been categorized as available-for-sale. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482736/825-10-45-1A + Details
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