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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, 2022 | Sep. 30, 2021
--- | --- | ---
Level 1 |  |
Available-for-sale debt securities [Abstract] |  |
Total debt securities AFS | $ 0 | $ 0
Common equities and mutual funds | 3,065 | 12,668
Level 2 |  |
Available-for-sale debt securities [Abstract] |  |
Total debt securities AFS | 1,956,523 | 1,864,899
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 | 23,438 | 25,000
SBA securities | 81,349 | 157,209
Obligations of states and political subdivisions | 2,641 | 2,507
Non-bank qualified obligations of states and political subdivisions | 244,961 | 268,295
Asset-backed securities | 159,332 | 394,859
Mortgage-backed securities | 1,444,802 | 1,017,029
Total debt securities AFS | 1,956,523 | 1,864,899
Common equities and mutual funds | 3,065 | 12,668
Non-marketable equity securities | 6,494 | 4,560
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 | 3,065 | 12,668
Non-marketable equity securities | 0 | 0
Recurring | Level 2 |  |
Available-for-sale debt securities [Abstract] |  |
Corporate securities | 23,438 | 25,000
SBA securities | 81,349 | 157,209
Obligations of states and political subdivisions | 2,641 | 2,507
Non-bank qualified obligations of states and political subdivisions | 244,961 | 268,295
Asset-backed securities | 159,332 | 394,859
Mortgage-backed securities | 1,444,802 | 1,017,029
Total debt securities AFS | 1,956,523 | 1,864,899
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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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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