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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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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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