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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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