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SECURITIES (Tables) | 6 Months Ended
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Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract] |
Securities Available for Sale | The amortized cost, gross unrealized gains and losses and estimated fair values of debt securities available for sale ("AFS") and held to maturity ("HTM") are presented below.
(Dollars in thousands) | Amortized Cost | Gross Unrealized Gains | Gross Unrealized (Losses) | Fair Value
Debt Securities AFS |  |  |  |
March 31, 2026 |  |  |  |
Corporate securities | $ | 25,000 |  | $ | — |  | $ | (3,500) |  | $ | 21,500 |
SBA securities | 11,425 |  | — |  | (1,092) |  | 10,333 |
Obligations of states and political subdivisions | 162 |  | 3 |  | — |  | 165 |
Non-bank qualified obligations of states and political subdivisions | 202,501 |  | 14 |  | (26,718) |  | 175,797 |
Asset-backed securities | 129,875 |  | 10 |  | (1,886) |  | 127,999 |
Mortgage-backed securities | 1,086,392 |  | 82 |  | (150,915) |  | 935,559 |
Total debt securities AFS | $ | 1,455,355 |  | $ | 109 |  | $ | (184,111) |  | $ | 1,271,353 |
September 30, 2025 |  |  |  |
Corporate securities | $ | 25,000 |  | $ | — |  | $ | (3,750) |  | $ | 21,250 |
SBA securities | 11,791 |  | — |  | (1,022) |  | 10,769 |
Obligations of states and political subdivisions | 162 |  | — |  | — |  | 162 |
Non-bank qualified obligations of states and political subdivisions | 213,072 |  | 25 |  | (26,057) |  | 187,040 |
Asset-backed securities | 138,698 |  | 21 |  | (2,347) |  | 136,372 |
Mortgage-backed securities | 1,129,406 |  | 57 |  | (157,213) |  | 972,250 |
Total debt securities AFS | $ | 1,518,129 |  | $ | 103 |  | $ | (190,389) |  | $ | 1,327,843 |
Debt Securities HTM |  |  |  |
March 31, 2026 |  |  |  |
Non-bank qualified obligations of states and political subdivisions | $ | 26,264 |  | $ | — |  | $ | (3,906) |  | $ | 22,358 |
Mortgage-backed securities | 1,804 |  | — |  | (201) |  | 1,603 |
Total debt securities HTM | $ | 28,068 |  | $ | — |  | $ | (4,107) |  | $ | 23,961 |
September 30, 2025 |
Non-bank qualified obligations of states and political subdivisions | $ | 27,373 |  | $ | — |  | $ | (3,430) |  | $ | 23,943 |
Mortgage-backed securities | 1,935 |  | — |  | (225) |  | 1,710 |
Total debt securities HTM | $ | 29,308 |  | $ | — |  | $ | (3,655) |  | $ | 25,653 |
Schedule of Unrealized Loss on Investments, AFS | Gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous loss position, were as follows:
| LESS THAN 12 MONTHS |  | OVER 12 MONTHS |  | TOTAL
(Dollars in thousands) | Fair Value | Gross Unrealized (Losses) |  | Fair Value | Gross Unrealized (Losses) |  | Fair Value | Gross Unrealized (Losses)
Debt Securities AFS |  |  |  |  |  |  |  |
March 31, 2026 |  |  |  |  |  |  |  |
Corporate securities | $ | — |  | $ | — |  |  | $ | 21,500 |  | $ | (3,500) |  |  | $ | 21,500 |  | $ | (3,500) |
SBA securities | — |  | — |  |  | 10,332 |  | (1,092) |  |  | 10,332 |  | (1,092) |
Non-bank qualified obligations of states and political subdivisions | — |  | — |  |  | 174,258 |  | (26,718) |  |  | 174,258 |  | (26,718) |
Asset-backed securities | 60,121 |  | (1,234) |  |  | 63,297 |  | (652) |  |  | 123,418 |  | (1,886) |
Mortgage-backed securities | 1,501 |  | — |  |  | 923,813 |  | (150,915) |  |  | 925,314 |  | (150,915) |
Total debt securities AFS | $ | 61,622 |  | $ | (1,234) |  |  | $ | 1,193,200 |  | $ | (182,877) |  |  | $ | 1,254,822 |  | $ | (184,111) |
September 30, 2025 |  |  |  |  |  |  |  |
Corporate securities | $ | — |  | $ | — |  |  | $ | 21,250 |  | $ | (3,750) |  |  | $ | 21,250 |  | $ | (3,750) |
SBA securities | — |  | — |  |  | 10,769 |  | (1,022) |  |  | 10,769 |  | (1,022) |
Non-bank qualified obligations of states and political subdivisions | — |  | — |  |  | 185,089 |  | (26,057) |  |  | 185,089 |  | (26,057) |
Asset-backed securities | 64,995 |  | (556) |  |  | 66,263 |  | (1,791) |  |  | 131,258 |  | (2,347) |
Mortgage-backed securities | 1,102 |  | (2) |  |  | 965,549 |  | (157,211) |  |  | 966,651 |  | (157,213) |
Total debt securities AFS | $ | 66,097 |  | $ | (558) |  |  | $ | 1,248,920 |  | $ | (189,831) |  |  | $ | 1,315,017 |  | $ | (190,389) |
Debt Securities HTM |  |  |  |  |  |  |  |
March 31, 2026 |  |  |  |  |  |  |  |
Non-bank qualified obligations of states and political subdivisions | $ | — |  | $ | — |  |  | $ | 22,358 |  | $ | (3,906) |  |  | $ | 22,358 |  | $ | (3,906) |
Mortgage-backed securities | — |  | — |  |  | 1,603 |  | (201) |  |  | 1,603 |  | (201) |
Total debt securities HTM | $ | — |  | $ | — |  |  | $ | 23,961 |  | $ | (4,107) |  |  | $ | 23,961 |  | $ | (4,107) |
September 30, 2025 |  |  |  |  |  |  |  |
Non-bank qualified obligations of states and political subdivisions | $ | — |  | $ | — |  |  | $ | 23,943 |  | $ | (3,430) |  |  | $ | 23,943 |  | $ | (3,430) |
Mortgage-backed securities | — |  | — |  |  | 1,710 |  | (225) |  |  | 1,710 |  | (225) |
Total debt securities HTM | $ | — |  | $ | — |  |  | $ | 25,653 |  | $ | (3,655) |  |  | $ | 25,653 |  | $ | (3,655) |
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity | The amortized cost and fair value of debt securities by contractual maturity are shown below. Certain securities have call features which allow the issuer to call the security prior to maturity. Expected maturities may differ from contractual maturities in MBS because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Therefore, MBS are not included in the maturity categories in the following maturity summary. The expected maturities of certain SBA securities may differ from contractual maturities because the borrowers may have the right to prepay the obligation. However, certain prepayment penalties may apply.
(Dollars in thousands) | March 31, 2026 |  | September 30, 2025
Debt Securities AFS | Amortized Cost | Fair Value |  | Amortized Cost | Fair Value
Due in one year or less | $ | 1,295 |  | $ | 1,305 |  |  | $ | 755 |  | $ | 760 |
Due after one year through five years | 392 |  | 399 |  |  | 1,332 |  | 1,352 |
Due after five years through ten years | 27,332 |  | 23,834 |  |  | 27,688 |  | 23,947 |
Due after ten years | 339,944 |  | 310,256 |  |  | 358,948 |  | 329,534 |
| 368,963 |  | 335,794 |  |  | 388,723 |  | 355,593 |
Mortgage-backed securities | 1,086,392 |  | 935,559 |  |  | 1,129,406 |  | 972,250 |
Total debt securities AFS | $ | 1,455,355 |  | $ | 1,271,353 |  |  | $ | 1,518,129 |  | $ | 1,327,843 |
Debt Securities HTM |  |  |  |  |
Due after ten years | $ | 26,264 |  | $ | 22,358 |  |  | $ | 27,373 |  | $ | 23,943 |
| 26,264 |  | 22,358 |  |  | 27,373 |  | 23,943 |
Mortgage-backed securities | 1,804 |  | 1,603 |  |  | 1,935 |  | 1,710 |
Total debt securities HTM | $ | 28,068 |  | $ | 23,961 |  |  | $ | 29,308 |  | $ | 25,653 |

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