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SECURITIES (Tables)
6 Months Ended
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 CostGross Unrealized GainsGross Unrealized (Losses)Fair
Value
Debt Securities AFS
March 31, 2026
Corporate securities$25,000 $— $(3,500)$21,500 
SBA securities11,425 — (1,092)10,333 
Obligations of states and political subdivisions162 — 165 
Non-bank qualified obligations of states and political subdivisions202,501 14 (26,718)175,797 
Asset-backed securities129,875 10 (1,886)127,999 
Mortgage-backed securities1,086,392 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 securities11,791 — (1,022)10,769 
Obligations of states and political subdivisions162 — — 162 
Non-bank qualified obligations of states and political subdivisions213,072 25 (26,057)187,040 
Asset-backed securities138,698 21 (2,347)136,372 
Mortgage-backed securities1,129,406 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 securities1,804 — (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 securities1,935 — (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 MONTHSOVER 12 MONTHSTOTAL
(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 securities60,121 (1,234)63,297 (652)123,418 (1,886)
Mortgage-backed securities1,501 — 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 securities64,995 (556)66,263 (1,791)131,258 (2,347)
Mortgage-backed securities1,102 (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, 2026September 30, 2025
Debt Securities AFSAmortized CostFair
Value
Amortized CostFair
Value
Due in one year or less$1,295 $1,305 $755 $760 
Due after one year through five years392 399 1,332 1,352 
Due after five years through ten years27,332 23,834 27,688 23,947 
Due after ten years339,944 310,256 358,948 329,534 
368,963 335,794 388,723 355,593 
Mortgage-backed securities1,086,392 935,559 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 securities1,804 1,603 1,935 1,710 
Total debt securities HTM$28,068 $23,961 $29,308 $25,653