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SECURITIES - Schedule of Securities Available (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Securities AFS    
Amortized Cost $ 1,518,129 $ 1,944,298
Fair Value 1,327,843 1,741,221
Amortized Cost    
Due in one year or less 755 1,826
Due after one year through five years 1,332 14,772
Due after five years through ten years 27,688 70,894
Due after ten years 358,948 463,257
Total Amortized Cost 388,723 550,749
Mortgage-backed securities 1,129,406 1,393,549
Amortized Cost 1,518,129 1,944,298
Fair Value    
Due in one year or less 760 1,796
Due after one year through five years 1,352 14,211
Due after five years through ten years 23,947 63,636
Due after ten years 329,534 430,210
Total Fair Value 355,593 509,853
Mortgage-backed securities 972,250 1,231,368
Total debt securities AFS 1,327,843 1,741,221
Securities HTM    
Amortized Cost 29,308 33,092
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (3,655) (2,856)
Fair Value 25,653 30,236
Held-to-maturity securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 25,653 30,236
OVER 12 MONTHS, Gross Unrealized (Losses) (3,655) (2,856)
TOTAL, Fair Value 25,653 30,236
TOTAL, Gross Unrealized (Losses) (3,655) (2,856)
Amortized Cost    
Due after ten years 27,373 31,060
Total 27,373 31,060
Mortgage-backed securities 1,935 2,032
Total debt securities HTM 29,308 33,092
Fair Value    
Due after ten years 23,943 28,392
Total 23,943 28,392
Mortgage-backed securities 1,710 1,844
Fair Value 25,653 30,236
Corporate securities    
Securities AFS    
Amortized Cost 25,000 25,000
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (3,750) (5,250)
Fair Value 21,250 19,750
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 0 0
Unrealized (Losses), Less than 12 months 0 0
Fair Value, 12 Months or Longer 21,250 19,750
Unrealized (Losses), 12 Months or Longer (3,750) (5,250)
Fair Value, Total 21,250 19,750
Unrealized (Losses), Total (3,750) (5,250)
Amortized Cost    
Amortized Cost 25,000 25,000
Fair Value    
Total debt securities AFS 21,250 19,750
SBA securities    
Securities AFS    
Amortized Cost 11,791 86,036
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (1,022) (4,101)
Fair Value 10,769 81,935
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 0 0
Unrealized (Losses), Less than 12 months 0 0
Fair Value, 12 Months or Longer 10,769 81,935
Unrealized (Losses), 12 Months or Longer (1,022) (4,101)
Fair Value, Total 10,769 81,935
Unrealized (Losses), Total (1,022) (4,101)
Amortized Cost    
Amortized Cost 11,791 86,036
Fair Value    
Total debt securities AFS 10,769 81,935
Obligations of states and political subdivisions    
Securities AFS    
Amortized Cost 162 501
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 (21)
Fair Value 162 480
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months   0
Unrealized (Losses), Less than 12 months   0
Fair Value, 12 Months or Longer   280
Unrealized (Losses), 12 Months or Longer   (21)
Fair Value, Total   280
Unrealized (Losses), Total   (21)
Amortized Cost    
Amortized Cost 162 501
Fair Value    
Total debt securities AFS 162 480
Non-bank qualified obligations of states and political subdivisions    
Securities AFS    
Amortized Cost 213,072 246,233
Gross Unrealized Gains 25 44
Gross Unrealized (Losses) (26,057) (28,287)
Fair Value 187,040 217,990
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 0 0
Unrealized (Losses), Less than 12 months 0 0
Fair Value, 12 Months or Longer 185,089 215,956
Unrealized (Losses), 12 Months or Longer (26,057) (28,287)
Fair Value, Total 185,089 215,956
Unrealized (Losses), Total (26,057) (28,287)
Amortized Cost    
Amortized Cost 213,072 246,233
Fair Value    
Total debt securities AFS 187,040 217,990
Securities HTM    
Amortized Cost 27,373 31,060
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (3,430) (2,668)
Fair Value 23,943 28,392
Held-to-maturity securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 23,943 28,392
OVER 12 MONTHS, Gross Unrealized (Losses) (3,430) (2,668)
TOTAL, Fair Value 23,943 28,392
TOTAL, Gross Unrealized (Losses) (3,430) (2,668)
Amortized Cost    
Total debt securities HTM 27,373 31,060
Fair Value    
Fair Value 23,943 28,392
Asset-backed securities    
Securities AFS    
Amortized Cost 138,698 192,979
Gross Unrealized Gains 21 337
Gross Unrealized (Losses) (2,347) (3,618)
Fair Value 136,372 189,698
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 64,995 52,101
Unrealized (Losses), Less than 12 months (556) (176)
Fair Value, 12 Months or Longer 66,263 88,576
Unrealized (Losses), 12 Months or Longer (1,791) (3,442)
Fair Value, Total 131,258 140,677
Unrealized (Losses), Total (2,347) (3,618)
Amortized Cost    
Amortized Cost 138,698 192,979
Fair Value    
Total debt securities AFS 136,372 189,698
Mortgage-backed securities    
Securities AFS    
Amortized Cost 1,129,406 1,393,549
Gross Unrealized Gains 57 84
Gross Unrealized (Losses) (157,213) (162,265)
Fair Value 972,250 1,231,368
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 1,102 2,377
Unrealized (Losses), Less than 12 months (2) (15)
Fair Value, 12 Months or Longer 965,549 1,215,781
Unrealized (Losses), 12 Months or Longer (157,211) (162,250)
Fair Value, Total 966,651 1,218,158
Unrealized (Losses), Total (157,213) (162,265)
Amortized Cost    
Amortized Cost 1,129,406 1,393,549
Fair Value    
Total debt securities AFS 972,250 1,231,368
Securities HTM    
Amortized Cost 1,935 2,032
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (225) (188)
Fair Value 1,710 1,844
Held-to-maturity securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 1,710 1,844
OVER 12 MONTHS, Gross Unrealized (Losses) (225) (188)
TOTAL, Fair Value 1,710 1,844
TOTAL, Gross Unrealized (Losses) (225) (188)
Amortized Cost    
Total debt securities HTM 1,935 2,032
Fair Value    
Fair Value 1,710 1,844
Total debt securities AFS    
Securities AFS    
Amortized Cost 1,518,129 1,944,298
Gross Unrealized Gains 103 465
Gross Unrealized (Losses) (190,389) (203,542)
Fair Value 1,327,843 1,741,221
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 66,097 54,478
Unrealized (Losses), Less than 12 months (558) (191)
Fair Value, 12 Months or Longer 1,248,920 1,622,278
Unrealized (Losses), 12 Months or Longer (189,831) (203,351)
Fair Value, Total 1,315,017 1,676,756
Unrealized (Losses), Total (190,389) (203,542)
Amortized Cost    
Amortized Cost 1,518,129 1,944,298
Fair Value    
Total debt securities AFS $ 1,327,843 $ 1,741,221