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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Sep. 30, 2025
Available-for-sale debt securities [Abstract]    
Amortized Cost $ 1,455,355 $ 1,518,129
Fair Value 1,271,353 1,327,843
Amortized Cost    
Due in one year or less 1,295 755
Due after one year through five years 392 1,332
Due after five years through ten years 27,332 27,688
Due after ten years 339,944 358,948
Total 368,963 388,723
Mortgage-backed securities 1,086,392 1,129,406
Fair Value    
Due in one year or less 1,305 760
Due after one year through five years 399 1,352
Due after five years through ten years 23,834 23,947
Due after ten years 310,256 329,534
Total 335,794 355,593
Mortgage-backed securities 935,559 972,250
Corporate securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 25,000 25,000
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (3,500) (3,750)
Fair Value 21,500 21,250
Available-for-sale 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, Gross Unrealized (Losses) 21,500 21,250
OVER 12 MONTHS, Gross Unrealized (Losses) (3,500) (3,750)
TOTAL, Gross Unrealized (Losses) 21,500 21,250
Unrealized (Losses), Total (3,500) (3,750)
SBA securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 11,425 11,791
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (1,092) (1,022)
Fair Value 10,333 10,769
Available-for-sale 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, Gross Unrealized (Losses) 10,332 10,769
OVER 12 MONTHS, Gross Unrealized (Losses) (1,092) (1,022)
TOTAL, Gross Unrealized (Losses) 10,332 10,769
Unrealized (Losses), Total (1,092) (1,022)
Obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 162 162
Gross Unrealized Gains 3 0
Gross Unrealized (Losses) 0 0
Fair Value 165 162
Non-bank qualified obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 202,501 213,072
Gross Unrealized Gains 14 25
Gross Unrealized (Losses) (26,718) (26,057)
Fair Value 175,797 187,040
Available-for-sale 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, Gross Unrealized (Losses) 174,258 185,089
OVER 12 MONTHS, Gross Unrealized (Losses) (26,718) (26,057)
TOTAL, Gross Unrealized (Losses) 174,258 185,089
Unrealized (Losses), Total (26,718) (26,057)
Asset-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 129,875 138,698
Gross Unrealized Gains 10 21
Gross Unrealized (Losses) (1,886) (2,347)
Fair Value 127,999 136,372
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 60,121 64,995
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (1,234) (556)
OVER 12 MONTHS, Gross Unrealized (Losses) 63,297 66,263
OVER 12 MONTHS, Gross Unrealized (Losses) (652) (1,791)
TOTAL, Gross Unrealized (Losses) 123,418 131,258
Unrealized (Losses), Total (1,886) (2,347)
Mortgage-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,086,392 1,129,406
Gross Unrealized Gains 82 57
Gross Unrealized (Losses) (150,915) (157,213)
Fair Value 935,559 972,250
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 1,501 1,102
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 (2)
OVER 12 MONTHS, Gross Unrealized (Losses) 923,813 965,549
OVER 12 MONTHS, Gross Unrealized (Losses) (150,915) (157,211)
TOTAL, Gross Unrealized (Losses) 925,314 966,651
Unrealized (Losses), Total (150,915) (157,213)
Total debt securities AFS    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,455,355 1,518,129
Gross Unrealized Gains 109 103
Gross Unrealized (Losses) (184,111) (190,389)
Fair Value 1,271,353 1,327,843
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 61,622 66,097
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (1,234) (558)
OVER 12 MONTHS, Gross Unrealized (Losses) 1,193,200 1,248,920
OVER 12 MONTHS, Gross Unrealized (Losses) (182,877) (189,831)
TOTAL, Gross Unrealized (Losses) 1,254,822 1,315,017
Unrealized (Losses), Total $ (184,111) $ (190,389)