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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Available-for-sale debt securities [Abstract]    
Amortized Cost $ 1,628,521 $ 1,944,298
Fair Value 1,411,520 1,741,221
Amortized Cost    
Due in one year or less 380 1,826
Due after one year through five years 1,750 14,772
Due after five years through ten years 40,206 70,894
Due after ten years 378,704 463,257
Total 421,040 550,749
Mortgage-backed securities 1,207,481 1,393,549
Fair Value    
Due in one year or less 382 1,796
Due after one year through five years 1,773 14,211
Due after five years through ten years 36,413 63,636
Due after ten years 343,934 430,210
Total 382,502 509,853
Mortgage-backed securities 1,029,018 1,231,368
Corporate securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 25,000 25,000
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (3,875) (5,250)
Fair Value 21,125 19,750
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 21,125 19,750
OVER 12 MONTHS, Gross Unrealized (Losses) (3,875) (5,250)
TOTAL, Fair Value 21,125 19,750
TOTAL, Gross Unrealized (Losses) (3,875) (5,250)
SBA securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 13,122 86,036
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (1,208) (4,101)
Fair Value 11,914 81,935
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 11,914 81,935
OVER 12 MONTHS, Gross Unrealized (Losses) (1,208) (4,101)
TOTAL, Fair Value 11,914 81,935
TOTAL, Gross Unrealized (Losses) (1,208) (4,101)
Obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 200 501
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 (21)
Fair Value 200 480
LESS THAN 12 MONTHS, Fair Value   0
LESS THAN 12 MONTHS, Gross Unrealized (Losses)   0
OVER 12 MONTHS, Fair Value   280
OVER 12 MONTHS, Gross Unrealized (Losses)   (21)
TOTAL, Fair Value   280
TOTAL, Gross Unrealized (Losses)   (21)
Non-bank qualified obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 223,512 246,233
Gross Unrealized Gains 26 44
Gross Unrealized (Losses) (31,536) (28,287)
Fair Value 192,002 217,990
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 190,046 215,956
OVER 12 MONTHS, Gross Unrealized (Losses) (31,536) (28,287)
TOTAL, Fair Value 190,046 215,956
TOTAL, Gross Unrealized (Losses) (31,536) (28,287)
Asset-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 159,206 192,979
Gross Unrealized Gains 358 337
Gross Unrealized (Losses) (2,303) (3,618)
Fair Value 157,261 189,698
LESS THAN 12 MONTHS, Fair Value 36,156 52,101
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (313) (176)
OVER 12 MONTHS, Fair Value 63,930 88,576
OVER 12 MONTHS, Gross Unrealized (Losses) (1,990) (3,442)
TOTAL, Fair Value 100,086 140,677
TOTAL, Gross Unrealized (Losses) (2,303) (3,618)
Mortgage-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,207,481 1,393,549
Gross Unrealized Gains 13 84
Gross Unrealized (Losses) (178,476) (162,265)
Fair Value 1,029,018 1,231,368
LESS THAN 12 MONTHS, Fair Value 14,473 2,377
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (123) (15)
OVER 12 MONTHS, Fair Value 1,013,605 1,215,781
OVER 12 MONTHS, Gross Unrealized (Losses) (178,353) (162,250)
TOTAL, Fair Value 1,028,078 1,218,158
TOTAL, Gross Unrealized (Losses) (178,476) (162,265)
Total debt securities AFS    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,628,521 1,944,298
Gross Unrealized Gains 397 465
Gross Unrealized (Losses) (217,398) (203,542)
Fair Value 1,411,520 1,741,221
LESS THAN 12 MONTHS, Fair Value 50,629 54,478
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (436) (191)
OVER 12 MONTHS, Fair Value 1,300,620 1,622,278
OVER 12 MONTHS, Gross Unrealized (Losses) (216,962) (203,351)
TOTAL, Fair Value 1,351,249 1,676,756
TOTAL, Gross Unrealized (Losses) $ (217,398) $ (203,542)