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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Available-for-sale debt securities [Abstract]    
Amortized Cost $ 1,729,835 $ 1,944,298
Fair Value 1,480,090 1,741,221
Amortized Cost    
Due in one year or less 200 1,826
Due after one year through five years 6,592 14,772
Due after five years through ten years 45,866 70,894
Due after ten years 426,825 463,257
Total 479,483 550,749
Mortgage-backed securities 1,250,352 1,393,549
Fair Value    
Due in one year or less 199 1,796
Due after one year through five years 6,372 14,211
Due after five years through ten years 39,595 63,636
Due after ten years 387,218 430,210
Total 433,384 509,853
Mortgage-backed securities 1,046,706 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) (4,000) (5,250)
Fair Value 21,000 19,750
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 21,000 19,750
OVER 12 MONTHS, Gross Unrealized (Losses) (4,000) (5,250)
TOTAL, Fair Value 21,000 19,750
TOTAL, Gross Unrealized (Losses) (4,000) (5,250)
SBA securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 34,501 86,036
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (3,972) (4,101)
Fair Value 30,529 81,935
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 30,528 81,935
OVER 12 MONTHS, Gross Unrealized (Losses) (3,972) (4,101)
TOTAL, Fair Value 30,528 81,935
TOTAL, Gross Unrealized (Losses) (3,972) (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 235,137 246,233
Gross Unrealized Gains 24 44
Gross Unrealized (Losses) (34,436) (28,287)
Fair Value 200,725 217,990
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 198,747 215,956
OVER 12 MONTHS, Gross Unrealized (Losses) (34,436) (28,287)
TOTAL, Fair Value 198,747 215,956
TOTAL, Gross Unrealized (Losses) (34,436) (28,287)
Asset-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 184,645 192,979
Gross Unrealized Gains 322 337
Gross Unrealized (Losses) (4,037) (3,618)
Fair Value 180,930 189,698
LESS THAN 12 MONTHS, Fair Value 48,261 52,101
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (280) (176)
OVER 12 MONTHS, Fair Value 84,879 88,576
OVER 12 MONTHS, Gross Unrealized (Losses) (3,757) (3,442)
TOTAL, Fair Value 133,140 140,677
TOTAL, Gross Unrealized (Losses) (4,037) (3,618)
Mortgage-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,250,352 1,393,549
Gross Unrealized Gains 0 84
Gross Unrealized (Losses) (203,646) (162,265)
Fair Value 1,046,706 1,231,368
LESS THAN 12 MONTHS, Fair Value 15,390 2,377
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (249) (15)
OVER 12 MONTHS, Fair Value 1,031,316 1,215,781
OVER 12 MONTHS, Gross Unrealized (Losses) (203,397) (162,250)
TOTAL, Fair Value 1,046,706 1,218,158
TOTAL, Gross Unrealized (Losses) (203,646) (162,265)
Total debt securities AFS    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,729,835 1,944,298
Gross Unrealized Gains 346 465
Gross Unrealized (Losses) (250,091) (203,542)
Fair Value 1,480,090 1,741,221
LESS THAN 12 MONTHS, Fair Value 63,651 54,478
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (529) (191)
OVER 12 MONTHS, Fair Value 1,366,470 1,622,278
OVER 12 MONTHS, Gross Unrealized (Losses) (249,562) (203,351)
TOTAL, Fair Value 1,430,121 1,676,756
TOTAL, Gross Unrealized (Losses) $ (250,091) $ (203,542)