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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Available-for-sale debt securities [Abstract]    
Amortized Cost $ 2,000,906 $ 2,143,333
Fair Value 1,725,460 1,804,228
Amortized Cost    
Due in one year or less 513 5,023
Due after one year through five years 20,007 11,175
Due after five years through ten years 72,379 79,139
Due after ten years 487,567 552,360
Total 580,466 647,697
Mortgage-backed securities 1,420,440 1,495,636
Fair Value    
Due in one year or less 506 4,971
Due after one year through five years 18,631 10,292
Due after five years through ten years 63,601 66,428
Due after ten years 444,251 497,012
Total 526,989 578,703
Mortgage-backed securities 1,198,471 1,225,525
Corporate securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 25,000 25,000
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (5,375) (6,750)
Fair Value 19,625 18,250
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 19,625 18,250
OVER 12 MONTHS, Gross Unrealized (Losses) (5,375) (6,750)
TOTAL, Fair Value 19,625 18,250
TOTAL, Gross Unrealized (Losses) (5,375) (6,750)
SBA securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 90,960 95,549
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (7,389) (10,307)
Fair Value 83,571 85,242
LESS THAN 12 MONTHS, Fair Value 0 22,327
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 (1,919)
OVER 12 MONTHS, Fair Value 83,571 62,915
OVER 12 MONTHS, Gross Unrealized (Losses) (7,389) (8,388)
TOTAL, Fair Value 83,571 85,242
TOTAL, Gross Unrealized (Losses) (7,389) (10,307)
Obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 502 2,368
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (36) (79)
Fair Value 466 2,289
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 466 2,289
OVER 12 MONTHS, Gross Unrealized (Losses) (36) (79)
TOTAL, Fair Value 466 2,289
TOTAL, Gross Unrealized (Losses) (36) (79)
Non-bank qualified obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 252,583 269,396
Gross Unrealized Gains 8 0
Gross Unrealized (Losses) (36,424) (42,673)
Fair Value 216,167 226,723
LESS THAN 12 MONTHS, Fair Value 0 5,010
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 (83)
OVER 12 MONTHS, Fair Value 214,139 221,714
OVER 12 MONTHS, Gross Unrealized (Losses) (36,424) (42,590)
TOTAL, Fair Value 214,139 226,723
TOTAL, Gross Unrealized (Losses) (36,424) (42,673)
Asset-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 211,421 255,384
Gross Unrealized Gains 418 234
Gross Unrealized (Losses) (4,679) (9,419)
Fair Value 207,160 246,199
LESS THAN 12 MONTHS, Fair Value 0 46,528
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 (224)
OVER 12 MONTHS, Fair Value 94,518 115,608
OVER 12 MONTHS, Gross Unrealized (Losses) (4,679) (9,195)
TOTAL, Fair Value 94,518 162,136
TOTAL, Gross Unrealized (Losses) (4,679) (9,419)
Mortgage-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,420,440 1,495,636
Gross Unrealized Gains 3 0
Gross Unrealized (Losses) (221,972) (270,111)
Fair Value 1,198,471 1,225,525
LESS THAN 12 MONTHS, Fair Value 2,635 18,311
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (42) (944)
OVER 12 MONTHS, Fair Value 1,194,791 1,207,214
OVER 12 MONTHS, Gross Unrealized (Losses) (221,930) (269,167)
TOTAL, Fair Value 1,197,426 1,225,525
TOTAL, Gross Unrealized (Losses) (221,972) (270,111)
Total debt securities AFS    
Available-for-sale debt securities [Abstract]    
Amortized Cost 2,000,906 2,143,333
Gross Unrealized Gains 429 234
Gross Unrealized (Losses) (275,875) (339,339)
Fair Value 1,725,460 1,804,228
LESS THAN 12 MONTHS, Fair Value 2,635 92,176
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (42) (3,170)
OVER 12 MONTHS, Fair Value 1,607,110 1,627,990
OVER 12 MONTHS, Gross Unrealized (Losses) (275,833) (336,169)
TOTAL, Fair Value 1,609,745 1,720,165
TOTAL, Gross Unrealized (Losses) $ (275,875) $ (339,339)