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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Available-for-sale debt securities [Abstract]    
Amortized Cost $ 2,053,441 $ 2,143,333
Fair Value 1,779,458 1,804,228
Amortized Cost    
Due in one year or less 1,188 5,023
Due after one year through five years 19,591 11,175
Due after five years through ten years 73,455 79,139
Due after ten years 510,558 552,360
Total 604,792 647,697
Mortgage-backed securities 1,448,649 1,495,636
Fair Value    
Due in one year or less 1,175 4,971
Due after one year through five years 18,249 10,292
Due after five years through ten years 63,343 66,428
Due after ten years 466,745 497,012
Total 549,512 578,703
Mortgage-backed securities 1,229,946 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) (6,875) (6,750)
Fair Value 18,125 18,250
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 18,125 18,250
OVER 12 MONTHS, Gross Unrealized (Losses) (6,875) (6,750)
TOTAL, Fair Value 18,125 18,250
TOTAL, Gross Unrealized (Losses) (6,875) (6,750)
SBA securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 91,979 95,549
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (7,182) (10,307)
Fair Value 84,797 85,242
LESS THAN 12 MONTHS, Fair Value 22,894 22,327
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (978) (1,919)
OVER 12 MONTHS, Fair Value 61,903 62,915
OVER 12 MONTHS, Gross Unrealized (Losses) (6,204) (8,388)
TOTAL, Fair Value 84,797 85,242
TOTAL, Gross Unrealized (Losses) (7,182) (10,307)
Obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 540 2,368
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (33) (79)
Fair Value 507 2,289
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 506 2,289
OVER 12 MONTHS, Gross Unrealized (Losses) (33) (79)
TOTAL, Fair Value 506 2,289
TOTAL, Gross Unrealized (Losses) (33) (79)
Non-bank qualified obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 258,421 269,396
Gross Unrealized Gains 14 0
Gross Unrealized (Losses) (35,766) (42,673)
Fair Value 222,669 226,723
LESS THAN 12 MONTHS, Fair Value 940 5,010
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (20) (83)
OVER 12 MONTHS, Fair Value 219,665 221,714
OVER 12 MONTHS, Gross Unrealized (Losses) (35,746) (42,590)
TOTAL, Fair Value 220,605 226,723
TOTAL, Gross Unrealized (Losses) (35,766) (42,673)
Asset-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 228,852 255,384
Gross Unrealized Gains 420 234
Gross Unrealized (Losses) (5,858) (9,419)
Fair Value 223,414 246,199
LESS THAN 12 MONTHS, Fair Value 0 46,528
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 (224)
OVER 12 MONTHS, Fair Value 103,409 115,608
OVER 12 MONTHS, Gross Unrealized (Losses) (5,858) (9,195)
TOTAL, Fair Value 103,409 162,136
TOTAL, Gross Unrealized (Losses) (5,858) (9,419)
Mortgage-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,448,649 1,495,636
Gross Unrealized Gains 12 0
Gross Unrealized (Losses) (218,715) (270,111)
Fair Value 1,229,946 1,225,525
LESS THAN 12 MONTHS, Fair Value 17,317 18,311
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (371) (944)
OVER 12 MONTHS, Fair Value 1,211,570 1,207,214
OVER 12 MONTHS, Gross Unrealized (Losses) (218,344) (269,167)
TOTAL, Fair Value 1,228,887 1,225,525
TOTAL, Gross Unrealized (Losses) (218,715) (270,111)
Total debt securities AFS    
Available-for-sale debt securities [Abstract]    
Amortized Cost 2,053,441 2,143,333
Gross Unrealized Gains 446 234
Gross Unrealized (Losses) (274,429) (339,339)
Fair Value 1,779,458 1,804,228
LESS THAN 12 MONTHS, Fair Value 41,151 92,176
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (1,369) (3,170)
OVER 12 MONTHS, Fair Value 1,615,178 1,627,990
OVER 12 MONTHS, Gross Unrealized (Losses) (273,060) (336,169)
TOTAL, Fair Value 1,656,329 1,720,165
TOTAL, Gross Unrealized (Losses) $ (274,429) $ (339,339)