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SECURITIES - Schedule of Securities Available (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Securities AFS |  |
Amortized Cost | $ 2,143,333 | $ 2,165,719
Fair Value | 1,804,228 | 1,882,869
Amortized Cost |  |
Due in one year or less | 5,023 | 718
Due after one year through five years | 11,175 | 9,921
Due after five years through ten years | 79,139 | 89,921
Due after ten years | 552,360 | 483,707
Total Amortized Cost | 647,697 | 584,267
Mortgage-backed securities | 1,495,636 | 1,581,452
Total securities AFS, at fair value | 2,143,333 | 2,165,719
Fair Value |  |
Due in one year or less | 4,971 | 715
Due after one year through five years | 10,292 | 9,395
Due after five years through ten years | 66,428 | 81,819
Due after ten years | 497,012 | 441,943
Total Fair Value | 578,703 | 533,872
Mortgage-backed securities | 1,225,525 | 1,348,997
Total securities AFS, at fair value | 1,804,228 | 1,882,869
Securities HTM |  |
Amortized Cost | 36,591 | 41,682
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (5,166) | (3,511)
Fair Value | 31,425 | 38,171
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 0 | 6,252
OVER 12 MONTHS, Fair Value | 31,425 | 31,919
TOTAL, Fair Value | 31,425 | 38,171
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 | (621)
OVER 12 MONTHS, Unrealized (Losses) | (5,166) | (2,890)
TOTAL, Unrealized (Losses) | (5,166) | (3,511)
AMORTIZED COST [Abstract] |  |
Due after ten years | 34,415 | 39,093
Total Amortized Cost | 34,415 | 39,093
Mortgage-backed securities | 2,176 | 2,589
Total securities HTM, at cost | 36,591 | 41,682
FAIR VALUE [Abstract] |  |
Due after ten years | 29,571 | 35,903
Total Fair Value | 29,571 | 35,903
Mortgage-backed securities | 1,854 | 2,268
Total securities HTM, at cost | 31,425 | 38,171
Corporate securities |  |
Securities AFS |  |
Amortized Cost | 25,000 | 25,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (6,750) | (2,813)
Fair Value | 18,250 | 22,187
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 0 | 0
Unrealized (Losses), Less than 12 months | 0 | 0
Fair Value, 12 Months or Longer | 18,250 | 22,187
Unrealized (Losses), 12 Months or Longer | (6,750) | (2,813)
Fair Value, Total | 18,250 | 22,187
Unrealized (Losses), Total | (6,750) | (2,813)
Amortized Cost |  |
Total securities AFS, at fair value | 25,000 | 25,000
Fair Value |  |
Total securities AFS, at fair value | 18,250 | 22,187
SBA securities |  |
Securities AFS |  |
Amortized Cost | 95,549 | 105,238
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (10,307) | (7,470)
Fair Value | 85,242 | 97,768
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 22,327 | 97,767
Unrealized (Losses), Less than 12 months | (1,919) | (7,470)
Fair Value, 12 Months or Longer | 62,915 | 0
Unrealized (Losses), 12 Months or Longer | (8,388) | 0
Fair Value, Total | 85,242 | 97,767
Unrealized (Losses), Total | (10,307) | (7,470)
Amortized Cost |  |
Total securities AFS, at fair value | 95,549 | 105,238
Fair Value |  |
Total securities AFS, at fair value | 85,242 | 97,768
Obligations of states and political subdivisions |  |
Securities AFS |  |
Amortized Cost | 2,368 | 2,469
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (79) | (125)
Fair Value | 2,289 | 2,344
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 0 | 2,345
Unrealized (Losses), Less than 12 months | 0 | (125)
Fair Value, 12 Months or Longer | 2,289 | 0
Unrealized (Losses), 12 Months or Longer | (79) | 0
Fair Value, Total | 2,289 | 2,345
Unrealized (Losses), Total | (79) | (125)
Amortized Cost |  |
Total securities AFS, at fair value | 2,368 | 2,469
Fair Value |  |
Total securities AFS, at fair value | 2,289 | 2,344
Non-bank qualified obligations of states and political subdivisions |  |
Securities AFS |  |
Amortized Cost | 269,396 | 290,754
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (42,673) | (26,971)
Fair Value | 226,723 | 263,783
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 5,010 | 195,816
Unrealized (Losses), Less than 12 months | (83) | (19,743)
Fair Value, 12 Months or Longer | 221,714 | 67,967
Unrealized (Losses), 12 Months or Longer | (42,590) | (7,228)
Fair Value, Total | 226,723 | 263,783
Unrealized (Losses), Total | (42,673) | (26,971)
Amortized Cost |  |
Total securities AFS, at fair value | 269,396 | 290,754
Fair Value |  |
Total securities AFS, at fair value | 226,723 | 263,783
Securities HTM |  |
Amortized Cost | 34,415 | 39,093
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (4,844) | (3,190)
Fair Value | 29,571 | 35,903
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 0 | 3,984
OVER 12 MONTHS, Fair Value | 29,571 | 31,919
TOTAL, Fair Value | 29,571 | 35,903
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 | (300)
OVER 12 MONTHS, Unrealized (Losses) | (4,844) | (2,890)
TOTAL, Unrealized (Losses) | (4,844) | (3,190)
AMORTIZED COST [Abstract] |  |
Total securities HTM, at cost | 34,415 | 39,093
FAIR VALUE [Abstract] |  |
Total securities HTM, at cost | 29,571 | 35,903
Asset-backed securities |  |
Securities AFS |  |
Amortized Cost | 255,384 | 160,806
Gross Unrealized Gains | 234 | 0
Gross Unrealized (Losses) | (9,419) | (13,016)
Fair Value | 246,199 | 147,790
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 46,528 | 64,886
Unrealized (Losses), Less than 12 months | (224) | (1,838)
Fair Value, 12 Months or Longer | 115,608 | 82,904
Unrealized (Losses), 12 Months or Longer | (9,195) | (11,178)
Fair Value, Total | 162,136 | 147,790
Unrealized (Losses), Total | (9,419) | (13,016)
Amortized Cost |  |
Total securities AFS, at fair value | 255,384 | 160,806
Fair Value |  |
Total securities AFS, at fair value | 246,199 | 147,790
Mortgage-backed securities |  |
Securities AFS |  |
Amortized Cost | 1,495,636 | 1,581,452
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (270,111) | (232,455)
Fair Value | 1,225,525 | 1,348,997
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 18,311 | 816,657
Unrealized (Losses), Less than 12 months | (944) | (106,583)
Fair Value, 12 Months or Longer | 1,207,214 | 532,340
Unrealized (Losses), 12 Months or Longer | (269,167) | (125,872)
Fair Value, Total | 1,225,525 | 1,348,997
Unrealized (Losses), Total | (270,111) | (232,455)
Amortized Cost |  |
Total securities AFS, at fair value | 1,495,636 | 1,581,452
Fair Value |  |
Total securities AFS, at fair value | 1,225,525 | 1,348,997
Securities HTM |  |
Amortized Cost | 2,176 | 2,589
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (322) | (321)
Fair Value | 1,854 | 2,268
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 0 | 2,268
OVER 12 MONTHS, Fair Value | 1,854 | 0
TOTAL, Fair Value | 1,854 | 2,268
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 | (321)
OVER 12 MONTHS, Unrealized (Losses) | (322) | 0
TOTAL, Unrealized (Losses) | (322) | (321)
AMORTIZED COST [Abstract] |  |
Total securities HTM, at cost | 2,176 | 2,589
FAIR VALUE [Abstract] |  |
Total securities HTM, at cost | 1,854 | 2,268
Total debt securities AFS |  |
Securities AFS |  |
Amortized Cost | 2,143,333 | 2,165,719
Gross Unrealized Gains | 234 | 0
Gross Unrealized (Losses) | (339,339) | (282,850)
Fair Value | 1,804,228 | 1,882,869
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 92,176 | 1,177,471
Unrealized (Losses), Less than 12 months | (3,170) | (135,759)
Fair Value, 12 Months or Longer | 1,627,990 | 705,398
Unrealized (Losses), 12 Months or Longer | (336,169) | (147,091)
Fair Value, Total | 1,720,165 | 1,882,869
Unrealized (Losses), Total | (339,339) | (282,850)
Amortized Cost |  |
Total securities AFS, at fair value | 2,143,333 | 2,165,719
Fair Value |  |
Total securities AFS, at fair value | $ 1,804,228 | $ 1,882,869

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