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SECURITIES - Schedule of Securities Available (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Available For Sale |  |
Amortized Cost | $ 2,165,719 | $ 1,855,084
Fair Value | 1,882,869 | 1,864,899
Amortized Cost |  |
Due in one year or less | 718 | 810
Due after one year through five years | 9,921 | 13,026
Due after five years through ten years | 89,921 | 50,785
Due after ten years | 483,707 | 773,985
Total Amortized Cost | 584,267 | 838,606
Mortgage-backed securities | 1,581,452 | 1,016,478
Total securities AFS, at fair value | 2,165,719 | 1,855,084
Fair Value |  |
Due in one year or less | 715 | 822
Due after one year through five years | 9,395 | 13,378
Due after five years through ten years | 81,819 | 52,357
Due after ten years | 441,943 | 781,313
Total Fair Value | 533,872 | 847,870
Mortgage-backed securities | 1,348,997 | 1,017,029
Total securities AFS, at fair value | 1,882,869 | 1,864,899
Held To Maturity |  |
Amortized Cost | 41,682 | 56,669
Gross Unrealized Gains | 0 | 193
Gross Unrealized (Losses) | (3,511) | (471)
Fair Value | 38,171 | 56,391
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 6,252 | 26,096
OVER 12 MONTHS, Fair Value | 31,919 | 0
TOTAL, Fair Value | 38,171 | 26,096
LESS THAN 12 MONTHS, Unrealized (Losses) | (621) | (471)
OVER 12 MONTHS, Unrealized (Losses) | (2,890) | 0
TOTAL, Unrealized (Losses) | (3,511) | (471)
AMORTIZED COST [Abstract] |  |
Due after ten years | 39,093 | 52,944
Total Amortized Cost | 39,093 | 52,944
Mortgage-backed securities | 2,589 | 3,725
Total securities HTM, at cost | 41,682 | 56,669
FAIR VALUE [Abstract] |  |
Due after ten years | 35,903 | 52,576
Total Fair Value | 35,903 | 52,576
Mortgage-backed securities | 2,268 | 3,815
Total securities HTM, at cost | 38,171 | 56,391
Corporate securities |  |
Available For Sale |  |
Amortized Cost | 25,000 | 25,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (2,813) | 0
Fair Value | 22,187 | 25,000
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 0 |
Unrealized (Losses), Less than 12 months | 0 |
Fair Value, 12 Months or Longer | 22,187 |
Unrealized (Losses), 12 Months or Longer | (2,813) |
Fair Value, Total | 22,187 |
Unrealized (Losses), Total | (2,813) |
Amortized Cost |  |
Total securities AFS, at fair value | 25,000 | 25,000
Fair Value |  |
Total securities AFS, at fair value | 22,187 | 25,000
SBA securities |  |
Available For Sale |  |
Amortized Cost | 105,238 | 151,958
Gross Unrealized Gains | 0 | 5,251
Gross Unrealized (Losses) | (7,470) | 0
Fair Value | 97,768 | 157,209
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 97,767 |
Unrealized (Losses), Less than 12 months | (7,470) |
Fair Value, 12 Months or Longer | 0 |
Unrealized (Losses), 12 Months or Longer | 0 |
Fair Value, Total | 97,767 |
Unrealized (Losses), Total | (7,470) |
Amortized Cost |  |
Total securities AFS, at fair value | 105,238 | 151,958
Fair Value |  |
Total securities AFS, at fair value | 97,768 | 157,209
Obligations of states and political subdivisions |  |
Available For Sale |  |
Amortized Cost | 2,469 | 2,497
Gross Unrealized Gains | 0 | 10
Gross Unrealized (Losses) | (125) | 0
Fair Value | 2,344 | 2,507
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 2,345 |
Unrealized (Losses), Less than 12 months | (125) |
Fair Value, 12 Months or Longer | 0 |
Unrealized (Losses), 12 Months or Longer | 0 |
Fair Value, Total | 2,345 |
Unrealized (Losses), Total | (125) |
Amortized Cost |  |
Total securities AFS, at fair value | 2,469 | 2,497
Fair Value |  |
Total securities AFS, at fair value | 2,344 | 2,507
Non-bank qualified obligations of states and political subdivisions |  |
Available For Sale |  |
Amortized Cost | 290,754 | 266,048
Gross Unrealized Gains | 0 | 3,347
Gross Unrealized (Losses) | (26,971) | (1,100)
Fair Value | 263,783 | 268,295
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 195,816 | 101,046
Unrealized (Losses), Less than 12 months | (19,743) | (1,100)
Fair Value, 12 Months or Longer | 67,967 | 0
Unrealized (Losses), 12 Months or Longer | (7,228) | 0
Fair Value, Total | 263,783 | 101,046
Unrealized (Losses), Total | (26,971) | (1,100)
Amortized Cost |  |
Total securities AFS, at fair value | 290,754 | 266,048
Fair Value |  |
Total securities AFS, at fair value | 263,783 | 268,295
Held To Maturity |  |
Amortized Cost | 39,093 | 52,944
Gross Unrealized Gains | 0 | 103
Gross Unrealized (Losses) | (3,190) | (471)
Fair Value | 35,903 | 52,576
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 3,984 | 26,096
OVER 12 MONTHS, Fair Value | 31,919 | 0
TOTAL, Fair Value | 35,903 | 26,096
LESS THAN 12 MONTHS, Unrealized (Losses) | (300) | (471)
OVER 12 MONTHS, Unrealized (Losses) | (2,890) | 0
TOTAL, Unrealized (Losses) | (3,190) | (471)
AMORTIZED COST [Abstract] |  |
Total securities HTM, at cost | 39,093 | 52,944
FAIR VALUE [Abstract] |  |
Total securities HTM, at cost | 35,903 | 52,576
Asset-backed securities |  |
Available For Sale |  |
Amortized Cost | 160,806 | 393,103
Gross Unrealized Gains | 0 | 3,003
Gross Unrealized (Losses) | (13,016) | (1,247)
Fair Value | 147,790 | 394,859
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 64,886 | 127,110
Unrealized (Losses), Less than 12 months | (1,838) | (283)
Fair Value, 12 Months or Longer | 82,904 | 91,553
Unrealized (Losses), 12 Months or Longer | (11,178) | (964)
Fair Value, Total | 147,790 | 218,663
Unrealized (Losses), Total | (13,016) | (1,247)
Amortized Cost |  |
Total securities AFS, at fair value | 160,806 | 393,103
Fair Value |  |
Total securities AFS, at fair value | 147,790 | 394,859
Mortgage-backed securities |  |
Available For Sale |  |
Amortized Cost | 1,581,452 | 1,016,478
Gross Unrealized Gains | 0 | 9,728
Gross Unrealized (Losses) | (232,455) | (9,177)
Fair Value | 1,348,997 | 1,017,029
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 816,657 | 759,035
Unrealized (Losses), Less than 12 months | (106,583) | (7,418)
Fair Value, 12 Months or Longer | 532,340 | 60,792
Unrealized (Losses), 12 Months or Longer | (125,872) | (1,759)
Fair Value, Total | 1,348,997 | 819,827
Unrealized (Losses), Total | (232,455) | (9,177)
Amortized Cost |  |
Total securities AFS, at fair value | 1,581,452 | 1,016,478
Fair Value |  |
Total securities AFS, at fair value | 1,348,997 | 1,017,029
Held To Maturity |  |
Amortized Cost | 2,589 | 3,725
Gross Unrealized Gains | 0 | 90
Gross Unrealized (Losses) | (321) | 0
Fair Value | 2,268 | 3,815
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 2,268 |
OVER 12 MONTHS, Fair Value | 0 |
TOTAL, Fair Value | 2,268 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (321) |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Unrealized (Losses) | (321) |
AMORTIZED COST [Abstract] |  |
Total securities HTM, at cost | 2,589 | 3,725
FAIR VALUE [Abstract] |  |
Total securities HTM, at cost | 2,268 | 3,815
Total debt securities AFS |  |
Available For Sale |  |
Amortized Cost | 2,165,719 | 1,855,084
Gross Unrealized Gains | 0 | 21,339
Gross Unrealized (Losses) | (282,850) | (11,524)
Fair Value | 1,882,869 | 1,864,899
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 1,177,471 | 987,191
Unrealized (Losses), Less than 12 months | (135,759) | (8,801)
Fair Value, 12 Months or Longer | 705,398 | 152,345
Unrealized (Losses), 12 Months or Longer | (147,091) | (2,723)
Fair Value, Total | 1,882,869 | 1,139,536
Unrealized (Losses), Total | (282,850) | (11,524)
Amortized Cost |  |
Total securities AFS, at fair value | 2,165,719 | 1,855,084
Fair Value |  |
Total securities AFS, at fair value | $ 1,882,869 | $ 1,864,899

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