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SECURITIES - Schedule of Securities Available (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Available For Sale |  |
Amortized Cost | $ 1,855,084 | $ 1,244,384
Fair Value | 1,864,899 | 1,268,102
Amortized Cost |  |
Due in one year or less | 810 | 1,385
Due after one year through five years | 13,026 | 20,805
Due after five years through ten years | 50,785 | 32,441
Due after ten years | 773,985 | 749,874
Total Amortized Cost | 838,606 | 804,505
Mortgage-backed securities | 1,016,478 | 439,879
Total securities AFS, at fair value | 1,855,084 | 1,244,384
Fair Value |  |
Due in one year or less | 822 | 1,398
Due after one year through five years | 13,378 | 21,769
Due after five years through ten years | 52,357 | 34,025
Due after ten years | 781,313 | 757,303
Total Fair Value | 847,870 | 814,495
Mortgage-backed securities | 1,017,029 | 453,607
Total securities AFS, at fair value | 1,864,899 | 1,268,102
Held To Maturity |  |
Amortized Cost | 56,669 | 92,610
Gross Unrealized Gains | 193 | 1,164
Gross Unrealized (Losses) | (471) | (29)
Fair Value | 56,391 | 93,745
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 26,096 | 7,397
OVER 12 MONTHS, Fair Value | 0 | 3,637
TOTAL, Fair Value | 26,096 | 11,034
LESS THAN 12 MONTHS, Unrealized (Losses) | (471) | (9)
OVER 12 MONTHS, Unrealized (Losses) | 0 | (20)
TOTAL, Unrealized (Losses) | (471) | (29)
AMORTIZED COST [Abstract] |  |
Due after ten years | 52,944 | 87,183
Total Amortized Cost | 52,944 | 87,183
Mortgage-backed securities | 3,725 | 5,427
Total securities HTM, at cost | 56,669 | 92,610
FAIR VALUE [Abstract] |  |
Due after ten years | 52,576 | 88,194
Total Fair Value | 52,576 | 88,194
Mortgage-backed securities | 3,815 | 5,551
Total securities HTM, at cost | 56,391 | 93,745
Corporate securities |  |
Available For Sale |  |
Amortized Cost | 25,000 |
Gross Unrealized Gains | 0 |
Gross Unrealized (Losses) | 0 |
Fair Value | 25,000 |
Amortized Cost |  |
Total securities AFS, at fair value | 25,000 |
Fair Value |  |
Total securities AFS, at fair value | 25,000 |
SBA securities |  |
Available For Sale |  |
Amortized Cost | 151,958 | 159,722
Gross Unrealized Gains | 5,251 | 5,391
Gross Unrealized (Losses) | 0 | (158)
Fair Value | 157,209 | 164,955
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months |  | 32,257
Unrealized (Losses), Less than 12 months |  | (102)
Fair Value, 12 Months or Longer |  | 9,875
Unrealized (Losses), 12 Months or Longer |  | (56)
Fair Value, Total |  | 42,132
Unrealized (Losses), Total |  | (158)
Amortized Cost |  |
Total securities AFS, at fair value | 151,958 | 159,722
Fair Value |  |
Total securities AFS, at fair value | 157,209 | 164,955
Obligations of states and political subdivisions |  |
Available For Sale |  |
Amortized Cost | 2,497 | 825
Gross Unrealized Gains | 10 | 16
Gross Unrealized (Losses) | 0 | 0
Fair Value | 2,507 | 841
Amortized Cost |  |
Total securities AFS, at fair value | 2,497 | 825
Fair Value |  |
Total securities AFS, at fair value | 2,507 | 841
Non-bank qualified obligations of states and political subdivisions |  |
Available For Sale |  |
Amortized Cost | 266,048 | 314,819
Gross Unrealized Gains | 3,347 | 8,978
Gross Unrealized (Losses) | (1,100) | (23)
Fair Value | 268,295 | 323,774
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 101,046 | 6,265
Unrealized (Losses), Less than 12 months | (1,100) | (6)
Fair Value, 12 Months or Longer | 0 | 3,103
Unrealized (Losses), 12 Months or Longer | 0 | (17)
Fair Value, Total | 101,046 | 9,368
Unrealized (Losses), Total | (1,100) | (23)
Amortized Cost |  |
Total securities AFS, at fair value | 266,048 | 314,819
Fair Value |  |
Total securities AFS, at fair value | 268,295 | 323,774
Held To Maturity |  |
Amortized Cost | 52,944 | 87,183
Gross Unrealized Gains | 103 | 1,040
Gross Unrealized (Losses) | (471) | (29)
Fair Value | 52,576 | 88,194
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 26,096 | 7,397
OVER 12 MONTHS, Fair Value | 0 | 3,637
TOTAL, Fair Value | 26,096 | 11,034
LESS THAN 12 MONTHS, Unrealized (Losses) | (471) | (9)
OVER 12 MONTHS, Unrealized (Losses) | 0 | (20)
TOTAL, Unrealized (Losses) | (471) | (29)
AMORTIZED COST [Abstract] |  |
Total securities HTM, at cost | 52,944 | 87,183
FAIR VALUE [Abstract] |  |
Total securities HTM, at cost | 52,576 | 88,194
Asset-backed securities |  |
Available For Sale |  |
Amortized Cost | 393,103 | 329,139
Gross Unrealized Gains | 3,003 | 2,015
Gross Unrealized (Losses) | (1,247) | (6,229)
Fair Value | 394,859 | 324,925
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 127,110 | 106,474
Unrealized (Losses), Less than 12 months | (283) | (1,089)
Fair Value, 12 Months or Longer | 91,553 | 178,686
Unrealized (Losses), 12 Months or Longer | (964) | (5,140)
Fair Value, Total | 218,663 | 285,160
Unrealized (Losses), Total | (1,247) | (6,229)
Amortized Cost |  |
Total securities AFS, at fair value | 393,103 | 329,139
Fair Value |  |
Total securities AFS, at fair value | 394,859 | 324,925
Mortgage-backed securities |  |
Available For Sale |  |
Amortized Cost | 1,016,478 | 439,879
Gross Unrealized Gains | 9,728 | 14,567
Gross Unrealized (Losses) | (9,177) | (839)
Fair Value | 1,017,029 | 453,607
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 759,035 | 138,338
Unrealized (Losses), Less than 12 months | (7,418) | (839)
Fair Value, 12 Months or Longer | 60,792 | 0
Unrealized (Losses), 12 Months or Longer | (1,759) | 0
Fair Value, Total | 819,827 | 138,338
Unrealized (Losses), Total | (9,177) | (839)
Amortized Cost |  |
Total securities AFS, at fair value | 1,016,478 | 439,879
Fair Value |  |
Total securities AFS, at fair value | 1,017,029 | 453,607
Held To Maturity |  |
Amortized Cost | 3,725 | 5,427
Gross Unrealized Gains | 90 | 124
Gross Unrealized (Losses) | 0 | 0
Fair Value | 3,815 | 5,551
AMORTIZED COST [Abstract] |  |
Total securities HTM, at cost | 3,725 | 5,427
FAIR VALUE [Abstract] |  |
Total securities HTM, at cost | 3,815 | 5,551
Total debt securities AFS |  |
Available For Sale |  |
Amortized Cost | 1,855,084 | 1,244,384
Gross Unrealized Gains | 21,339 | 30,967
Gross Unrealized (Losses) | (11,524) | (7,249)
Fair Value | 1,864,899 | 1,268,102
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 987,191 | 283,334
Unrealized (Losses), Less than 12 months | (8,801) | (2,036)
Fair Value, 12 Months or Longer | 152,345 | 191,664
Unrealized (Losses), 12 Months or Longer | (2,723) | (5,213)
Fair Value, Total | 1,139,536 | 474,998
Unrealized (Losses), Total | (11,524) | (7,249)
Amortized Cost |  |
Total securities AFS, at fair value | 1,855,084 | 1,244,384
Fair Value |  |
Total securities AFS, at fair value | $ 1,864,899 | $ 1,268,102

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