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SECURITIES - Schedule of Securities Available (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Available For Sale |  |
Amortized Cost | $ 1,244,384 | $ 1,263,888
Gross Unrealized Gains | 30,967 | 14,694
Gross Unrealized (Losses) | (7,249) | (6,089)
Fair Value | 1,268,102 | 1,272,493
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 283,334 | 236,477
Unrealized (Losses), Less than 12 months | (2,036) | (2,001)
Fair Value, 12 Months or Longer | 191,664 | 238,321
Unrealized (Losses), 12 Months or Longer | (5,213) | (4,088)
Fair Value, Total | 474,998 | 474,798
Unrealized (Losses), Total | (7,249) | (6,089)
Amortized Cost |  |
Due in one year or less | 1,385 | 0
Due after one year through five years | 20,805 | 16,749
Due after five years through ten years | 32,441 | 50,263
Due after ten years | 749,874 | 818,206
Total Amortized Cost | 804,505 | 885,218
Mortgage-backed securities | 439,879 | 378,670
Total securities AFS, at fair value | 1,244,384 | 1,263,888
Fair Value |  |
Due in one year or less | 1,398 | 0
Due after one year through five years | 21,769 | 17,143
Due after five years through ten years | 34,025 | 51,840
Due after ten years | 757,303 | 820,964
Total Fair Value | 814,495 | 889,947
Mortgage-backed securities | 453,607 | 382,546
Fair Value | 1,268,102 | 1,272,493
Held To Maturity |  |
Amortized Cost | 92,610 | 134,764
Gross Unrealized Gains | 1,164 | 122
Gross Unrealized (Losses) | (29) | (1,416)
Fair Value | 93,745 | 133,470
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 7,397 | 7,438
OVER 12 MONTHS, Fair Value | 3,637 | 111,171
TOTAL, Fair Value | 11,034 | 118,609
LESS THAN 12 MONTHS, Unrealized (Losses) | (9) | (6)
OVER 12 MONTHS, Unrealized (Losses) | (20) | (1,410)
TOTAL, Unrealized (Losses) | (29) | (1,416)
AMORTIZED COST [Abstract] |  |
Due after ten years | 87,183 | 127,582
Total Amortized Cost | 87,183 | 127,582
Mortgage-backed securities | 5,427 | 7,182
Total securities HTM, at cost | 92,610 | 134,764
FAIR VALUE [Abstract] |  |
Due after ten years | 88,194 | 126,287
Total Fair Value | 88,194 | 126,287
Mortgage-backed securities | 5,551 | 7,183
Total securities HTM, at cost | 93,745 | 133,470
SBA securities |  |
Available For Sale |  |
Amortized Cost | 159,722 | 182,327
Gross Unrealized Gains | 5,391 | 3,655
Gross Unrealized (Losses) | (158) | 0
Fair Value | 164,955 | 185,982
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 32,257 | 10,262
Unrealized (Losses), Less than 12 months | (102) | 0
Fair Value, 12 Months or Longer | 9,875 | 0
Unrealized (Losses), 12 Months or Longer | (56) | 0
Fair Value, Total | 42,132 | 10,262
Unrealized (Losses), Total | (158) | 0
Amortized Cost |  |
Total securities AFS, at fair value | 159,722 | 182,327
Fair Value |  |
Fair Value | 164,955 | 185,982
Obligation of states and political subdivisions |  |
Available For Sale |  |
Amortized Cost | 825 | 858
Gross Unrealized Gains | 16 | 16
Gross Unrealized (Losses) | 0 | 0
Fair Value | 841 | 874
Amortized Cost |  |
Total securities AFS, at fair value | 825 | 858
Fair Value |  |
Fair Value | 841 | 874
Non-bank qualified obligations of states and political subdivisions |  |
Available For Sale |  |
Amortized Cost | 314,819 | 396,430
Gross Unrealized Gains | 8,978 | 5,030
Gross Unrealized (Losses) | (23) | (903)
Fair Value | 323,774 | 400,557
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 6,265 | 66,326
Unrealized (Losses), Less than 12 months | (6) | (177)
Fair Value, 12 Months or Longer | 3,103 | 55,428
Unrealized (Losses), 12 Months or Longer | (17) | (726)
Fair Value, Total | 9,368 | 121,754
Unrealized (Losses), Total | (23) | (903)
Amortized Cost |  |
Total securities AFS, at fair value | 314,819 | 396,430
Fair Value |  |
Fair Value | 323,774 | 400,557
Held To Maturity |  |
Amortized Cost | 87,183 | 127,582
Gross Unrealized Gains | 1,040 | 108
Gross Unrealized (Losses) | (29) | (1,403)
Fair Value | 88,194 | 126,287
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 7,397 | 5,967
OVER 12 MONTHS, Fair Value | 3,637 | 109,368
TOTAL, Fair Value | 11,034 | 115,335
LESS THAN 12 MONTHS, Unrealized (Losses) | (9) | (6)
OVER 12 MONTHS, Unrealized (Losses) | (20) | (1,397)
TOTAL, Unrealized (Losses) | (29) | (1,403)
AMORTIZED COST [Abstract] |  |
Total securities HTM, at cost | 87,183 | 127,582
FAIR VALUE [Abstract] |  |
Total securities HTM, at cost | 88,194 | 126,287
Asset-backed securities |  |
Available For Sale |  |
Amortized Cost | 329,139 | 305,603
Gross Unrealized Gains | 2,015 | 262
Gross Unrealized (Losses) | (6,229) | (3,331)
Fair Value | 324,925 | 302,534
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 106,474 | 158,176
Unrealized (Losses), Less than 12 months | (1,089) | (1,823)
Fair Value, 12 Months or Longer | 178,686 | 93,259
Unrealized (Losses), 12 Months or Longer | (5,140) | (1,508)
Fair Value, Total | 285,160 | 251,435
Unrealized (Losses), Total | (6,229) | (3,331)
Amortized Cost |  |
Total securities AFS, at fair value | 329,139 | 305,603
Fair Value |  |
Fair Value | 324,925 | 302,534
Mortgage-backed securities |  |
Available For Sale |  |
Amortized Cost | 439,879 | 378,670
Gross Unrealized Gains | 14,567 | 5,731
Gross Unrealized (Losses) | (839) | (1,855)
Fair Value | 453,607 | 382,546
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 138,338 | 1,713
Unrealized (Losses), Less than 12 months | (839) | (1)
Fair Value, 12 Months or Longer | 0 | 89,634
Unrealized (Losses), 12 Months or Longer | 0 | (1,854)
Fair Value, Total | 138,338 | 91,347
Unrealized (Losses), Total | (839) | (1,855)
Amortized Cost |  |
Total securities AFS, at fair value | 439,879 | 378,670
Fair Value |  |
Fair Value | 453,607 | 382,546
Held To Maturity |  |
Amortized Cost | 5,427 | 7,182
Gross Unrealized Gains | 124 | 14
Gross Unrealized (Losses) | 0 | (13)
Fair Value | 5,551 | 7,183
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value |  | 1,471
OVER 12 MONTHS, Fair Value |  | 1,803
TOTAL, Fair Value |  | 3,274
LESS THAN 12 MONTHS, Unrealized (Losses) |  | 0
OVER 12 MONTHS, Unrealized (Losses) |  | (13)
TOTAL, Unrealized (Losses) |  | (13)
AMORTIZED COST [Abstract] |  |
Total securities HTM, at cost | 5,427 | 7,182
FAIR VALUE [Abstract] |  |
Total securities HTM, at cost | $ 5,551 | $ 7,183

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