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SECURITIES - Schedule of Securities Available (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Available For Sale |  |
Amortized cost | $ 1,263,888 | $ 1,895,802
Gross unrealized gains |  | 4,096
Gross unrealized (losses) |  | (47,873)
Total securities | 1,272,493 | 1,852,025
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months |  | 950,499
Unrealized (Losses), Less than 12 months |  | (18,629)
Fair Value, 12 Months or Longer |  | 601,825
Unrealized (Losses), 12 Months or Longer |  | (29,244)
Fair Value, Total |  | 1,552,324
Unrealized (Losses), Total |  | (47,873)
AMORTIZED COST [Abstract] |  |
Due in one year or less | 0 | 2,532
Due after one year through five years | 16,749 | 41,415
Due after five years through ten years | 50,263 | 352,099
Due after ten years | 818,206 | 1,118,283
Total Amortized Cost | 885,218 | 1,514,329
Mortgage-backed securities | 378,670 | 378,301
Common equities and mutual funds |  | 3,172
Amortized cost | 1,263,888 | 1,895,802
FAIR VALUE [Abstract] |  |
Due in one year or less | 0 | 2,529
Due after one year through five years | 17,143 | 41,504
Due after five years through ten years | 51,840 | 350,143
Due after ten years | 820,964 | 1,089,984
Total Fair Value | 889,947 | 1,484,160
Mortgage-back securities | 382,546 | 364,065
Common equities and mutual funds |  | 3,800
Total securities | 1,272,493 | 1,852,025
Held To Maturity |  |
Amortized cost | 134,764 | 171,743
Gross unrealized gains | 122 | 0
Gross unrealized (losses) | (1,416) | (11,180)
Fair value | 133,470 | 160,563
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 7,438 | 5,767
OVER 12 MONTHS, Fair Value | 111,171 | 154,796
TOTAL, Fair Value | 118,609 | 160,563
LESS THAN 12 MONTHS, Unrealized (Losses) | (6) | (287)
OVER 12 MONTHS, Unrealized (Losses) | (1,410) | (10,893)
TOTAL, Unrealized (Losses) | (1,416) | (11,180)
AMORTIZED COST [Abstract] |  |
Due after ten years | 127,582 | 163,893
Total Amortized Cost | 127,582 | 163,893
Mortgage-backed securities | 7,182 | 7,850
Amortized cost | 134,764 | 171,743
FAIR VALUE [Abstract] |  |
Due after ten years | 126,287 | 153,135
Total Fair Value | 126,287 | 153,135
Mortgage-backed securities | 7,183 | 7,428
Total securities | 133,470 | 160,563
Small Business Administration Securities |  |
Available For Sale |  |
Amortized cost | 182,327 | 45,591
Gross unrealized gains | 3,655 | 1
Gross unrealized (losses) | 0 | (1,255)
Total securities | 185,982 | 44,337
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 10,262 | 43,097
Unrealized (Losses), Less than 12 months | 0 | (1,255)
Fair Value, 12 Months or Longer | 0 | 0
Unrealized (Losses), 12 Months or Longer | 0 | 0
Fair Value, Total | 10,262 | 43,097
Unrealized (Losses), Total | 0 | (1,255)
AMORTIZED COST [Abstract] |  |
Amortized cost | 182,327 | 45,591
FAIR VALUE [Abstract] |  |
Total securities | 185,982 | 44,337
US States and Political Subdivisions Debt Securities |  |
Available For Sale |  |
Amortized cost | 858 | 17,154
Gross unrealized gains | 16 | 49
Gross unrealized (losses) | 0 | (293)
Total securities | 874 | 16,910
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 0 | 11,036
Unrealized (Losses), Less than 12 months | 0 | (279)
Fair Value, 12 Months or Longer | 0 | 881
Unrealized (Losses), 12 Months or Longer | 0 | (14)
Fair Value, Total | 0 | 11,917
Unrealized (Losses), Total | 0 | (293)
AMORTIZED COST [Abstract] |  |
Amortized cost | 858 | 17,154
FAIR VALUE [Abstract] |  |
Total securities | 874 | 16,910
Non-Bank Qualified Obligation of States And Political Subdivisions |  |
Available For Sale |  |
Amortized cost | 396,430 | 1,140,884
Gross unrealized gains | 5,030 | 826
Gross unrealized (losses) | (903) | (31,825)
Total securities | 400,557 | 1,109,885
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 66,326 | 626,693
Unrealized (Losses), Less than 12 months | (177) | (13,539)
Fair Value, 12 Months or Longer | 55,428 | 358,095
Unrealized (Losses), 12 Months or Longer | (726) | (18,286)
Fair Value, Total | 121,754 | 984,788
Unrealized (Losses), Total | (903) | (31,825)
AMORTIZED COST [Abstract] |  |
Amortized cost | 396,430 | 1,140,884
FAIR VALUE [Abstract] |  |
Total securities | 400,557 | 1,109,885
Held To Maturity |  |
Amortized cost | 127,582 | 163,893
Gross unrealized gains | 108 | 0
Gross unrealized (losses) | (1,403) | (10,758)
Fair value | 126,287 | 153,135
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 5,967 | 5,767
OVER 12 MONTHS, Fair Value | 109,368 | 147,368
TOTAL, Fair Value | 115,335 | 153,135
LESS THAN 12 MONTHS, Unrealized (Losses) | (6) | (287)
OVER 12 MONTHS, Unrealized (Losses) | (1,397) | (10,471)
TOTAL, Unrealized (Losses) | (1,403) | (10,758)
AMORTIZED COST [Abstract] |  |
Amortized cost | 127,582 | 163,893
FAIR VALUE [Abstract] |  |
Total securities | 126,287 | 153,135
Asset-backed Securities |  |
Available For Sale |  |
Amortized cost | 305,603 | 310,700
Gross unrealized gains | 262 | 2,585
Gross unrealized (losses) | (3,331) | (257)
Total securities | 302,534 | 313,028
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 158,176 | 146,638
Unrealized (Losses), Less than 12 months | (1,823) | (257)
Fair Value, 12 Months or Longer | 93,259 | 0
Unrealized (Losses), 12 Months or Longer | (1,508) | 0
Fair Value, Total | 251,435 | 146,638
Unrealized (Losses), Total | (3,331) | (257)
AMORTIZED COST [Abstract] |  |
Amortized cost | 305,603 | 310,700
FAIR VALUE [Abstract] |  |
Total securities | 302,534 | 313,028
Collateralized Mortgage Backed Securities |  |
Available For Sale |  |
Amortized cost | 378,670 | 378,301
Gross unrealized gains | 5,731 | 0
Gross unrealized (losses) | (1,855) | (14,236)
Total securities | 382,546 | 364,065
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 1,713 | 121,217
Unrealized (Losses), Less than 12 months | (1) | (3,292)
Fair Value, 12 Months or Longer | 89,634 | 242,849
Unrealized (Losses), 12 Months or Longer | (1,854) | (10,944)
Fair Value, Total | 91,347 | 364,066
Unrealized (Losses), Total | (1,855) | (14,236)
AMORTIZED COST [Abstract] |  |
Amortized cost | 378,670 | 378,301
FAIR VALUE [Abstract] |  |
Total securities | 382,546 | 364,065
Held To Maturity |  |
Amortized cost | 7,182 | 7,850
Gross unrealized gains | 14 | 0
Gross unrealized (losses) | (13) | (422)
Fair value | 7,183 | 7,428
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 1,471 | 0
OVER 12 MONTHS, Fair Value | 1,803 | 7,428
TOTAL, Fair Value | 3,274 | 7,428
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 | 0
OVER 12 MONTHS, Unrealized (Losses) | (13) | (422)
TOTAL, Unrealized (Losses) | (13) | (422)
AMORTIZED COST [Abstract] |  |
Amortized cost | 7,182 | 7,850
FAIR VALUE [Abstract] |  |
Total securities | 7,183 | 7,428
Debt Securities |  |
Available For Sale |  |
Amortized cost | 1,263,888 | 1,892,630
Gross unrealized gains | 14,694 | 3,461
Gross unrealized (losses) | (6,089) | (47,866)
Total securities | 1,272,493 | 1,848,225
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 236,477 | 948,681
Unrealized (Losses), Less than 12 months | (2,001) | (18,622)
Fair Value, 12 Months or Longer | 238,321 | 601,825
Unrealized (Losses), 12 Months or Longer | (4,088) | (29,244)
Fair Value, Total | 474,798 | 1,550,506
Unrealized (Losses), Total | (6,089) | (47,866)
AMORTIZED COST [Abstract] |  |
Amortized cost | 1,263,888 | 1,892,630
FAIR VALUE [Abstract] |  |
Total securities | 1,272,493 | 1,848,225
Common Equities And Mutual Funds |  |
Available For Sale |  |
Amortized cost | 2,435 | 3,172
Gross unrealized gains | 171 | 635
Gross unrealized (losses) | 0 | (7)
Total securities | 2,606 | 3,800
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Fair Value, Less than 12 months | 0 | 1,818
Unrealized (Losses), Less than 12 months | 0 | (7)
Fair Value, 12 Months or Longer | 0 | 0
Unrealized (Losses), 12 Months or Longer | 0 | 0
Fair Value, Total | 0 | 1,818
Unrealized (Losses), Total | 0 | (7)
AMORTIZED COST [Abstract] |  |
Amortized cost | 2,435 | 3,172
FAIR VALUE [Abstract] |  |
Total securities | $ 2,606 | $ 3,800

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