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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
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Available-for-sale debt securities [Abstract] |  |
Amortized cost | $ 1,192,505 | $ 1,263,888
Debt securities available for sale | 1,195,619 | 1,272,493
Amortized Cost |  |
Due in one year or less | 1,130 | 0
Due after one year through five years | 12,689 | 16,749
Due after five years through ten years | 45,180 | 50,263
Due after ten years | 790,771 | 818,206
Total | 849,770 | 885,218
Mortgage-backed securities | 342,735 | 378,670
Fair Value |  |
Due in one year or less | 1,138 | 0
Due after one year through five years | 13,067 | 17,143
Due after five years through ten years | 47,086 | 51,840
Due after ten years | 779,234 | 820,964
Total | 840,525 | 889,947
Mortgage-backed securities | 355,094 | 382,546
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 7,438
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 6
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 92,418 | 111,171
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 767 | 1,410
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 92,418 | 118,609
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 767 | 1,416
Small Business Administration Securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 168,697 | 182,327
Gross unrealized gains | 4,569 | 3,655
Gross unrealized (losses) | (20) | 0
Debt securities available for sale | 173,246 | 185,982
LESS THAN 12 MONTHS, Fair Value | 19,536 | 10,262
LESS THAN 12 MONTHS, Unrealized (Losses) | (20) | 0
OVER 12 MONTHS, Fair Value | 0 | 0
OVER 12 MONTHS, Unrealized (Losses) | 0 | 0
TOTAL, Fair Value | 19,536 | 10,262
TOTAL, Unrealized (Losses) | (20) | 0
Obligations of States and Political Subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 858 | 858
Gross unrealized gains | 14 | 16
Gross unrealized (losses) | 0 | 0
Debt securities available for sale | 872 | 874
Non-bank Qualified Obligations of States and Political Subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 341,080 | 396,430
Gross unrealized gains | 5,587 | 5,030
Gross unrealized (losses) | (497) | (903)
Debt securities available for sale | 346,170 | 400,557
LESS THAN 12 MONTHS, Fair Value | 27,484 | 66,326
LESS THAN 12 MONTHS, Unrealized (Losses) | (37) | (177)
OVER 12 MONTHS, Fair Value | 46,259 | 55,428
OVER 12 MONTHS, Unrealized (Losses) | (460) | (726)
TOTAL, Fair Value | 73,743 | 121,754
TOTAL, Unrealized (Losses) | (497) | (903)
Fair Value |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 5,967
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 6
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 92,418 | 109,368
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 767 | 1,397
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 92,418 | 115,335
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 767 | 1,403
Asset-backed Securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 339,135 | 305,603
Gross unrealized gains | 0 | 262
Gross unrealized (losses) | (18,898) | (3,331)
Debt securities available for sale | 320,237 | 302,534
LESS THAN 12 MONTHS, Fair Value | 196,361 | 158,176
LESS THAN 12 MONTHS, Unrealized (Losses) | (7,499) | (1,823)
OVER 12 MONTHS, Fair Value | 123,876 | 93,259
OVER 12 MONTHS, Unrealized (Losses) | (11,399) | (1,508)
TOTAL, Fair Value | 320,237 | 251,435
TOTAL, Unrealized (Losses) | (18,898) | (3,331)
Mortgage-backed Securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 342,735 | 378,670
Gross unrealized gains | 12,359 | 5,731
Gross unrealized (losses) | 0 | (1,855)
Debt securities available for sale | 355,094 | 382,546
LESS THAN 12 MONTHS, Fair Value |  | 1,713
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (1)
OVER 12 MONTHS, Fair Value |  | 89,634
OVER 12 MONTHS, Unrealized (Losses) |  | (1,854)
TOTAL, Fair Value |  | 91,347
TOTAL, Unrealized (Losses) |  | (1,855)
Fair Value |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 1,471
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 1,803
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 13
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 3,274
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | 13
Debt Securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 1,192,505 | 1,263,888
Gross unrealized gains | 22,529 | 14,694
Gross unrealized (losses) | (19,415) | (6,089)
Debt securities available for sale | 1,195,619 | 1,272,493
LESS THAN 12 MONTHS, Fair Value | 243,381 | 236,477
LESS THAN 12 MONTHS, Unrealized (Losses) | (7,556) | (2,001)
OVER 12 MONTHS, Fair Value | 170,135 | 238,321
OVER 12 MONTHS, Unrealized (Losses) | (11,859) | (4,088)
TOTAL, Fair Value | 413,516 | 474,798
TOTAL, Unrealized (Losses) | $ (19,415) | $ (6,089)

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