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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019
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Available-for-sale debt securities [Abstract] |  |
Amortized cost | $ 1,209,530 | $ 1,263,888
Debt securities available for sale | 1,214,723 | 1,272,493
Amortized Cost |  |
Due in one year or less | 666 | 0
Due after one year through five years | 16,081 | 16,749
Due after five years through ten years | 49,732 | 50,263
Due after ten years | 784,981 | 818,206
Total | 851,460 | 885,218
Mortgage-backed securities | 358,070 | 378,670
Fair Value |  |
Due in one year or less | 667 | 0
Due after one year through five years | 16,403 | 17,143
Due after five years through ten years | 50,850 | 51,840
Due after ten years | 784,683 | 820,964
Total | 852,603 | 889,947
Mortgage-backed securities | 362,120 | 382,546
Small Business Administration Securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 178,500 | 182,327
Gross unrealized gains | 2,446 | 3,655
Gross unrealized (losses) | (26) | 0
Debt securities available for sale | 180,920 | 185,982
LESS THAN 12 MONTHS, Fair Value | 13,583 | 10,262
LESS THAN 12 MONTHS, Unrealized (Losses) | (26) | 0
OVER 12 MONTHS, Fair Value | 0 | 0
OVER 12 MONTHS, Unrealized (Losses) | 0 | 0
TOTAL, Fair Value | 13,583 | 10,262
TOTAL, Unrealized (Losses) | (26) | 0
Obligations of States and Political Subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 858 | 858
Gross unrealized gains | 16 | 16
Gross unrealized (losses) | 0 | 0
Debt securities available for sale | 874 | 874
Non-bank Qualified Obligations of States and Political Subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 369,676 | 396,430
Gross unrealized gains | 5,236 | 5,030
Gross unrealized (losses) | (923) | (903)
Debt securities available for sale | 373,989 | 400,557
LESS THAN 12 MONTHS, Fair Value | 60,135 | 66,326
LESS THAN 12 MONTHS, Unrealized (Losses) | (226) | (177)
OVER 12 MONTHS, Fair Value | 50,431 | 55,428
OVER 12 MONTHS, Unrealized (Losses) | (697) | (726)
TOTAL, Fair Value | 110,566 | 121,754
TOTAL, Unrealized (Losses) | (923) | (903)
Asset-backed Securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 302,426 | 305,603
Gross unrealized gains | 195 | 262
Gross unrealized (losses) | (5,801) | (3,331)
Debt securities available for sale | 296,820 | 302,534
LESS THAN 12 MONTHS, Fair Value | 147,594 | 158,176
LESS THAN 12 MONTHS, Unrealized (Losses) | (1,920) | (1,823)
OVER 12 MONTHS, Fair Value | 124,114 | 93,259
OVER 12 MONTHS, Unrealized (Losses) | (3,881) | (1,508)
TOTAL, Fair Value | 271,708 | 251,435
TOTAL, Unrealized (Losses) | (5,801) | (3,331)
Mortgage-backed Securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 358,070 | 378,670
Gross unrealized gains | 5,518 | 5,731
Gross unrealized (losses) | (1,468) | (1,855)
Debt securities available for sale | 362,120 | 382,546
LESS THAN 12 MONTHS, Fair Value | 1,704 | 1,713
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 | (1)
OVER 12 MONTHS, Fair Value | 85,715 | 89,634
OVER 12 MONTHS, Unrealized (Losses) | (1,468) | (1,854)
TOTAL, Fair Value | 87,419 | 91,347
TOTAL, Unrealized (Losses) | (1,468) | (1,855)
Debt Securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 1,209,530 | 1,263,888
Gross unrealized gains | 13,411 | 14,694
Gross unrealized (losses) | (8,218) | (6,089)
Debt securities available for sale | 1,214,723 | 1,272,493
LESS THAN 12 MONTHS, Fair Value | 223,016 | 236,477
LESS THAN 12 MONTHS, Unrealized (Losses) | (2,172) | (2,001)
OVER 12 MONTHS, Fair Value | 260,260 | 238,321
OVER 12 MONTHS, Unrealized (Losses) | (6,046) | (4,088)
TOTAL, Fair Value | 483,276 | 474,798
TOTAL, Unrealized (Losses) | $ (8,218) | $ (6,089)

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