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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
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Available-for-sale debt securities [Abstract] |  |
Amortized Cost | $ 1,464,144 | $ 1,244,384
Fair Value | 1,480,780 | 1,268,102
Amortized Cost |  |
Due in one year or less | 245 | 1,385
Due after one year through five years | 17,621 | 20,805
Due after five years through ten years | 51,152 | 32,441
Due after ten years | 841,942 | 749,874
Total | 910,960 | 804,505
Mortgage-backed securities | 553,184 | 439,879
Fair Value |  |
Due in one year or less | 247 | 1,398
Due after one year through five years | 18,199 | 21,769
Due after five years through ten years | 52,585 | 34,025
Due after ten years | 850,916 | 757,303
Total | 921,947 | 814,495
Mortgage-backed securities | 558,833 | 453,607
SBA securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 166,348 | 159,722
Gross Unrealized Gains | 3,846 | 5,391
Gross Unrealized (Losses) | (188) | (158)
Fair Value | 170,006 | 164,955
LESS THAN 12 MONTHS, Fair Value | 25,310 | 32,257
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (24) | (102)
OVER 12 MONTHS, Fair Value | 31,825 | 9,875
OVER 12 MONTHS, Gross Unrealized (Losses) | (164) | (56)
TOTAL, Fair Value | 57,135 | 42,132
TOTAL, Gross Unrealized (Losses) | (188) | (158)
Obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,807 | 825
Gross Unrealized Gains | 10 | 16
Gross Unrealized (Losses) | (1) | 0
Fair Value | 2,816 | 841
LESS THAN 12 MONTHS, Fair Value | 1,980 |
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (1) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Gross Unrealized (Losses) | 0 |
TOTAL, Fair Value | 1,980 |
TOTAL, Gross Unrealized (Losses) | (1) |
Non-bank qualified obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 288,119 | 314,819
Gross Unrealized Gains | 8,285 | 8,978
Gross Unrealized (Losses) | (682) | (23)
Fair Value | 295,722 | 323,774
LESS THAN 12 MONTHS, Fair Value | 53,328 | 6,265
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (682) | (6)
OVER 12 MONTHS, Fair Value | 0 | 3,103
OVER 12 MONTHS, Gross Unrealized (Losses) | 0 | (17)
TOTAL, Fair Value | 53,328 | 9,368
TOTAL, Gross Unrealized (Losses) | (682) | (23)
Asset-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 453,686 | 329,139
Gross Unrealized Gains | 2,726 | 2,015
Gross Unrealized (Losses) | (3,009) | (6,229)
Fair Value | 453,403 | 324,925
LESS THAN 12 MONTHS, Fair Value | 75,473 | 106,474
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (782) | (1,089)
OVER 12 MONTHS, Fair Value | 189,365 | 178,686
OVER 12 MONTHS, Gross Unrealized (Losses) | (2,227) | (5,140)
TOTAL, Fair Value | 264,838 | 285,160
TOTAL, Gross Unrealized (Losses) | (3,009) | (6,229)
Mortgage-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 553,184 | 439,879
Gross Unrealized Gains | 11,613 | 14,567
Gross Unrealized (Losses) | (5,964) | (839)
Fair Value | 558,833 | 453,607
LESS THAN 12 MONTHS, Fair Value | 291,358 | 138,338
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (5,088) | (839)
OVER 12 MONTHS, Fair Value | 35,484 | 0
OVER 12 MONTHS, Gross Unrealized (Losses) | (876) | 0
TOTAL, Fair Value | 326,842 | 138,338
TOTAL, Gross Unrealized (Losses) | (5,964) | (839)
Total debt securities AFS |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,464,144 | 1,244,384
Gross Unrealized Gains | 26,480 | 30,967
Gross Unrealized (Losses) | (9,844) | (7,249)
Fair Value | 1,480,780 | 1,268,102
LESS THAN 12 MONTHS, Fair Value | 447,449 | 283,334
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (6,577) | (2,036)
OVER 12 MONTHS, Fair Value | 256,674 | 191,664
OVER 12 MONTHS, Gross Unrealized (Losses) | (3,267) | (5,213)
TOTAL, Fair Value | 704,123 | 474,998
TOTAL, Gross Unrealized (Losses) | $ (9,844) | $ (7,249)

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