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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
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Available-for-sale debt securities [Abstract] |  |
Amortized Cost | $ 2,075,257 | $ 2,165,719
Fair Value | 1,825,563 | 1,882,869
Amortized Cost |  |
Due in one year or less | 3,785 | 718
Due after one year through five years | 5,830 | 9,921
Due after five years through ten years | 86,540 | 89,921
Due after ten years | 444,746 | 483,707
Total | 540,901 | 584,267
Mortgage-backed securities | 1,534,356 | 1,581,452
Fair Value |  |
Due in one year or less | 3,728 | 715
Due after one year through five years | 5,468 | 9,395
Due after five years through ten years | 76,745 | 81,819
Due after ten years | 405,611 | 441,943
Total | 491,552 | 533,872
Mortgage-backed securities | 1,334,011 | 1,348,997
Corporate securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 25,000 | 25,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (6,250) | (2,813)
Fair Value | 18,750 | 22,187
LESS THAN 12 MONTHS, Fair Value | 0 | 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | 0 | 0
OVER 12 MONTHS, Fair Value | 18,750 | 22,187
OVER 12 MONTHS, Gross Unrealized (Losses) | (6,250) | (2,813)
TOTAL, Fair Value | 18,750 | 22,187
TOTAL, Gross Unrealized (Losses) | (6,250) | (2,813)
SBA securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 99,670 | 105,238
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (5,422) | (7,470)
Fair Value | 94,248 | 97,768
LESS THAN 12 MONTHS, Fair Value | 41,231 | 97,767
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (1,166) | (7,470)
OVER 12 MONTHS, Fair Value | 53,016 | 0
OVER 12 MONTHS, Gross Unrealized (Losses) | (4,256) | 0
TOTAL, Fair Value | 94,247 | 97,767
TOTAL, Gross Unrealized (Losses) | (5,422) | (7,470)
Obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,436 | 2,469
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (79) | (125)
Fair Value | 2,357 | 2,344
LESS THAN 12 MONTHS, Fair Value | 0 | 2,345
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | 0 | (125)
OVER 12 MONTHS, Fair Value | 2,357 | 0
OVER 12 MONTHS, Gross Unrealized (Losses) | (79) | 0
TOTAL, Fair Value | 2,357 | 2,345
TOTAL, Gross Unrealized (Losses) | (79) | (125)
Non-bank qualified obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 277,767 | 290,754
Gross Unrealized Gains | 37 | 0
Gross Unrealized (Losses) | (28,311) | (26,971)
Fair Value | 249,493 | 263,783
LESS THAN 12 MONTHS, Fair Value | 65,300 | 195,816
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (4,118) | (19,743)
OVER 12 MONTHS, Fair Value | 183,201 | 67,967
OVER 12 MONTHS, Gross Unrealized (Losses) | (24,193) | (7,228)
TOTAL, Fair Value | 248,501 | 263,783
TOTAL, Gross Unrealized (Losses) | (28,311) | (26,971)
Asset-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 136,028 | 160,806
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (9,324) | (13,016)
Fair Value | 126,704 | 147,790
LESS THAN 12 MONTHS, Fair Value | 0 | 64,886
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | 0 | (1,838)
OVER 12 MONTHS, Fair Value | 126,704 | 82,904
OVER 12 MONTHS, Gross Unrealized (Losses) | (9,324) | (11,178)
TOTAL, Fair Value | 126,704 | 147,790
TOTAL, Gross Unrealized (Losses) | (9,324) | (13,016)
Mortgage-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,534,356 | 1,581,452
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (200,345) | (232,455)
Fair Value | 1,334,011 | 1,348,997
LESS THAN 12 MONTHS, Fair Value | 296,523 | 816,657
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (14,199) | (106,583)
OVER 12 MONTHS, Fair Value | 1,037,488 | 532,340
OVER 12 MONTHS, Gross Unrealized (Losses) | (186,146) | (125,872)
TOTAL, Fair Value | 1,334,011 | 1,348,997
TOTAL, Gross Unrealized (Losses) | (200,345) | (232,455)
Total debt securities AFS |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,075,257 | 2,165,719
Gross Unrealized Gains | 37 | 0
Gross Unrealized (Losses) | (249,731) | (282,850)
Fair Value | 1,825,563 | 1,882,869
LESS THAN 12 MONTHS, Fair Value | 403,054 | 1,177,471
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (19,483) | (135,759)
OVER 12 MONTHS, Fair Value | 1,421,516 | 705,398
OVER 12 MONTHS, Gross Unrealized (Losses) | (230,248) | (147,091)
TOTAL, Fair Value | 1,824,570 | 1,882,869
TOTAL, Gross Unrealized (Losses) | $ (249,731) | $ (282,850)

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