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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2022
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Available-for-sale debt securities [Abstract] |  |
Amortized Cost | $ 2,115,921 | $ 2,165,719
Fair Value | 1,847,778 | 1,882,869
Amortized Cost |  |
Due in one year or less | 1,788 | 718
Due after one year through five years | 8,834 | 9,921
Due after five years through ten years | 89,916 | 89,921
Due after ten years | 460,447 | 483,707
Total | 560,985 | 584,267
Mortgage-backed securities | 1,554,936 | 1,581,452
Fair Value |  |
Due in one year or less | 1,783 | 715
Due after one year through five years | 8,349 | 9,395
Due after five years through ten years | 81,020 | 81,819
Due after ten years | 421,604 | 441,943
Total | 512,756 | 533,872
Mortgage-backed securities | 1,335,022 | 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) | (3,688) | (2,813)
Fair Value | 21,312 | 22,187
LESS THAN 12 MONTHS, Fair Value | 0 | 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | 0 | 0
OVER 12 MONTHS, Fair Value | 21,313 | 22,187
OVER 12 MONTHS, Gross Unrealized (Losses) | (3,688) | (2,813)
TOTAL, Fair Value | 21,313 | 22,187
TOTAL, Gross Unrealized (Losses) | (3,688) | (2,813)
SBA securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 103,325 | 105,238
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (7,560) | (7,470)
Fair Value | 95,765 | 97,768
LESS THAN 12 MONTHS, Fair Value | 79,470 | 97,767
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (4,652) | (7,470)
OVER 12 MONTHS, Fair Value | 16,294 | 0
OVER 12 MONTHS, Gross Unrealized (Losses) | (2,908) | 0
TOTAL, Fair Value | 95,764 | 97,767
TOTAL, Gross Unrealized (Losses) | (7,560) | (7,470)
Obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,453 | 2,469
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (102) | (125)
Fair Value | 2,351 | 2,344
LESS THAN 12 MONTHS, Fair Value | 255 | 2,345
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (17) | (125)
OVER 12 MONTHS, Fair Value | 2,096 | 0
OVER 12 MONTHS, Gross Unrealized (Losses) | (85) | 0
TOTAL, Fair Value | 2,351 | 2,345
TOTAL, Gross Unrealized (Losses) | (102) | (125)
Non-bank qualified obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 283,301 | 290,754
Gross Unrealized Gains | 10 | 0
Gross Unrealized (Losses) | (25,259) | (26,971)
Fair Value | 258,052 | 263,783
LESS THAN 12 MONTHS, Fair Value | 115,532 | 195,816
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (9,588) | (19,743)
OVER 12 MONTHS, Fair Value | 141,555 | 67,967
OVER 12 MONTHS, Gross Unrealized (Losses) | (15,671) | (7,228)
TOTAL, Fair Value | 257,087 | 263,783
TOTAL, Gross Unrealized (Losses) | (25,259) | (26,971)
Asset-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 146,906 | 160,806
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (11,630) | (13,016)
Fair Value | 135,276 | 147,790
LESS THAN 12 MONTHS, Fair Value | 59,854 | 64,886
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (2,236) | (1,838)
OVER 12 MONTHS, Fair Value | 75,422 | 82,904
OVER 12 MONTHS, Gross Unrealized (Losses) | (9,394) | (11,178)
TOTAL, Fair Value | 135,276 | 147,790
TOTAL, Gross Unrealized (Losses) | (11,630) | (13,016)
Mortgage-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,554,936 | 1,581,452
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (219,914) | (232,455)
Fair Value | 1,335,022 | 1,348,997
LESS THAN 12 MONTHS, Fair Value | 760,800 | 816,657
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (88,928) | (106,583)
OVER 12 MONTHS, Fair Value | 574,222 | 532,340
OVER 12 MONTHS, Gross Unrealized (Losses) | (130,986) | (125,872)
TOTAL, Fair Value | 1,335,022 | 1,348,997
TOTAL, Gross Unrealized (Losses) | (219,914) | (232,455)
Total debt securities AFS |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,115,921 | 2,165,719
Gross Unrealized Gains | 10 | 0
Gross Unrealized (Losses) | (268,153) | (282,850)
Fair Value | 1,847,778 | 1,882,869
LESS THAN 12 MONTHS, Fair Value | 1,015,911 | 1,177,471
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (105,421) | (135,759)
OVER 12 MONTHS, Fair Value | 830,902 | 705,398
OVER 12 MONTHS, Gross Unrealized (Losses) | (162,732) | (147,091)
TOTAL, Fair Value | 1,846,813 | 1,882,869
TOTAL, Gross Unrealized (Losses) | $ (268,153) | $ (282,850)

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