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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Sep. 30, 2021
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Available-for-sale debt securities [Abstract] |  |
Amortized Cost | $ 2,131,916 | $ 1,855,084
Fair Value | 1,956,523 | 1,864,899
Amortized Cost |  |
Due in one year or less | 950 | 810
Due after one year through five years | 10,797 | 13,026
Due after five years through ten years | 68,339 | 50,785
Due after ten years | 463,838 | 773,985
Total | 543,924 | 838,606
Mortgage-backed securities | 1,587,992 | 1,016,478
Fair Value |  |
Due in one year or less | 955 | 822
Due after one year through five years | 10,489 | 13,378
Due after five years through ten years | 63,705 | 52,357
Due after ten years | 436,572 | 781,313
Total | 511,721 | 847,870
Mortgage-backed securities | 1,444,802 | 1,017,029
Corporate securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 25,000 | 25,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (1,562) | 0
Fair Value | 23,438 | 25,000
LESS THAN 12 MONTHS, Fair Value | 23,438 |
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (1,562) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Gross Unrealized (Losses) | 0 |
TOTAL, Fair Value | 23,438 |
TOTAL, Gross Unrealized (Losses) | (1,562) |
SBA securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 84,506 | 151,958
Gross Unrealized Gains | 247 | 5,251
Gross Unrealized (Losses) | (3,404) | 0
Fair Value | 81,349 | 157,209
LESS THAN 12 MONTHS, Fair Value | 73,758 |
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (3,404) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Gross Unrealized (Losses) | 0 |
TOTAL, Fair Value | 73,758 |
TOTAL, Gross Unrealized (Losses) | (3,404) |
Obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,726 | 2,497
Gross Unrealized Gains | 0 | 10
Gross Unrealized (Losses) | (85) | 0
Fair Value | 2,641 | 2,507
LESS THAN 12 MONTHS, Fair Value | 2,401 |
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (85) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Gross Unrealized (Losses) | 0 |
TOTAL, Fair Value | 2,401 |
TOTAL, Gross Unrealized (Losses) | (85) |
Non-bank qualified obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 260,069 | 266,048
Gross Unrealized Gains | 29 | 3,347
Gross Unrealized (Losses) | (15,137) | (1,100)
Fair Value | 244,961 | 268,295
LESS THAN 12 MONTHS, Fair Value | 237,769 | 101,046
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (14,823) | (1,100)
OVER 12 MONTHS, Fair Value | 3,414 | 0
OVER 12 MONTHS, Gross Unrealized (Losses) | (314) | 0
TOTAL, Fair Value | 241,183 | 101,046
TOTAL, Gross Unrealized (Losses) | (15,137) | (1,100)
Asset-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 171,623 | 393,103
Gross Unrealized Gains | 0 | 3,003
Gross Unrealized (Losses) | (12,291) | (1,247)
Fair Value | 159,332 | 394,859
LESS THAN 12 MONTHS, Fair Value | 96,852 | 127,110
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (6,435) | (283)
OVER 12 MONTHS, Fair Value | 62,481 | 91,553
OVER 12 MONTHS, Gross Unrealized (Losses) | (5,856) | (964)
TOTAL, Fair Value | 159,333 | 218,663
TOTAL, Gross Unrealized (Losses) | (12,291) | (1,247)
Mortgage-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,587,992 | 1,016,478
Gross Unrealized Gains | 655 | 9,728
Gross Unrealized (Losses) | (143,845) | (9,177)
Fair Value | 1,444,802 | 1,017,029
LESS THAN 12 MONTHS, Fair Value | 1,033,772 | 759,035
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (111,839) | (7,418)
OVER 12 MONTHS, Fair Value | 227,715 | 60,792
OVER 12 MONTHS, Gross Unrealized (Losses) | (32,006) | (1,759)
TOTAL, Fair Value | 1,261,487 | 819,827
TOTAL, Gross Unrealized (Losses) | (143,845) | (9,177)
Total debt securities AFS |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,131,916 | 1,855,084
Gross Unrealized Gains | 931 | 21,339
Gross Unrealized (Losses) | (176,324) | (11,524)
Fair Value | 1,956,523 | 1,864,899
LESS THAN 12 MONTHS, Fair Value | 1,467,990 | 987,191
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (138,148) | (8,801)
OVER 12 MONTHS, Fair Value | 293,610 | 152,345
OVER 12 MONTHS, Gross Unrealized (Losses) | (38,176) | (2,723)
TOTAL, Fair Value | 1,761,600 | 1,139,536
TOTAL, Gross Unrealized (Losses) | $ (176,324) | $ (11,524)

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