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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
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Available-for-sale debt securities [Abstract] |  |
Amortized Cost | $ 2,190,638 | $ 2,165,719
Fair Value | 1,914,271 | 1,882,869
Amortized Cost |  |
Due in one year or less | 4,784 | 718
Due after one year through five years | 4,814 | 9,921
Due after five years through ten years | 86,500 | 89,921
Due after ten years | 568,240 | 483,707
Total | 664,338 | 584,267
Mortgage-backed securities | 1,526,300 | 1,581,452
Fair Value |  |
Due in one year or less | 4,728 | 715
Due after one year through five years | 4,400 | 9,395
Due after five years through ten years | 75,126 | 81,819
Due after ten years | 520,353 | 441,943
Total | 604,607 | 533,872
Mortgage-backed securities | 1,309,664 | 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 | 98,342 | 105,238
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (7,737) | (7,470)
Fair Value | 90,605 | 97,768
LESS THAN 12 MONTHS, Fair Value | 39,964 | 97,767
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (2,048) | (7,470)
OVER 12 MONTHS, Fair Value | 50,641 | 0
OVER 12 MONTHS, Gross Unrealized (Losses) | (5,689) | 0
TOTAL, Fair Value | 90,605 | 97,767
TOTAL, Gross Unrealized (Losses) | (7,737) | (7,470)
Obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,384 | 2,469
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (73) | (125)
Fair Value | 2,311 | 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 | 2,311 | 0
OVER 12 MONTHS, Gross Unrealized (Losses) | (73) | 0
TOTAL, Fair Value | 2,311 | 2,345
TOTAL, Gross Unrealized (Losses) | (73) | (125)
Non-bank qualified obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 272,818 | 290,754
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (34,443) | (26,971)
Fair Value | 238,375 | 263,783
LESS THAN 12 MONTHS, Fair Value | 38,703 | 195,816
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (2,128) | (19,743)
OVER 12 MONTHS, Fair Value | 198,715 | 67,967
OVER 12 MONTHS, Gross Unrealized (Losses) | (32,315) | (7,228)
TOTAL, Fair Value | 237,418 | 263,783
TOTAL, Gross Unrealized (Losses) | (34,443) | (26,971)
Asset-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 265,794 | 160,806
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (11,228) | (13,016)
Fair Value | 254,566 | 147,790
LESS THAN 12 MONTHS, Fair Value | 98,655 | 64,886
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (1,170) | (1,838)
OVER 12 MONTHS, Fair Value | 155,911 | 82,904
OVER 12 MONTHS, Gross Unrealized (Losses) | (10,058) | (11,178)
TOTAL, Fair Value | 254,566 | 147,790
TOTAL, Gross Unrealized (Losses) | (11,228) | (13,016)
Mortgage-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,526,300 | 1,581,452
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (216,636) | (232,455)
Fair Value | 1,309,664 | 1,348,997
LESS THAN 12 MONTHS, Fair Value | 284,959 | 816,657
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (16,159) | (106,583)
OVER 12 MONTHS, Fair Value | 1,021,679 | 532,340
OVER 12 MONTHS, Gross Unrealized (Losses) | (200,477) | (125,872)
TOTAL, Fair Value | 1,306,638 | 1,348,997
TOTAL, Gross Unrealized (Losses) | (216,636) | (232,455)
Total debt securities AFS |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,190,638 | 2,165,719
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (276,367) | (282,850)
Fair Value | 1,914,271 | 1,882,869
LESS THAN 12 MONTHS, Fair Value | 462,281 | 1,177,471
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (21,505) | (135,759)
OVER 12 MONTHS, Fair Value | 1,448,007 | 705,398
OVER 12 MONTHS, Gross Unrealized (Losses) | (254,862) | (147,091)
TOTAL, Fair Value | 1,910,288 | 1,882,869
TOTAL, Gross Unrealized (Losses) | $ (276,367) | $ (282,850)

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-4 + Details
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