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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | $ 1,628,521 | $ 1,944,298
Fair Value | 1,411,520 | 1,741,221
Amortized Cost |  |
Due in one year or less | 380 | 1,826
Due after one year through five years | 1,750 | 14,772
Due after five years through ten years | 40,206 | 70,894
Due after ten years | 378,704 | 463,257
Total | 421,040 | 550,749
Mortgage-backed securities | 1,207,481 | 1,393,549
Fair Value |  |
Due in one year or less | 382 | 1,796
Due after one year through five years | 1,773 | 14,211
Due after five years through ten years | 36,413 | 63,636
Due after ten years | 343,934 | 430,210
Total | 382,502 | 509,853
Mortgage-backed securities | 1,029,018 | 1,231,368
Corporate securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 25,000 | 25,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (3,875) | (5,250)
Fair Value | 21,125 | 19,750
LESS THAN 12 MONTHS, Fair Value | 0 | 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | 0 | 0
OVER 12 MONTHS, Fair Value | 21,125 | 19,750
OVER 12 MONTHS, Gross Unrealized (Losses) | (3,875) | (5,250)
TOTAL, Fair Value | 21,125 | 19,750
TOTAL, Gross Unrealized (Losses) | (3,875) | (5,250)
SBA securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 13,122 | 86,036
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (1,208) | (4,101)
Fair Value | 11,914 | 81,935
LESS THAN 12 MONTHS, Fair Value | 0 | 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | 0 | 0
OVER 12 MONTHS, Fair Value | 11,914 | 81,935
OVER 12 MONTHS, Gross Unrealized (Losses) | (1,208) | (4,101)
TOTAL, Fair Value | 11,914 | 81,935
TOTAL, Gross Unrealized (Losses) | (1,208) | (4,101)
Obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 200 | 501
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | 0 | (21)
Fair Value | 200 | 480
LESS THAN 12 MONTHS, Fair Value |  | 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) |  | 0
OVER 12 MONTHS, Fair Value |  | 280
OVER 12 MONTHS, Gross Unrealized (Losses) |  | (21)
TOTAL, Fair Value |  | 280
TOTAL, Gross Unrealized (Losses) |  | (21)
Non-bank qualified obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 223,512 | 246,233
Gross Unrealized Gains | 26 | 44
Gross Unrealized (Losses) | (31,536) | (28,287)
Fair Value | 192,002 | 217,990
LESS THAN 12 MONTHS, Fair Value | 0 | 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | 0 | 0
OVER 12 MONTHS, Fair Value | 190,046 | 215,956
OVER 12 MONTHS, Gross Unrealized (Losses) | (31,536) | (28,287)
TOTAL, Fair Value | 190,046 | 215,956
TOTAL, Gross Unrealized (Losses) | (31,536) | (28,287)
Asset-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 159,206 | 192,979
Gross Unrealized Gains | 358 | 337
Gross Unrealized (Losses) | (2,303) | (3,618)
Fair Value | 157,261 | 189,698
LESS THAN 12 MONTHS, Fair Value | 36,156 | 52,101
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (313) | (176)
OVER 12 MONTHS, Fair Value | 63,930 | 88,576
OVER 12 MONTHS, Gross Unrealized (Losses) | (1,990) | (3,442)
TOTAL, Fair Value | 100,086 | 140,677
TOTAL, Gross Unrealized (Losses) | (2,303) | (3,618)
Mortgage-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,207,481 | 1,393,549
Gross Unrealized Gains | 13 | 84
Gross Unrealized (Losses) | (178,476) | (162,265)
Fair Value | 1,029,018 | 1,231,368
LESS THAN 12 MONTHS, Fair Value | 14,473 | 2,377
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (123) | (15)
OVER 12 MONTHS, Fair Value | 1,013,605 | 1,215,781
OVER 12 MONTHS, Gross Unrealized (Losses) | (178,353) | (162,250)
TOTAL, Fair Value | 1,028,078 | 1,218,158
TOTAL, Gross Unrealized (Losses) | (178,476) | (162,265)
Total debt securities AFS |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,628,521 | 1,944,298
Gross Unrealized Gains | 397 | 465
Gross Unrealized (Losses) | (217,398) | (203,542)
Fair Value | 1,411,520 | 1,741,221
LESS THAN 12 MONTHS, Fair Value | 50,629 | 54,478
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (436) | (191)
OVER 12 MONTHS, Fair Value | 1,300,620 | 1,622,278
OVER 12 MONTHS, Gross Unrealized (Losses) | (216,962) | (203,351)
TOTAL, Fair Value | 1,351,249 | 1,676,756
TOTAL, Gross Unrealized (Losses) | $ (217,398) | $ (203,542)

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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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