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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | $ 1,729,835 | $ 1,944,298
Fair Value | 1,480,090 | 1,741,221
Amortized Cost |  |
Due in one year or less | 200 | 1,826
Due after one year through five years | 6,592 | 14,772
Due after five years through ten years | 45,866 | 70,894
Due after ten years | 426,825 | 463,257
Total | 479,483 | 550,749
Mortgage-backed securities | 1,250,352 | 1,393,549
Fair Value |  |
Due in one year or less | 199 | 1,796
Due after one year through five years | 6,372 | 14,211
Due after five years through ten years | 39,595 | 63,636
Due after ten years | 387,218 | 430,210
Total | 433,384 | 509,853
Mortgage-backed securities | 1,046,706 | 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) | (4,000) | (5,250)
Fair Value | 21,000 | 19,750
LESS THAN 12 MONTHS, Fair Value | 0 | 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | 0 | 0
OVER 12 MONTHS, Fair Value | 21,000 | 19,750
OVER 12 MONTHS, Gross Unrealized (Losses) | (4,000) | (5,250)
TOTAL, Fair Value | 21,000 | 19,750
TOTAL, Gross Unrealized (Losses) | (4,000) | (5,250)
SBA securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 34,501 | 86,036
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (3,972) | (4,101)
Fair Value | 30,529 | 81,935
LESS THAN 12 MONTHS, Fair Value | 0 | 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | 0 | 0
OVER 12 MONTHS, Fair Value | 30,528 | 81,935
OVER 12 MONTHS, Gross Unrealized (Losses) | (3,972) | (4,101)
TOTAL, Fair Value | 30,528 | 81,935
TOTAL, Gross Unrealized (Losses) | (3,972) | (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 | 235,137 | 246,233
Gross Unrealized Gains | 24 | 44
Gross Unrealized (Losses) | (34,436) | (28,287)
Fair Value | 200,725 | 217,990
LESS THAN 12 MONTHS, Fair Value | 0 | 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | 0 | 0
OVER 12 MONTHS, Fair Value | 198,747 | 215,956
OVER 12 MONTHS, Gross Unrealized (Losses) | (34,436) | (28,287)
TOTAL, Fair Value | 198,747 | 215,956
TOTAL, Gross Unrealized (Losses) | (34,436) | (28,287)
Asset-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 184,645 | 192,979
Gross Unrealized Gains | 322 | 337
Gross Unrealized (Losses) | (4,037) | (3,618)
Fair Value | 180,930 | 189,698
LESS THAN 12 MONTHS, Fair Value | 48,261 | 52,101
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (280) | (176)
OVER 12 MONTHS, Fair Value | 84,879 | 88,576
OVER 12 MONTHS, Gross Unrealized (Losses) | (3,757) | (3,442)
TOTAL, Fair Value | 133,140 | 140,677
TOTAL, Gross Unrealized (Losses) | (4,037) | (3,618)
Mortgage-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,250,352 | 1,393,549
Gross Unrealized Gains | 0 | 84
Gross Unrealized (Losses) | (203,646) | (162,265)
Fair Value | 1,046,706 | 1,231,368
LESS THAN 12 MONTHS, Fair Value | 15,390 | 2,377
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (249) | (15)
OVER 12 MONTHS, Fair Value | 1,031,316 | 1,215,781
OVER 12 MONTHS, Gross Unrealized (Losses) | (203,397) | (162,250)
TOTAL, Fair Value | 1,046,706 | 1,218,158
TOTAL, Gross Unrealized (Losses) | (203,646) | (162,265)
Total debt securities AFS |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,729,835 | 1,944,298
Gross Unrealized Gains | 346 | 465
Gross Unrealized (Losses) | (250,091) | (203,542)
Fair Value | 1,480,090 | 1,741,221
LESS THAN 12 MONTHS, Fair Value | 63,651 | 54,478
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (529) | (191)
OVER 12 MONTHS, Fair Value | 1,366,470 | 1,622,278
OVER 12 MONTHS, Gross Unrealized (Losses) | (249,562) | (203,351)
TOTAL, Fair Value | 1,430,121 | 1,676,756
TOTAL, Gross Unrealized (Losses) | $ (250,091) | $ (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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