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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023
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Available-for-sale debt securities [Abstract] |  |
Amortized Cost | $ 2,101,149 | $ 2,143,333
Fair Value | 1,850,581 | 1,804,228
Amortized Cost |  |
Due in one year or less | 3,597 | 5,023
Due after one year through five years | 11,172 | 11,175
Due after five years through ten years | 79,137 | 79,139
Due after ten years | 535,867 | 552,360
Total | 629,773 | 647,697
Mortgage-backed securities | 1,471,376 | 1,495,636
Fair Value |  |
Due in one year or less | 3,579 | 4,971
Due after one year through five years | 10,523 | 10,292
Due after five years through ten years | 68,613 | 66,428
Due after ten years | 492,288 | 497,012
Total | 575,003 | 578,703
Mortgage-backed securities | 1,275,578 | 1,225,525
Corporate securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 25,000 | 25,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (6,625) | (6,750)
Fair Value | 18,375 | 18,250
LESS THAN 12 MONTHS, Fair Value | 0 | 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | 0 | 0
OVER 12 MONTHS, Fair Value | 18,375 | 18,250
OVER 12 MONTHS, Gross Unrealized (Losses) | (6,625) | (6,750)
TOTAL, Fair Value | 18,375 | 18,250
TOTAL, Gross Unrealized (Losses) | (6,625) | (6,750)
SBA securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 94,458 | 95,549
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (6,726) | (10,307)
Fair Value | 87,732 | 85,242
LESS THAN 12 MONTHS, Fair Value | 23,502 | 22,327
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (742) | (1,919)
OVER 12 MONTHS, Fair Value | 64,229 | 62,915
OVER 12 MONTHS, Gross Unrealized (Losses) | (5,984) | (8,388)
TOTAL, Fair Value | 87,731 | 85,242
TOTAL, Gross Unrealized (Losses) | (6,726) | (10,307)
Obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,351 | 2,368
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (47) | (79)
Fair Value | 2,304 | 2,289
LESS THAN 12 MONTHS, Fair Value | 0 | 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | 0 | 0
OVER 12 MONTHS, Fair Value | 2,304 | 2,289
OVER 12 MONTHS, Gross Unrealized (Losses) | (47) | (79)
TOTAL, Fair Value | 2,304 | 2,289
TOTAL, Gross Unrealized (Losses) | (47) | (79)
Non-bank qualified obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 262,999 | 269,396
Gross Unrealized Gains | 25 | 0
Gross Unrealized (Losses) | (34,136) | (42,673)
Fair Value | 228,888 | 226,723
LESS THAN 12 MONTHS, Fair Value | 1,616 | 5,010
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (18) | (83)
OVER 12 MONTHS, Fair Value | 225,198 | 221,714
OVER 12 MONTHS, Gross Unrealized (Losses) | (34,118) | (42,590)
TOTAL, Fair Value | 226,814 | 226,723
TOTAL, Gross Unrealized (Losses) | (34,136) | (42,673)
Asset-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 244,965 | 255,384
Gross Unrealized Gains | 96 | 234
Gross Unrealized (Losses) | (7,357) | (9,419)
Fair Value | 237,704 | 246,199
LESS THAN 12 MONTHS, Fair Value | 86,695 | 46,528
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (257) | (224)
OVER 12 MONTHS, Fair Value | 112,043 | 115,608
OVER 12 MONTHS, Gross Unrealized (Losses) | (7,100) | (9,195)
TOTAL, Fair Value | 198,738 | 162,136
TOTAL, Gross Unrealized (Losses) | (7,357) | (9,419)
Mortgage-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,471,376 | 1,495,636
Gross Unrealized Gains | 27 | 0
Gross Unrealized (Losses) | (195,825) | (270,111)
Fair Value | 1,275,578 | 1,225,525
LESS THAN 12 MONTHS, Fair Value | 17,688 | 18,311
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (245) | (944)
OVER 12 MONTHS, Fair Value | 1,256,811 | 1,207,214
OVER 12 MONTHS, Gross Unrealized (Losses) | (195,580) | (269,167)
TOTAL, Fair Value | 1,274,499 | 1,225,525
TOTAL, Gross Unrealized (Losses) | (195,825) | (270,111)
Total debt securities AFS |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,101,149 | 2,143,333
Gross Unrealized Gains | 148 | 234
Gross Unrealized (Losses) | (250,716) | (339,339)
Fair Value | 1,850,581 | 1,804,228
LESS THAN 12 MONTHS, Fair Value | 129,501 | 92,176
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (1,262) | (3,170)
OVER 12 MONTHS, Fair Value | 1,678,960 | 1,627,990
OVER 12 MONTHS, Gross Unrealized (Losses) | (249,454) | (336,169)
TOTAL, Fair Value | 1,808,461 | 1,720,165
TOTAL, Gross Unrealized (Losses) | $ (250,716) | $ (339,339)

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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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