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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
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Available-for-sale debt securities [Abstract] |  |
Amortized Cost | $ 1,897,889 | $ 1,244,384
Fair Value | 1,917,605 | 1,268,102
Amortized Cost |  |
Due in one year or less | 245 | 1,385
Due after one year through five years | 17,884 | 20,805
Due after five years through ten years | 53,273 | 32,441
Due after ten years | 767,166 | 749,874
Total | 838,568 | 804,505
Mortgage-backed securities | 1,059,321 | 439,879
Fair Value |  |
Due in one year or less | 245 | 1,398
Due after one year through five years | 18,467 | 21,769
Due after five years through ten years | 55,337 | 34,025
Due after ten years | 779,974 | 757,303
Total | 854,023 | 814,495
Mortgage-backed securities | 1,063,582 | 453,607
SBA securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 162,922 | 159,722
Gross Unrealized Gains | 6,263 | 5,391
Gross Unrealized (Losses) | 0 | (158)
Fair Value | 169,185 | 164,955
LESS THAN 12 MONTHS, Fair Value |  | 32,257
LESS THAN 12 MONTHS, Gross Unrealized (Losses) |  | (102)
OVER 12 MONTHS, Fair Value |  | 9,875
OVER 12 MONTHS, Gross Unrealized (Losses) |  | (56)
TOTAL, Fair Value |  | 42,132
TOTAL, Gross Unrealized (Losses) |  | (158)
Obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,758 | 825
Gross Unrealized Gains | 8 | 16
Gross Unrealized (Losses) | 0 | 0
Fair Value | 2,766 | 841
Non-bank qualified obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 267,031 | 314,819
Gross Unrealized Gains | 7,423 | 8,978
Gross Unrealized (Losses) | (104) | (23)
Fair Value | 274,350 | 323,774
LESS THAN 12 MONTHS, Fair Value | 24,357 | 6,265
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (104) | (6)
OVER 12 MONTHS, Fair Value | 0 | 3,103
OVER 12 MONTHS, Gross Unrealized (Losses) | 0 | (17)
TOTAL, Fair Value | 24,357 | 9,368
TOTAL, Gross Unrealized (Losses) | (104) | (23)
Asset-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 405,857 | 329,139
Gross Unrealized Gains | 2,760 | 2,015
Gross Unrealized (Losses) | (895) | (6,229)
Fair Value | 407,722 | 324,925
LESS THAN 12 MONTHS, Fair Value | 124,158 | 106,474
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (234) | (1,089)
OVER 12 MONTHS, Fair Value | 94,726 | 178,686
OVER 12 MONTHS, Gross Unrealized (Losses) | (661) | (5,140)
TOTAL, Fair Value | 218,884 | 285,160
TOTAL, Gross Unrealized (Losses) | (895) | (6,229)
Mortgage-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,059,321 | 439,879
Gross Unrealized Gains | 9,866 | 14,567
Gross Unrealized (Losses) | (5,605) | (839)
Fair Value | 1,063,582 | 453,607
LESS THAN 12 MONTHS, Fair Value | 695,230 | 138,338
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (4,207) | (839)
OVER 12 MONTHS, Fair Value | 55,415 | 0
OVER 12 MONTHS, Gross Unrealized (Losses) | (1,398) | 0
TOTAL, Fair Value | 750,645 | 138,338
TOTAL, Gross Unrealized (Losses) | (5,605) | (839)
Total debt securities AFS |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,897,889 | 1,244,384
Gross Unrealized Gains | 26,320 | 30,967
Gross Unrealized (Losses) | (6,604) | (7,249)
Fair Value | 1,917,605 | 1,268,102
LESS THAN 12 MONTHS, Fair Value | 843,745 | 283,334
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (4,545) | (2,036)
OVER 12 MONTHS, Fair Value | 150,141 | 191,664
OVER 12 MONTHS, Gross Unrealized (Losses) | (2,059) | (5,213)
TOTAL, Fair Value | 993,886 | 474,998
TOTAL, Gross Unrealized (Losses) | $ (6,604) | $ (7,249)

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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