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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
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Available-for-sale debt securities [Abstract] |  |
Amortized Cost | $ 1,782,201 | $ 1,855,084
Fair Value | 1,782,739 | 1,864,899
Amortized Cost |  |
Due in one year or less | 810 | 810
Due after one year through five years | 13,009 | 13,026
Due after five years through ten years | 76,762 | 50,785
Due after ten years | 713,284 | 773,985
Total | 803,865 | 838,606
Mortgage-backed securities | 978,336 | 1,016,478
Fair Value |  |
Due in one year or less | 814 | 822
Due after one year through five years | 13,245 | 13,378
Due after five years through ten years | 77,893 | 52,357
Due after ten years | 716,407 | 781,313
Total | 808,359 | 847,870
Mortgage-backed securities | 974,380 | 1,017,029
Corporate securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 25,000 | 25,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | 0 | 0
Fair Value | 25,000 | 25,000
SBA securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 146,639 | 151,958
Gross Unrealized Gains | 4,200 | 5,251
Gross Unrealized (Losses) | 0 | 0
Fair Value | 150,839 | 157,209
Obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,793 | 2,497
Gross Unrealized Gains | 6 | 10
Gross Unrealized (Losses) | 0 | 0
Fair Value | 2,799 | 2,507
Non-bank qualified obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 250,241 | 266,048
Gross Unrealized Gains | 2,056 | 3,347
Gross Unrealized (Losses) | (1,425) | (1,100)
Fair Value | 250,872 | 268,295
LESS THAN 12 MONTHS, Fair Value | 110,535 | 101,046
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (1,425) | (1,100)
OVER 12 MONTHS, Fair Value | 0 | 0
OVER 12 MONTHS, Gross Unrealized (Losses) | 0 | 0
TOTAL, Fair Value | 110,535 | 101,046
TOTAL, Gross Unrealized (Losses) | (1,425) | (1,100)
Asset-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 379,192 | 393,103
Gross Unrealized Gains | 2,331 | 3,003
Gross Unrealized (Losses) | (2,674) | (1,247)
Fair Value | 378,849 | 394,859
LESS THAN 12 MONTHS, Fair Value | 198,807 | 127,110
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (2,376) | (283)
OVER 12 MONTHS, Fair Value | 46,215 | 91,553
OVER 12 MONTHS, Gross Unrealized (Losses) | (298) | (964)
TOTAL, Fair Value | 245,022 | 218,663
TOTAL, Gross Unrealized (Losses) | (2,674) | (1,247)
Mortgage-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 978,336 | 1,016,478
Gross Unrealized Gains | 6,962 | 9,728
Gross Unrealized (Losses) | (10,918) | (9,177)
Fair Value | 974,380 | 1,017,029
LESS THAN 12 MONTHS, Fair Value | 702,224 | 759,035
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (8,427) | (7,418)
OVER 12 MONTHS, Fair Value | 90,298 | 60,792
OVER 12 MONTHS, Gross Unrealized (Losses) | (2,491) | (1,759)
TOTAL, Fair Value | 792,522 | 819,827
TOTAL, Gross Unrealized (Losses) | (10,918) | (9,177)
Total debt securities AFS |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,782,201 | 1,855,084
Gross Unrealized Gains | 15,555 | 21,339
Gross Unrealized (Losses) | (15,017) | (11,524)
Fair Value | 1,782,739 | 1,864,899
LESS THAN 12 MONTHS, Fair Value | 1,011,566 | 987,191
LESS THAN 12 MONTHS, Gross Unrealized (Losses) | (12,228) | (8,801)
OVER 12 MONTHS, Fair Value | 136,513 | 152,345
OVER 12 MONTHS, Gross Unrealized (Losses) | (2,789) | (2,723)
TOTAL, Fair Value | 1,148,079 | 1,139,536
TOTAL, Gross Unrealized (Losses) | $ (15,017) | $ (11,524)

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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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