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SEGMENT REPORTING (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) segment | Jun. 30, 2023 USD ($) | Sep. 30, 2023 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Segment data [Abstract] |  |  |  |  |
Net interest income | $ 110,859 | $ 97,465 | $ 339,196 | $ 282,927 |
Provision for (reversal of) credit loss | 5,881 | 1,773 | 41,823 | 48,312 |
Noninterest income | 65,871 | 67,733 | 247,577 | 260,548 |
Noninterest expense | 123,679 | 114,578 | 383,384 | 346,773 |
Income before income tax expense | 47,170 | 48,847 | 161,566 | 148,390 |
Total assets | 7,530,280 | 7,458,625 | 7,530,280 | 7,458,625 | $ 7,535,543
Total goodwill | 309,505 | 309,505 | 309,505 | 309,505 |
Total deposits | 6,431,516 | 6,306,976 | 6,431,516 | 6,306,976 |
Consumer |  |  |  |  |
Segment data [Abstract] |  |  |  |  |
Net interest income | 57,875 | 40,683 | 173,758 | 116,373 |
Provision for (reversal of) credit loss | (2,187) | 508 | 26,719 | 35,402 |
Noninterest income | 44,235 | 48,714 | 186,709 | 200,029 |
Noninterest expense | 49,133 | 39,666 | 158,598 | 124,070 |
Income before income tax expense | 55,164 | 49,223 | 175,150 | 156,930 |
Total assets | 450,044 | 455,540 | 450,044 | 455,540 |
Total goodwill | 87,145 | 87,145 | 87,145 | 87,145 |
Total deposits | 6,190,419 | 6,130,524 | 6,190,419 | 6,130,524 |
Commercial |  |  |  |  |
Segment data [Abstract] |  |  |  |  |
Net interest income | 52,494 | 53,067 | 143,288 | 142,149 |
Provision for (reversal of) credit loss | 8,013 | 1,265 | 15,031 | 12,860 |
Noninterest income | 18,051 | 16,709 | 51,799 | 45,247 |
Noninterest expense | 33,227 | 33,594 | 106,213 | 105,189 |
Income before income tax expense | 29,305 | 34,917 | 73,843 | 69,347 |
Total assets | 4,321,893 | 3,914,924 | 4,321,893 | 3,914,924 |
Total goodwill | 222,360 | 222,360 | 222,360 | 222,360 |
Total deposits | 13,592 | 7,550 | 13,592 | 7,550 |
Corporate Services/Other |  |  |  |  |
Segment data [Abstract] |  |  |  |  |
Net interest income | 490 | 3,715 | 22,150 | 24,405 |
Provision for (reversal of) credit loss | 55 | 0 | 73 | 50 |
Noninterest income | 3,585 | 2,310 | 9,069 | 15,272 |
Noninterest expense | 41,319 | 41,318 | 118,573 | 117,514 |
Income before income tax expense | (37,299) | (35,293) | (87,427) | (77,887) |
Total assets | 2,758,343 | 3,088,161 | 2,758,343 | 3,088,161 |
Total goodwill | 0 | 0 | 0 | 0 |
Total deposits | $ 227,505 | $ 168,902 | $ 227,505 | $ 168,902 |

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