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SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands |  |  |  |  |  | 2 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 20, 2021 | Nov. 19, 2021 | Oct. 19, 2021 | Oct. 13, 2021 | Oct. 01, 2021 | Nov. 18, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  |  | 101,481 | 103,830 |
Loans and leases to held for sale |  |  |  |  |  |  | $ 188,638 | $ 542,101 | $ 99,992
Proceeds from held-for-sale loans |  |  |  |  |  |  | 890,300 | 590,800 |
Allowance for credit losses released |  |  |  |  |  |  | 57,273 | 41,761 | $ 42,854
Community Banking |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses released |  |  |  |  |  |  | $ 144 | $ 0 |
Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Percent of eligible compensation contributed | 6.00% | 4.00% |  |  | 6.00% |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  | 1,252,145 |  |  |
Subsequent Event | Community Banking |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Loans and leases to held for sale |  |  | $ 170,000 |  |  |  |  |  |
Proceeds from held-for-sale loans |  |  |  | $ 30,200 |  |  |  |  |
Allowance for credit losses released |  |  |  | $ 1,000 |  |  |  |  |

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