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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2021 | Sep. 30, 2022 USD ($) joint_venture segment | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Accounting Policies [Abstract] |  |  |  |
Contribution expense to profit sharing plan included in compensation and benefits |  | $ 100,000 | $ 3,100,000 | $ 3,100,000
Employee contributions matched | 100.00% |  |  |
Percent of eligible compensation contributed | 6.00% |  |  |
Investment Holdings [Line Items] |  |  |  |
Number of joint venture LLC's | joint_venture |  | 5 |  |
Joint venture ownership interest in each of the joint ventures (as a percentage) |  | 80.00% |  |
Number of reporting segments | segment |  | 3 |  |
Terms of FHLB advances |  | 90 days |  |
Reserve balances in cash or on deposit with FRB (Federal Reserve Bank) |  | $ 0 | 0 |
Impairment |  | 0 | 0 | 0
Loans outstanding with individuals |  | 0 | 0 |
Allowance for credit losses |  | 45,947,000 | 68,281,000 | 56,188,000
SECURITIES |  |  |  |
Other-than-temporary impairment recorded |  | 0 |  |
Equity Investments |  |  |  |
Impairment loss |  | 0 |  |
Net income before noncontrolling interest |  | 159,354,000 | 145,745,000 | $ 109,344,000
Transfers |  |  |  |
Aggregate unpaid balance of loans serviced for others |  | 336,600,000 | 307,300,000 |
Equity Method Investment, Nonconsolidated Investee |  |  |  |
Equity Investments |  |  |  |
Net income before noncontrolling interest |  | 12,863 |  |
FRB |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Interest bearing deposits |  | 294,400,000 |  |
FHLB |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Interest bearing deposits |  | $ 1,300,000 |  |
Minimum | Other Assets Investments |  |  |  |
Equity Investments |  |  |  |
Equity method investment, ownership percentage |  | 5.00% |  |
Maximum | Other Assets Investments |  |  |  |
Equity Investments |  |  |  |
Equity method investment, ownership percentage |  | 25.00% |  |
Other Assets |  |  |  |
Equity Investments |  |  |  |
Equity method investments |  | $ 2,900,000 | 3,100,000 |
Other Assets | Accounting Standards Update 2016-01 |  |  |  |
Equity Investments |  |  |  |
Impairment loss |  |  | 2,600,000 |
Alternative investment |  | 15,300,000 | 12,900,000 |
Alternative investment, fair value increase (decrease) |  | (1,000,000) | 8,000,000 |
Fair Value Measured at Net Asset Value Per Share | Other Assets |  |  |  |
Equity Investments |  |  |  |
Equity method investments |  | $ 7,200,000 | $ 4,600,000 |
First Midwest Financial Capital Trust I |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Percentage of interest in subsidiary |  | 100.00% |  |
Buildings |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Premises, furniture and equipment, estimated useful lives |  | 39 years |  |
Software Development |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Premises, furniture and equipment, estimated useful lives |  | 3 years |  |
Leasehold Improvements | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Premises, furniture and equipment, estimated useful lives |  | 2 years |  |
Leasehold Improvements | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Premises, furniture and equipment, estimated useful lives |  | 15 years |  |

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