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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 12 Months Ended
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Sep. 30, 2023 USD ($) segment | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture ownership interest in each of the joint ventures (as a percentage) | 80.00% |  |
Total loans and leases | $ 4,359,681,000 | $ 3,529,280,000 |
Loans held for sale | $ 77,779,000 | 21,071,000 |
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 |  |
Impairment | 0 | 0 | $ 0
SECURITIES |  |  |
Credit loss risk | 0 |  |
Equity Investments |  |  |
Impairment loss | 3,300,000 |  |
Transfers |  |  |
Aggregate unpaid balance of loans serviced for others | 332,500,000 | 336,600,000 |
National Lending | Commercial finance |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total loans and leases | 3,723,158,000 | 3,023,673,000 |
Special Purpose Entity |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | 1,200,000 |  |
Equity Investments |  |  |
Equity method investments | 1,200,000 |  |
Special Purpose Entity | National Lending | Commercial finance |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total loans and leases | 13,700,000 |  |
Loans held for sale | 0 |  |
FRB |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Interest bearing deposits | 260,300,000 |  |
FHLB |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Interest bearing deposits | $ 1,900,000 |  |
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 |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | $ 4,100,000 | 2,900,000 |
Equity Investments |  |  |
Equity method investments | 4,100,000 | 2,900,000 |
Alternative investment | 12,100,000 | 15,300,000 |
Alternative investment, fair value decrease |  | 1,000,000 |
Impairment loss |  | 0 |
Fair Value Measured at Net Asset Value Per Share | Other Assets |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | 8,400,000 | 7,200,000 |
Equity Investments |  |  |
Equity method investments | $ 8,400,000 | $ 7,200,000 |
First Midwest Financial Capital Trust I |  |  |
Schedule of Equity Method Investments [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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