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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) segment joint_venture | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($) | Oct. 01, 2019 USD ($) | Oct. 01, 2018 USD ($) | Sep. 30, 2017 USD ($)
NATURE OF BUSINESS AND INDUSTRY SEGMENT INFORMATION [Abstract] |  |  |  |  |  |
Number of reporting segments | segment | 3 | 3 |  |  |  |
CASH AND CASH EQUIVALENTS AND FEDERAL FUNDS SOLD [Abstract] |  |  |  |  |  |
Terms of FHLB advances | 90 days |  |  |  |  |
Reserve balances in cash or on deposit with FRB (Federal Reserve Bank) | $ 0 | $ 33,900,000 |  |  |  |
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% |  |  |  |  |
Federal funds sold | $ 0 |  |  |  |  |
Impairment | 0 | 0 | $ 0 |  |  |
Total stockholders' equity | 847,308,000 | 843,958,000 | 747,726,000 |  |  | $ 434,496,000
Loans outstanding with individuals | 0 | 5,100,000 |  |  |  |
Operating lease, right-of-use asset | 25,800,000 |  |  |  |  |
Operating lease liability | 27,073,000 |  |  |  |  |
SECURITIES [Abstract] |  |  |  |  |  |
Other-than-temporary impairment recorded | 0 | 0 | 0 |  |  |
Equity Investments |  |  |  |  |  |
Impairment loss | 1,300,000 |  |  |  |  |
Net income before noncontrolling interest | 109,344,000 | 101,316,000 | 52,293,000 |  |  |
Transfers |  |  |  |  |  |
Aggregate unpaid balance of loans serviced for others | 232,300,000 | 175,500,000 |  |  |  |
Equity Method Investment, Nonconsolidated Investee |  |  |  |  |  |
Equity Investments |  |  |  |  |  |
Net income before noncontrolling interest | 2,600,000 |  |  |  |  |
FRB |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Interest bearing deposits | 362,000,000.0 |  |  |  |  |
FHLB |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Interest bearing deposits | $ 2,000,000.0 |  |  |  |  |
Minimum |  |  |  |  |  |
Equity Investments |  |  |  |  |  |
Equity method investment, ownership percentage | 5.00% |  |  |  |  |
ALLOWANCE FOR LOAN LOSSES [Abstract] |  |  |  |  |  |
Look back period | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |
Equity Investments |  |  |  |  |  |
Equity method investment, ownership percentage | 25.00% |  |  |  |  |
ALLOWANCE FOR LOAN LOSSES [Abstract] |  |  |  |  |  |
Look back period | 7 years |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  | $ 27,400,000 |  |
Operating lease liability |  |  |  | $ 28,600,000 |  |
Accounting Standards Update 2014-09 | Adjustment |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Total stockholders' equity |  |  | 1,502,000 |  |  |
Other Assets |  |  |  |  |  |
Equity Investments |  |  |  |  |  |
Equity method investments | $ 11,000,000.0 |  |  |  |  |
Other Assets | Accounting Standards Update 2016-01 |  |  |  |  |  |
Equity Investments |  |  |  |  |  |
Alternative Investment | 12,000,000.0 |  |  |  |  |
Fair Value Measured at Net Asset Value Per Share | Other Assets |  |  |  |  |  |
Equity Investments |  |  |  |  |  |
Equity method investments | 2,800,000 |  |  |  |  |
Retained Earnings |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Total stockholders' equity | 234,927,000 | 252,813,000 | 213,048,000 |  |  | $ 167,164,000
Equity Investments |  |  |  |  |  |
Net income before noncontrolling interest | $ 104,720,000 | $ 97,004,000 | 51,620,000 |  |  |
Retained Earnings | Accounting Standards Update 2016-01 | Adjustment |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Total stockholders' equity |  |  | 475,000 |  |  |
Retained Earnings | Accounting Standards Update 2014-09 | Adjustment |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Total stockholders' equity |  |  | $ 1,502,000 |  | $ 1,500,000 |
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 |  |  |  |  |
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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