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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) joint_venture segment | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Oct. 01, 2020 USD ($) | Sep. 30, 2018 USD ($)
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 |  |
Total stockholders' equity | 871,884,000 | 847,308,000 | 843,958,000 |  | $ 747,726,000
Loans outstanding with individuals | 0 | 0 |  |  |
Allowance for credit losses | 68,281,000 | 56,188,000 | 29,149,000 |  | 13,040,000
SECURITIES |  |  |  |  |
Other-than-temporary impairment recorded | 0 |  |  |  |
Equity Investments |  |  |  |  |
Impairment loss | 2,600,000 |  |  |  |
Net income before noncontrolling interest | 145,745,000 | 109,344,000 | 101,316,000 |  |
Transfers |  |  |  |  |
Aggregate unpaid balance of loans serviced for others | 307,300,000 | 232,300,000 |  |  |
Unfunded Loan Commitment |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Allowance for credit losses | 690,000 | 32,000 |  |  |
Equity Method Investment, Nonconsolidated Investee |  |  |  |  |
Equity Investments |  |  |  |  |
Net income before noncontrolling interest | 300,000 |  |  |  |
Adjustment |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Allowance for credit losses |  | 12,773,000 | 0 | $ 12,800,000 | 0
Adjustment | Unfunded Loan Commitment |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Allowance for credit losses |  | 831,000 |  |  |
FRB |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Interest bearing deposits | 184,700,000 |  |  |  |
FHLB |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Interest bearing deposits | $ 2,300,000 |  |  |  |
Minimum |  |  |  |  |
Equity Investments |  |  |  |  |
Equity method investment, ownership percentage | 5.00% |  |  |  |
Maximum |  |  |  |  |
Equity Investments |  |  |  |  |
Equity method investment, ownership percentage | 25.00% |  |  |  |
Other Assets |  |  |  |  |
Equity Investments |  |  |  |  |
Equity method investments | $ 3,100,000 | 11,000,000 |  |  |
Other Assets | Accounting Standards Update 2016-01 |  |  |  |  |
Equity Investments |  |  |  |  |
Impairment loss |  | 1,300,000 |  |  |
Alternative investment | 12,900,000 | 12,000,000 |  |  |
Alternative investment, fair value increase (decrease) | 8,000,000 | 0 |  |  |
Fair Value Measured at Net Asset Value Per Share | Other Assets |  |  |  |  |
Equity Investments |  |  |  |  |
Equity method investments | 4,600,000 | 2,800,000 |  |  |
Retained Earnings |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Total stockholders' equity | 259,189,000 | 234,927,000 | 252,813,000 |  | 213,048,000
Equity Investments |  |  |  |  |
Net income before noncontrolling interest | 141,708,000 | 104,720,000 | 97,004,000 |  |
Retained Earnings | Adjustment |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Total stockholders' equity |  | (8,400,000) |  |  |
Retained Earnings | Accounting Standards Update 2016-01 | Adjustment |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Total stockholders' equity |  |  |  |  | 475,000
Non-controlling interest |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Total stockholders' equity | 1,155,000 | 3,603,000 | 4,047,000 |  | $ 3,574,000
Equity Investments |  |  |  |  |
Net income before noncontrolling interest | $ 4,037,000 | 4,624,000 | $ 4,312,000 |  |
Non-controlling interest | Adjustment |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Total stockholders' equity |  | $ (2,500,000) |  |  |
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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