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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2024 USD ($) segment | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2023 USD ($)
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 |  |  |  |  |  |  |  |  | $ 4,071,071,000 | $ 4,363,391,000 |  |
Loans held for sale | $ 17,148,000 | $ 36,182,000 | $ 25,946,000 | $ 24,780,000 | $ 31,410,000 | $ 29,380,000 | $ 87,351,000 | $ 67,571,000 | $ 691,688,000 | 77,779,000 | $ 21,071,000 | $ 69,518,000
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 |  |  |  |  |  |  |  |  | 1,000,000.0 | 3,300,000 |  |
Impairment on rental equipment | $ 24,000 | $ 0 | $ 2,013,000 | $ 2,774,000 | $ 0 | $ 2,013,000 | $ 24,000 | $ 0 | 2,013,000 | 24,000 | $ 0 |
Transfers |  |  |  |  |  |  |  |  |  |  |  |
Aggregate unpaid balance of loans serviced for others |  |  |  |  |  |  |  |  | 364,500,000 | 332,500,000 |  |
National Lending | Commercial finance |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total loans and leases |  |  |  |  |  |  |  |  | 3,295,599,000 | 3,726,868,000 |  |
National Lending | Consumer finance |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total loans and leases |  |  |  |  |  |  |  |  | 248,800,000 | 254,416,000 |  |
National Lending | Consumer finance | Consumer Loan Programs |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total loans and leases |  |  |  |  |  |  |  |  | 273,000,000.0 | $ 332,200,000 |  |
Loans held for sale |  |  |  |  |  |  |  |  | $ 24,200,000 |  |  |
Percentage of total gross loan portfolio |  |  |  |  |  |  |  |  | 6.00% | 8.00% |  |
Loans held for investment |  |  |  |  |  |  |  |  | $ 248,800,000 | $ 254,400,000 |  |
Special Purpose Entity |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  | 5,800,000 | 1,200,000 |  |
Equity Investments |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  | 5,800,000 | 1,200,000 |  |
Special Purpose Entity | National Lending | Commercial finance |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total loans and leases |  |  |  |  |  |  |  |  | 18,400,000 | 13,700,000 |  |
Loans held for sale |  |  |  |  |  |  |  |  | 4,600,000 | 0 |  |
FRB |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest bearing deposits |  |  |  |  |  |  |  |  | 104,900,000 |  |  |
FHLB |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest bearing deposits |  |  |  |  |  |  |  |  | 1,700,000 |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  | 4,100,000 | 4,100,000 |  |
Equity Investments |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  | 4,100,000 | 4,100,000 |  |
Alternative investment |  |  |  |  |  |  |  |  | $ 9,500,000 | 12,100,000 |  |
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% |  |  |
Fair Value Measured at Net Asset Value Per Share | Other Assets |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  | $ 11,800,000 | 8,400,000 |  |
Equity Investments |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  | $ 11,800,000 | $ 8,400,000 |  |
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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