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v3.25.2

SHORT-TERM AND LONG-TERM BORROWINGS - Long Term Debt Narrative (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 USD ($) Period $ / shares shares | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Debt Instrument [Line Items] |  |  |
Proceeds from long-term borrowings | $ 0 | $ 0 | $ 20,000
Subordinated debentures, net of issuance costs | 19,693 | $ 19,591 |
6 Point 625 Percent Fixed to Floating Rate Subordinated Debt, Due 2032 | Subordinated debentures |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from long-term borrowings | $ 20,000 |  |
Interest rate, stated percentage | 6.625% |  |
5.75% Fixed to Floating Rate Subordinated Debt, Due August 15, 2026 | Subordinated debentures |  |  |
Debt Instrument [Line Items] |  |  |
Subordinated debentures, net of issuance costs | $ 19,700 |  |
Crestmark Bancorp, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Effective interest rate | 7.85% |  |
Long-term borrowings | $ 3,400 |  |
Debt instrument, term | 30 years |  |
Interest payment deferment period | 5 years |  |
Tenor Spread Adjustment | Crestmark Bancorp, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.26161% |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Crestmark Bancorp, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 3.00% |  |
First Midwest Financial Capital Trust I |  |  |
Debt Instrument [Line Items] |  |  |
Issuance of trust preferred securities (in shares) | shares | 10,000 |  |
Number of authorized shares of trust preferred securities issued (in shares) | shares | 10,310 |  |
Number of consecutive semi-annual periods that interest payments on capital securities may be deferred | Period | 10 |  |
Redemption price per capital security (in dollars per share) | $ / shares | $ 1,000 |  |
First Midwest Financial Capital Trust I | Tenor Spread Adjustment |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.42826% |  |
First Midwest Financial Capital Trust I | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 3.75% |  |
Effective interest rate | 8.43% | 9.65% |
First Midwest Financial Capital Trust I | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Effective interest rate | 12.50% |  |
First Midwest Financial Capital Trust I | First Midwest Financial Capital Trust I |  |  |
Debt Instrument [Line Items] |  |  |
Equity method investment, ownership percentage | 100.00% |  |

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