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FHLB ADVANCES AND OTHER BORROWINGS - Summary of FHLB Advances (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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FHLB ADVANCES AND OTHER BORROWINGS |  |
Total FHLB advances and other borrowings | $ 373,000 | $ 258,000
FHLB advances, collateral for mortgage and home equity line of credit loans | 2,880,000 | 3,230,000
Line of credit facility, maximum borrowing capacity | 1,050,000 |
Midland States Bank | Fixed rate fixed term maturing October 2029 |  |
FHLB ADVANCES AND OTHER BORROWINGS |  |
Total FHLB advances and other borrowings | $ 188,000 | $ 133,000
Interest rate | 4.38% | 4.50%
Midland States Bank | Putable fixed rate maturing July 2034 |  |
FHLB ADVANCES AND OTHER BORROWINGS |  |
Total FHLB advances and other borrowings | $ 125,000 | $ 125,000
Interest rate | 3.69% | 3.69%
Midland States Bank | Short term fixed rate matured December 2024 |  |
FHLB ADVANCES AND OTHER BORROWINGS |  |
Total FHLB advances and other borrowings | $ 60,000 | $ 0
Interest rate | 4.20% |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478878/942-470-45-1 + Details
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- Definition Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(3)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478878/942-470-45-1 + Details
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- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478878/942-470-45-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 + Details
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- Definition States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478878/942-470-45-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 + Details
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