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CAPITAL REQUIREMENTS - Actual and Required Capital Amounts and Ratios (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Capital requirements and restrictions on dividends |  |
Total Capital (to Risk Weighted Assets): Actual Amount | $ 833,709 | $ 866,878
Total Capital (to Risk Weighted Assets): Actual Ratio | 0.1307 | 0.1237
Total Capital (to Risk Weighted Assets): Minimum Required For Adequate Capital Purposes Amount | $ 669,998 | $ 735,539
Total Capital (to Risk Weighted Assets): Minimum Required For Adequate Capital Purposes Ratio | 0.1050 | 0.1050
Tier I Capital (to Risk Weighted Assets): Actual Amount | $ 685,934 | $ 685,767
Tier I Capital (to Risk Weighted Assets): Actual Ratio | 0.1075 | 0.0979
Tier I Capital (to Risk Weighted Assets): Minimum Required For Adequate Capital Purposes Amount | $ 542,379 | $ 595,437
Tier I Capital (to Risk Weighted Assets): Minimum Required For Adequate Capital Purposes Ratio | 0.0850 | 0.0850
Common Equity Tier 1 capital (to risk-weighted assets): Actual Amount | $ 510,435 | $ 510,269
Common Equity Tier 1 capital (to risk-weighted assets): Actual Ratio | 8.00% | 7.28%
Common Equity Tier 1 capital (to risk-weighted assets): Minimum Required for adequate capital Amount | $ 446,665 | $ 490,360
Common equity tier 1 capital (to risk-weighted assets): minimum required for adequate capital ratio | 7.00% | 7.00%
Tier I Capital (to Average Assets): Actual Amount | $ 685,934 | $ 685,767
Tier I Capital (to Average Assets): Actual Ratio | 0.0903 | 0.0873
Tier I Capital (to Average Assets): Minimum Required For Adequate Capital Purposes Amount | $ 255,237 | $ 280,206
Tier I Capital (to Average Assets): Minimum Required For Adequate Capital Purposes Ratio | 0.0400 | 0.0400
Midland States Bank |  |
Capital requirements and restrictions on dividends |  |
Total Capital (to Risk Weighted Assets): Actual Amount | $ 792,327 | $ 809,596
Total Capital (to Risk Weighted Assets): Actual Ratio | 0.1243 | 0.1157
Total Capital (to Risk Weighted Assets): Minimum Required For Adequate Capital Purposes Amount | $ 669,052 | $ 734,781
Total Capital (to Risk Weighted Assets): Minimum Required For Adequate Capital Purposes Ratio | 0.1050 | 0.1050
Total Capital (to Risk Weighted Assets): Required to be Well Capitalized Amount Under Prompt Corrective Action Requirements Amount | $ 637,192 | $ 699,791
Total Capital (to Risk Weighted Assets): Required to be Well Capitalized Ratio Under Prompt Corrective Action Requirements Ratio | 0.1000 | 0.1000
Tier I Capital (to Risk Weighted Assets): Actual Amount | $ 712,263 | $ 722,122
Tier I Capital (to Risk Weighted Assets): Actual Ratio | 0.1118 | 0.1032
Tier I Capital (to Risk Weighted Assets): Minimum Required For Adequate Capital Purposes Amount | $ 541,614 | $ 594,823
Tier I Capital (to Risk Weighted Assets): Minimum Required For Adequate Capital Purposes Ratio | 0.0850 | 0.0850
Tier I Capital (to Risk Weighted Assets): Required to be Well Capitalized Amount Under Prompt Corrective Action Requirements Amount | $ 509,754 | $ 559,833
Tier I Capital (to Risk Weighted Assets): Required to be Well Capitalized Ratio Under Prompt Corrective Action Requirements Ratio | 0.0800 | 0.0800
Common Equity Tier 1 capital (to risk-weighted assets): Actual Amount | $ 712,263 | $ 722,122
Common Equity Tier 1 capital (to risk-weighted assets): Actual Ratio | 11.18% | 10.32%
Common Equity Tier 1 capital (to risk-weighted assets): Minimum Required for adequate capital Amount | $ 446,035 | $ 489,854
Common equity tier 1 capital (to risk-weighted assets): minimum required for adequate capital ratio | 7.00% | 7.00%
Common Equity Tier 1 capital (to risk-weighted assets): Required to be Well Capitalized Amount Under Prompt Corrective Action Requirements Amount | $ 414,175 | $ 454,864
Common Equity Tier 1 capital (to risk-weighted assets): Required to be Well Capitalized Ratio Under Prompt Corrective Action Requirements Ratio | 6.50% | 6.50%
Tier I Capital (to Average Assets): Actual Amount | $ 712,263 | $ 722,122
Tier I Capital (to Average Assets): Actual Ratio | 0.0938 | 0.0920
Tier I Capital (to Average Assets): Minimum Required For Adequate Capital Purposes Amount | $ 254,877 | $ 279,917
Tier I Capital (to Average Assets): Minimum Required For Adequate Capital Purposes Ratio | 0.0400 | 0.0400
Tier I Capital (to Average Assets): Required to be Well Capitalized Amount Under Prompt Corrective Action Requirements Amount | $ 318,596 | $ 349,896
Tier I Capital (to Average Assets): Required to be Well Capitalized Ratio Under Prompt Corrective Action Requirements Ratio | 0.0500 | 0.0500

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