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OUTSTANDING COMMITMENTS AND CONTINGENT LIABILITIES (Details)
$ in Thousands
Jul. 02, 2025
USD ($)
Dec. 31, 2025
USD ($)
Nov. 25, 2025
lawsuit
Dec. 31, 2024
USD ($)
Credit Commitments and Contingencies        
Total commitments   $ 4,820,613   $ 2,548,178
Income tax examination, number of lawsuits filed | lawsuit     2  
Federal        
Credit Commitments and Contingencies        
Income tax examination, number of lawsuits filed | lawsuit     1  
Illinois        
Credit Commitments and Contingencies        
Income tax examination, number of lawsuits filed | lawsuit     1  
Minimum        
Credit Commitments and Contingencies        
Estimated amount due $ 28,000      
Estimated amount due, interest 17,400      
Estimated amount due, penalties (approximately) $ 300      
Commitments to extend credit        
Credit Commitments and Contingencies        
Total commitments   4,696,867   2,512,714
Standby letters of credit        
Credit Commitments and Contingencies        
Total commitments   $ 123,746   $ 35,464