v3.26.1
LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
portfolio
segment
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
portfolio
segment
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loan participations $ 3,700,000,000   $ 3,700,000,000    
Loan participations sold 1,800,000,000   1,800,000,000    
Loan participations retained $ 1,900,000,000   $ 1,900,000,000    
Number of loan portfolios | portfolio 4   4    
Number of loan segments | segment 7   7    
Provision for credit losses $ 36,206,000 $ 106,835,000 $ 71,152,000 $ 138,238,000  
Accrued interest receivable on loans 223,700,000   $ 223,700,000   $ 228,600,000
Loan placed on nonaccrual when past due, number of days     90 days    
Payment defaults 12,100,000 4,600,000 $ 18,500,000 9,100,000  
Unfunded commitments on TDRs $ 0   $ 0   $ 0
Bremer          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Provision for credit losses   $ 69,100,000   $ 69,100,000  
Commercial real estate          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Percentage of risk-based capital 254.00%   254.00%    
Regulatory guideline limit 300.00%   300.00%