v3.26.1
PORTFOLIO LOANS - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net deferred loan origination costs $ 5,000,000.0   $ 5,000,000.0   $ 7,000,000.0
Net accretable purchase accounting adjustments     (76,500,000)   (86,600,000)
Portfolio loans, net 13,030,950,000   13,030,950,000   13,393,776,000
Loans purchased   $ 0   $ 0  
Loans sold   0   0  
Amount of interest collected and recognized on a cash basis   $ 0   $ 0  
Commitment to lend 1,300,000   1,300,000   13,500,000
Collateral dependent loans secured by real estate or business assets 57,400,000   57,400,000   47,800,000
Other repossessed assets 2,600,000   2,600,000    
Loans in the process of foreclosure 900,000   900,000    
Bank Overdrafts          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Portfolio loans, net 5,200,000   5,200,000   $ 7,100,000
Retail loans | Retail other          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans purchased 8,700,000   8,700,000    
Commercial loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Limit above which loans are annually reviewed 2,000,000.0   2,000,000.0    
Amount of interest collected and recognized on a cash basis     1,000,000.0    
Other repossessed assets 300,000   300,000    
Commercial loans | Special Mention          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Limit above which loans are quarterly reviewed 350,000   350,000    
Commercial loans | Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Limit where loans are processed through an expedited underwriting process 2,000,000.0   2,000,000.0    
Commercial loans | C&I and other commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans sold 8,700,000   8,700,000    
Amount of interest collected and recognized on a cash basis     600,000    
Commercial loans | CRE and Retail real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Amount of interest collected and recognized on a cash basis 400,000   400,000    
Residential loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Other repossessed assets $ 0   $ 0