v3.26.1
Loans - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium) $ 800   $ 200    
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available 6,100,000     $ 6,300,000  
Proceeds from sale of SBA loans 25,400 $ 31,300      
Gain on sale of SBA loans 1,414 1,895      
Financing receivable, allowance for credit loss 142,064     140,022  
Allowance for credit loss adjustment 39,900        
Nonperforming loan balances, excluding government guaranteed balances 28,200     28,900  
Loans, including unearned loan fees 11,550,716     11,660,316  
Financing Receivable, Consumer Mortgage Loan Secured By Residential Real Estate In Process Of Foreclosure, Amount 200     200  
Other Assets          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable 60,700     58,300  
Enterprise Value Lending Portfolio Niche Segment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for credit loss adjustment 21,400        
Non-Covered Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, allowance for credit loss 142,064 142,944   140,022 $ 137,950
Loans, including unearned loan fees 11,692,780     11,800,338  
Non-Covered Loans | C&I          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, allowance for credit loss 73,110 $ 69,887   68,345 $ 63,231
Loans, including unearned loan fees 5,172,817     $ 5,236,473  
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, allowance for credit loss $ 8,800        
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans | Baseline          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Growth upside forecast 0.40        
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans | Near-term growth upside          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Growth upside forecast 0.30        
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans | Moderate recession downside          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Growth upside forecast 0.30