v3.26.1
Loans and Allowance for Credit Losses - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
loan
Jun. 30, 2026
USD ($)
loan
Jun. 30, 2025
USD ($)
loan
Dec. 31, 2025
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 18,062,369,000   $ 18,062,369,000   $ 17,492,179,000
Loan premiums and discounts     1,700,000   3,300,000
Deferred origination costs and fees 3,800,000   3,800,000   5,400,000
Financing receivable, accrued interest excluded from amortized costs 81,400,000   81,400,000   80,300,000
Nonaccrual loans with no allowance for credit loss 23,300,000   23,300,000   18,000,000.0
Financing receivable, collateral dependent, amount 106,757,000   106,757,000   112,374,000
Provision for credit loss expense 17,434,000 $ 11,945,000 32,056,000 $ 38,742,000  
Unfunded Loan Commitment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unfunded commitments, allowance for credit loss 25,600,000   25,600,000   25,600,000
Reserve for unfunded commitments, expensed (released) 0 0 0 $ 0  
Residential Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans in process of foreclosure, amount 3,900,000   $ 3,900,000   4,400,000
Commercial Loan          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of loans experiencing financial difficulty, modified, subsequent default | loan     0 1  
Loan modified and subsequently defaulted       $ 26,700,000  
OREO Received in Full or Partial Satisfaction of Loans | Residential Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Foreclosed assets and other real estate owned 3,100,000   $ 3,100,000   $ 3,600,000
Loans, Excluding Acquired Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit loss expense $ 17,434,000 11,945,000 $ 32,056,000 38,742,000  
Loans, Excluding Acquired Loans | Nonperforming          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for credit loss expense   $ 15,600,000   $ 15,600,000  
Number of credit relationships migrated to nonperforming | loan   2   2  
Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, term of loan     1 year    
Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, term of loan     3 years