v3.26.1
Loans and Allowance for Credit Losses (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 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]          
Deferred income $ 21,000   $ 21,000   $ 22,000
Sales-type and Direct Financing Leases, Lease Receivable 405,000   405,000   381,000
Payments to acquire loans held-for-investment     139,181 $ 185,043  
Carrying value of securities pledged 15,400,000   15,400,000   15,600,000
Accrued interest receivable $ 111,000   $ 111,000   $ 113,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other assets   Other assets    
Allowance for credit losses to total loans (in percent) 0.91%   0.91%   0.91%
Loans past due by 90 days or more $ 176,000   $ 176,000   $ 159,000
Financing receivable, nonaccrual 223,924   223,924   372,618
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 23,711,557   23,711,557   24,053,882
Direct Financing Lease, Lease Income (2,500) $ (2,900) (4,900) (5,700)  
Small business finance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans past due by 90 days or more 31,000   31,000   34,000
Financing receivable, nonaccrual 31,800   31,800   37,900
1-4 single family residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments to acquire loans held-for-investment 82,000 $ 89,000 139,000 $ 185,000  
Commercial | Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable credit quality indicator, the value at which relationships are reevaluated at least annually 3,000   3,000    
C&I          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, nonaccrual 160,599   160,599   238,267
C&I | Small business finance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans past due by 90 days or more 25,000   25,000    
CRE | Small business finance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans past due by 90 days or more 6,000   6,000    
Residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, nonaccrual 26,034   26,034   22,876
Loans in the process of forclosure 117,000   117,000   104,000
US Government Agency Insured Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans in the process of forclosure 107,000   107,000   96,000
Financial Asset Acquired with Credit Deterioration [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss $ 29,000   $ 29,000   $ 32,000