v3.26.3
Loans and Allowance for Credit Losses (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 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 379,000   379,000   381,000
Payments to acquire loans held-for-investment     306,367 $ 247,412  
Carrying value of securities pledged 15,800,000   15,800,000   15,600,000
Accrued interest receivable $ 110,000   $ 110,000   $ 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) 0.93%   0.93%   0.91%
Loans past due by 90 days or more $ 200,000   $ 200,000   $ 159,000
Financing receivable, nonaccrual 234,912   234,912   372,618
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 23,593,880   23,593,880   24,053,882
Direct Financing Lease, Lease Income (2,900) $ (3,200) (7,700) (8,900)  
Small business finance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans past due by 90 days or more 30,000   30,000   34,000
Financing receivable, nonaccrual 31,500   31,500   37,900
1-4 single family residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments to acquire loans held-for-investment 167,000 $ 62,000 306,000 $ 247,000  
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 174,632   174,632   238,267
C&I | Small business finance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans past due by 90 days or more 24,000   24,000    
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 23,673   23,673   22,876
Loans in the process of forclosure 112,000   112,000   104,000
Government insured residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans in the process of forclosure 103,000   103,000   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 $ 28,000   $ 28,000   $ 32,000