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Loans and Allowance for Credit Losses (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Deferred income $ 28,000   $ 28,000   $ 33,000
Sales-type and Direct Financing Leases, Lease Receivable 396,000   396,000   459,000
Payments to acquire loans held-for-investment     247,412 $ 290,242  
Carrying value of securities pledged 15,600,000   15,600,000   15,800,000
Accrued interest receivable $ 114,000   $ 114,000   $ 120,000
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%   0.92%
Loans past due by 90 days or more $ 163,000   $ 163,000   $ 227,000
Financing receivable, nonaccrual 379,414   379,414   250,114
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 23,482,610   23,482,610   24,074,827
Small business finance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans past due by 90 days or more 35,000   35,000   33,000
Financing receivable, nonaccrual 40,000   40,000   34,300
Single Family | Interest Income          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments to acquire loans held-for-investment 3,200 $ 3,500 8,900 11,400  
1-4 single family residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments to acquire loans held-for-investment 62,000 $ 163,000 247,000 $ 290,000  
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    
Commercial and Industrial Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, nonaccrual 203,486   203,486   125,226
Commercial and Industrial Portfolio Segment [Member] | Small business finance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans past due by 90 days or more 27,000   27,000    
Commercial Real Estate Portfolio Segment [Member] | Small business finance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans past due by 90 days or more 8,000   8,000    
Residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, nonaccrual 23,234   23,234   23,500
Loans in the process of forclosure 108,000   108,000   167,000
US Government Agency Insured Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans in the process of forclosure 98,000   98,000   157,000
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 $ 34,000   $ 34,000   $ 38,000