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Loans and Allowance for Credit Losses (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Deferred income $ 30,000   $ 30,000   $ 33,000
Sales-type and Direct Financing Leases, Lease Receivable 436,000   436,000   459,000
Payments to acquire loans held-for-investment     185,043 $ 126,983  
Carrying value of securities pledged 15,500,000   15,500,000   15,800,000
Accrued interest receivable $ 117,000   $ 117,000   $ 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 $ 194,000   $ 194,000   $ 227,000
Financing receivable, nonaccrual 375,748   375,748   250,114
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 23,710,797   23,710,797   24,074,827
Small business finance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans past due by 90 days or more 34,000   34,000   33,000
Financing receivable, nonaccrual 35,900   35,900   34,300
Single Family | Interest Income          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments to acquire loans held-for-investment 2,900 $ 3,800 5,700 7,900  
1-4 single family residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payments to acquire loans held-for-investment 89,000 $ 60,000 185,000 $ 127,000  
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 195,897   195,897   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 25,000   25,000    
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 9,000   9,000    
Residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, nonaccrual 23,151   23,151   23,500
Loans in the process of forclosure 71,000   71,000   167,000
US Government Agency Insured Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans in the process of forclosure 63,000   63,000   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 $ 35,000   $ 35,000   $ 38,000