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Loans Receivable and Allowance for Credit Losses (Narrative) (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable $ 3,125,647,000 $ 3,317,402,000 $ 3,322,139,000
Financing Receivable, Nonaccrual, Interest Income 5,000,000.0 1,900,000  
Loans returned to accrual, interest income 1,100,000 314,000  
Amortized Cost Of Loans Past Due 90 Days And Still Accruing 6,220,000 0  
Business Express [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable 98,957,000 $ 102,928,000 $ 101,258,000
Amortized Cost Of Loans Past Due 90 Days And Still Accruing 387,000    
Business Express [Member] | Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable $ 250,000