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Loans Receivable and Allowance for Credit Losses (Narrative) (Details)
 9 Months Ended
Sep. 30, 2025
USD ($)
loan
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable $ 2,828,933,000 $ 3,125,647,000 $ 3,322,139,000 $ 3,033,784,000
Financing receivable, nonaccrual, interest income 4,400,000 2,200,000 1,500,000  
Loans returned to accrual, interest income 2,100,000 1,100,000 2,400,000  
Amortized cost of loans past due 90 days and still accruing 280,000     7,726,000
Business Express [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable 78,253,000 98,957,000 101,258,000 92,947,000
Subsequent default, amount $ 1,300,000      
Subsequent default, number | loan 8      
Amortized cost of loans past due 90 days and still accruing $ 244,000     1,677,000
Business Express [Member] | Maximum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable 250,000      
Commercial Business [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable 192,762,000 $ 264,745,000 $ 261,135,000 $ 242,239,000
Subsequent default, amount 1,500,000      
Subsequent default amount charged off $ 1,000,000.0      
Subsequent default, number | loan 2