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Short-Term Debt and Long-term Debt (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Financing receivables $ 3,279,708,000 $ 3,045,331,000  
Securities pledged as collateral 0 0  
Net Of Unamortized Prepayment Penalties $ 988,000    
Unamortized prepayment penalties   1,500,000 $ 2,100,000
Maximum ratio of debt to total assets under debt covenant 50.00%    
Maximum total debt under debt covenant $ 1,916,000,000    
Asset Pledged as Collateral [Member]      
Debt Instrument [Line Items]      
Financing receivables 1,700,000,000 $ 1,200,000,000  
FHLB Advances Due In 2021 Through 2024 [Member]      
Debt Instrument [Line Items]      
Debt extinguished $ 115,000,000.0    
Weighted average interest rate 1.60%    
Increase (decrease) in weighted average interest rate (0.16%)