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Summary Of Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
portfolio_segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Number of Portfolio Segments | portfolio_segment 2    
Number of Reportable Segments | portfolio_segment 1    
Monthly fee charged Dealer in Portfolio Program $ 599    
Threshold to determine likelihood of being sustained 50.00%    
Employer matching contribution, match percentage 100.00%    
Matching contribution 4.00%    
Employer matching contribution, additional match percentage 50.00%    
Additional matching contribution 2.00%    
Maximum matching contribution 5.00%    
Recognized compensation expense $ 7,200,000 $ 7,100,000 $ 5,300,000
Advertising expense 100,000 300,000 $ 200,000
Adoption of CECL [1] 0    
Cash and Cash Equivalents [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Uninsured cash and cash equivalents 15,700,000 186,100,000  
Restricted Cash And Cash Equivalents [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Uninsured cash and cash equivalents $ 376,900,000 $ 326,700,000  
Building [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful lives 40 years    
Building Improvements [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful lives 10 years    
Data Processing Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful lives 3 years    
Software [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful lives 5 years    
Office Furniture And Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful lives 7 years    
Leasehold Improvements [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful lives 7 years    
Software Development [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful lives five years    
Annual Incremental Provision for Credit Losses on New Loans [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Adoption of CECL $ 518,600,000    
Annual Net Income Impact [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Adoption of CECL 399,300,000    
Annual Net Income Per Share Impact [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Adoption of CECL 22.26    
Loans Receivable and related Allowance for Credit Losses [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Adoption of CECL 2,463,600,000    
Allowance for Credit Losses [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Adoption of CECL [1] $ 2,463,600,000    
[1] Represents the gross-up of Loans receivable and allowance for credit losses on January 1, 2020 upon the adoption of CECL for the present value of the difference between contractual future net cash flows and expected future net cash flows discounted at the effective interest rate.