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Fair Value Measurements (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 30, 2014
USD ($)
loan
Mar. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount   $ 0  
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net   0  
Cash and cash equivalents   119,600 $ 944,500
Collateral dependent loans   22,000  
Specific reserves and other write downs on impaired loans   $ 3,000  
Number of troubled debt restructured loans | loan   12  
Troubled debt restructured loans balance   $ 17,400 $ 2,084
Troubled debt restructured loans, specific reserve   $ 1,000  
Minimum [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Estimated Selling Costs   7.00%  
Maximum [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Estimated Selling Costs   10.00%  
Walnut Street [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans, face value $ 267,600    
Proceeds from Sale of Loans Receivable 209,600    
Notes Payable $ 193,600    
Number of notes | loan 2    
Walnut Street [Member] | Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior Notes $ 178,200    
Debt Instrument, Interest Rate, Stated Percentage 1.50%    
Walnut Street [Member] | Junior Subordinated Debt [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Junior Subordinated Notes $ 15,400    
Debt Instrument, Interest Rate, Stated Percentage 10.00%