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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (Line of Credit and Term Loan Narrative) (Details) - September 30, 2016 Credit Agreement
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
occasions
guarantor
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Sep. 30, 2016
USD ($)
banks
Debt Instrument [Line Items]        
Credit agreement, number of banks in the agreement | banks       6
Credit agreement, interest rate, floating, applicable margin 0.75%      
Credit agreement, interest rate, floating, adjusted LIBOR 1.75%      
Minimum risk-based capital ratio 275.00%      
Maximum debt to capital ratio 0.35      
Minimum capital to be retained 80.00%      
Minimum portion of net income to be retained 50.00%      
Minimum capital contributions to be retained 50.00%      
Cash in excess of amount required by covenants $ 984,600      
2016 Line of Credit        
Debt Instrument [Line Items]        
Line of credit, maximum borrowing capacity       $ 150,000
Line of credit, unused capacity, commitment fee percentage 0.275%      
Line of credit, number of occasions borrowing capacity can be increased | occasions 3      
Line of credit, additional borrowing capacity, aggregate amount $ 50,000      
Line of credit, duration of maturity date extension available, years 1 year      
Credit agreement, number of guarantors | guarantor 0      
Line of credit, amount outstanding $ 0 $ 0    
Term Loan        
Debt Instrument [Line Items]        
Term loan       $ 100,000
Interest rate, effective percentage     3.125%