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Commitments and Contingencies (Details) - USD ($)
9 Months Ended
Jul. 27, 2019
Nov. 11, 2018
Sep. 30, 2019
Apr. 30, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]          
Derivatives, index options     $ 106,364,000   $ 14,684,000
Williams v Pantaleoni et al          
Loss Contingencies [Line Items]          
Loss contingency, compensatory damages awarded $ 14,949        
Loss contingency, punitive damages awarded $ 2,920,000        
Loss contingency, damages sought     3,000,000    
New Loans          
Loss Contingencies [Line Items]          
Other commitment     73,800,000    
Existing Loans          
Loss Contingencies [Line Items]          
Other commitment     $ 400,000    
Pending Litigation | National Western Life Insurance Company and National Western Life Group, Inc. v. Ross Rankin Moody et. al [Member]          
Loss Contingencies [Line Items]          
Loss contingency, damages awarded   $ 1,314,054      
Equity index options | Williams v Pantaleoni et al          
Loss Contingencies [Line Items]          
Derivatives, index options       $ 100,000