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Business Combinations (Details) - USD ($)
6 Months Ended
Jan. 31, 2019
Jun. 30, 2019
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]            
Contingent consideration on businesses acquired       $ 4,200,000    
Value of business acquired     $ 134,270,000   $ 138,071,000 $ 0
Ozark National Life Insurance Company and NIS            
Business Acquisition [Line Items]            
Payments to acquire business $ 205,400,000          
Acquisition-related costs   $ 3,300,000        
Revenues of acquiree since acquisition date   48,400,000        
Net earnings of acquiree since acquisition date   $ 7,200,000        
Ozark National Life Insurance Company            
Business Acquisition [Line Items]            
Earn-out payment maximum 5,000,000.0          
Contingent consideration on businesses acquired 3,700,000       $ 4,100,000  
Value of business acquired $ 145,800,000