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General (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Potentially dilutive securities (in shares) 0   55,000    
Common stock dividends (in dollars per share)   $ 0.6275   $ 0.6250  
Deferred policy acquisition cost amortization $ 148,413,000   $ 140,984,000    
Advertising expenses 13,600,000   13,700,000    
Reinsurance policy amount of coverage 205,000,000        
Reinsurance policy, amount retained 10,000,000        
Ceded premiums earned 15,000,000   13,000,000    
Policyholder benefits and claims incurred, ceded (58,000,000)   1,000,000    
Revenue from contract with customer 4,200,000   4,300,000    
Cost of goods and services sold 2,700,000   $ 2,800,000    
Contract with customer, asset 0       $ 0
Contract with customer, liability 0       0
Revenue, remaining performance obligation $ 0       $ 0