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Liabilities for Unpaid Losses, Claims and Loss Adjustment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Liabilities for Unpaid Losses, Claims and Loss Adjustment Expenses [Roll Forward]    
Beginning liabilities for unpaid losses, claims and loss adjustment expenses, gross $ 65,689  
Paid related to [Abstract]    
Ending liabilities for unpaid losses, claims and loss adjustment expenses, gross 70,120  
Reconciliation of total incurred claims to total insurance benefits and losses incurred [Abstract]    
Total incurred losses 32,367 $ 28,740
Cash surrender value and matured endowments 378 483
Benefit reserve changes 427 774
Insurance benefits and losses incurred 33,172 29,997
Property and Casualty Insurance Products [Member]    
Liabilities for Unpaid Losses, Claims and Loss Adjustment Expenses [Roll Forward]    
Beginning liabilities for unpaid losses, claims and loss adjustment expenses, gross 47,997 49,556
Less: Reinsurance recoverable on unpaid losses (7,220) (9,806)
Beginning liabilities for unpaid losses, claims and loss adjustment expenses, net 40,777 39,750
Incurred related to [Abstract]    
Current accident year 9,602 8,806
Prior accident year development [1] (425) (522)
Total incurred 9,177 8,284
Paid related to [Abstract]    
Current accident year 2,348 2,312
Prior accident years 5,976 5,836
Total paid 8,324 8,148
Ending liabilities for unpaid losses, claims and loss adjustment expenses, net 41,630 39,886
Plus: Reinsurance recoverable on unpaid losses 7,158 9,011
Ending liabilities for unpaid losses, claims and loss adjustment expenses, gross 48,788 48,897
Medicare Supplement Insurance Products [Member]    
Liabilities for Unpaid Losses, Claims and Loss Adjustment Expenses [Roll Forward]    
Beginning liabilities for unpaid losses, claims and loss adjustment expenses, gross 15,859 11,263
Less: Reinsurance recoverable on unpaid losses (4,748) (990)
Beginning liabilities for unpaid losses, claims and loss adjustment expenses, net 11,111 10,273
Incurred related to [Abstract]    
Current accident year 17,615 18,035
Prior accident year development 3,343 [2] 241
Total incurred 20,958 18,276
Paid related to [Abstract]    
Current accident year 5,873 8,797
Prior accident years 13,252 8,354
Total paid 19,125 17,151
Ending liabilities for unpaid losses, claims and loss adjustment expenses, net 12,944 11,398
Plus: Reinsurance recoverable on unpaid losses 6,535 1,819
Ending liabilities for unpaid losses, claims and loss adjustment expenses, gross 19,479 13,217
Other Life and Health Insurance Products [Member]    
Liabilities for Unpaid Losses, Claims and Loss Adjustment Expenses [Roll Forward]    
Beginning liabilities for unpaid losses, claims and loss adjustment expenses, gross 1,833 1,743
Less: Reinsurance recoverable on unpaid losses 0 0
Beginning liabilities for unpaid losses, claims and loss adjustment expenses, net 1,833 1,743
Incurred related to [Abstract]    
Current accident year 2,516 1,527
Prior accident year development (284) 653
Total incurred 2,232 2,180
Paid related to [Abstract]    
Current accident year 998 1,056
Prior accident years 1,214 1,221
Total paid 2,212 2,277
Ending liabilities for unpaid losses, claims and loss adjustment expenses, net 1,853 1,646
Plus: Reinsurance recoverable on unpaid losses 0 0
Ending liabilities for unpaid losses, claims and loss adjustment expenses, gross $ 1,853 $ 1,646
[1] In establishing property and casualty reserves, the Company initially reserves for losses at the higher end of the reasonable range if no other value within the range is determined to be more probable. Selection of such an initial loss estimate is an attempt by management to give recognition that initial claims information received generally is not conclusive with respect to legal liability, is generally not comprehensive with respect to magnitude of loss and generally, based on historical experience, will develop more adversely as time passes and more information becomes available. However, as a result, the Company generally experiences reserve redundancies when analyzing the development of prior year losses in a current period.
[2] The prior accident year development for Medicare supplement insurance products was primarily due to influenza, the usual driver of elevated morbidity in winter, which was significantly higher than in the previous year and ultimately had an unfavorable effect on the Company's loss patterns.