Segmented Information Revenues by reportable segment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net premiums earned   $ 117,433 $ 117,593  
Other income   15,462 9,315  
Total revenues   159,966 158,224  
Service fee and commission income   22,966 24,659  
Net investment income   2,918 1,616  
Net realized gains   1,197 5,041  
Other-than-temporary impairment loss   10 0  
Other Nonoperating Income   6,157 430  
Property, Liability and Casualty Insurance Product Line [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net premiums earned   117,433 113,479  
Other income   8,937 8,478  
Total revenues   126,370 121,957  
6400 to 6499 Insurance Agents, Brokers and Services [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Other income   368 407  
Total revenues   23,334 25,066  
Service fee and commission income   22,966 24,659  
Operating Segments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenues   149,704 147,023  
Other Segments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net premiums earned     4,114 $ 4,114
Net investment income $ 0 $ 0 $ 4,114