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Reportable Segments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Net premiums earned $ 69,141 $ 71,235 $ 68,726 $ 66,909 $ 65,995 $ 65,445 $ 65,449 $ 66,446 $ 276,011 $ 263,335 $ 261,627
Reconciliation from Segment Totals to Consolidated [Abstract]                      
Net investment income                 14,483 12,498 9,055
Income before federal income taxes                 43,054 33,952 44,398
Reportable Segments [Member]                      
Segment Reporting Information [Line Items]                      
Direct and assumed premium written                 403,004 383,553 382,388
Net premiums earned                 276,011 263,335 261,627
Segment underwriting gain (loss)                 4,225 22,775 18,368
Reconciliation from Segment Totals to Consolidated [Abstract]                      
Segment underwriting gain                 4,225 22,775 18,368
Reportable Segments [Member] | Property and Casualty Insurance [Member]                      
Segment Reporting Information [Line Items]                      
Direct and assumed premium written                 395,625 366,668 343,200
Net premiums earned                 264,753 242,364 224,683
Segment underwriting gain (loss)                 12,424 24,279 16,221
Reconciliation from Segment Totals to Consolidated [Abstract]                      
Segment underwriting gain                 12,424 24,279 16,221
Reportable Segments [Member] | Reinsurance [Member]                      
Segment Reporting Information [Line Items]                      
Direct and assumed premium written                 7,379 16,885 39,188
Net premiums earned                 11,258 20,971 36,944
Segment underwriting gain (loss)                 (8,199) (1,504) 2,147
Reconciliation from Segment Totals to Consolidated [Abstract]                      
Segment underwriting gain                 (8,199) (1,504) 2,147
Segment Reconciling Items [Member]                      
Reconciliation from Segment Totals to Consolidated [Abstract]                      
Net investment income                 14,483 12,498 9,055
Net realized gains (losses) on investments                 23,228 (1,261) 14,930
Corporate and other income (expenses)                 $ 1,118 $ (60) $ 2,045