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Comprehensive Income (Loss) - Schedule of Components of Other Comprehensive Income or Loss and Related Tax Effects Allocated to Each Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Before Tax        
Unrealized gain (loss) arising during the period, Before Tax $ 2,234 $ (6,021) $ 10,290 $ (9,196)
Other-than-temporary impairment loss, Before Tax 224 1,886 1,441 3,869
Call and repayment losses charged to investment income, Before Tax 3 15 14 70
Reclassification adjustment for realized (gains) losses, Before Tax (583) 296 (899) 563
Total other comprehensive income (loss), Before Tax 1,878 (3,824) 10,846 (4,694)
Income Tax Expense (Benefit)        
Unrealized gain (loss) arising during the period, Income Tax Expense (Benefit) 862 (2,324) 3,970 (3,548)
Other-than-temporary impairment loss, Income Tax Expense (Benefit) 86 728 556 1,493
Call and repayment losses charged to investment income, Income Tax Expense (Benefit) 1 6 5 27
Reclassification adjustment for realized (gains) losses, Income Tax Expense (Benefit) (225) 114 (347) 217
Total other comprehensive income (loss), Income Tax Expense (Benefit) 724 (1,476) 4,184 (1,811)
Net of Tax        
Unrealized gain (loss) arising during the period, 1,372 (3,697) 6,320 (5,648)
Other-than-temporary impairment loss, Net of Tax 138 1,158 885 2,376
Call and repayment losses charged to investment income, Net of Tax 2 9 9 43
Reclassification adjustment for realized (gains) losses, Net of Tax (358) 182 (552) 346
Total other comprehensive income (loss), net of income taxes $ 1,154 $ (2,348) $ 6,662 $ (2,883)