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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity [Abstract]      
Net unrealized gains (losses) on investments available for sale arising during the period, Pre-tax $ (1,594) $ (2,480) $ 3,252
Less: Amounts reclassified from accumulated other comprehensive income (loss), Pre-tax (2,294) (1,060) (5,627)
Net current period other comprehensive income (loss), Pre-tax (3,888) (3,540) (2,375)
Net unrealized gains (losses) on investments available for sale arising during the period, Tax (609) (963) 1,255
Less: Amounts reclassified from accumulated other comprehensive income (loss), Tax (877) (406) (2,171)
Net current period other comprehensive income (loss), Tax (1,486) (1,369) (916)
Net unrealized gains (losses) on investments available for sale arising during the period, After-tax (985) (1,517) 1,997
Less: Amounts reclassified from accumulated other comprehensive income (loss), After-tax (1,417) (654) (3,456)
Net current period other comprehensive income (loss), After-tax [1] $ (2,402) $ (2,171) $ (1,459)
[1] Represents change in fair value of available for sale investments, net of tax benefit of $1,486 thousand, $1,369 thousand and $916 thousand in years ended December 31, 2016, 2015 and 2014, respectively.