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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Net unrealized gains (losses) on investments available for sale arising during the period, Pre-tax $ 2,773 $ (1,594) $ (2,480)
Less: Amounts reclassified from accumulated other comprehensive income (loss), Pre-tax (2,570) (2,294) (1,060)
Net current period other comprehensive income (loss), Pre-tax 203 (3,888) (3,540)
Net unrealized gains (losses) on investments available for sale arising during the period, Tax 1,058 (609) (963)
Less: Amounts reclassified from accumulated other comprehensive income (loss), Tax (982) (877) (406)
Net current period other comprehensive income (loss), Tax 76 (1,486) (1,369)
Net unrealized gains (losses) on investments available for sale arising during the period, After-tax 1,715 (985) (1,517)
Less: Amounts reclassified from accumulated other comprehensive income (loss), After-tax (1,588) (1,417) (654)
Net current period other comprehensive income (loss), After-tax [1] $ 127 $ (2,402) $ (2,171)
[1] Represents change in fair value of available for sale investments, net of income tax provision of $76 thousand for the year ended December 31, 2017 and a change in fair value of available for sale investments, net of income tax benefit of $1,486 thousand and $1,369 thousand for the years ended December 31, 2016 and 2015, respectively.