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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
OCI, Pre-tax: |  |  |  |  |
Pre-tax, Other comprehensive income (loss) |  |  | $ 203 | $ (3,888) |
Pre-tax, Reclassification adjustments to retained earnings |  |  |  |  | $ 5,830
Pre-tax, Change in accumulated other comprehensive income (loss) |  | $ (478) |  |  |
OCI, Tax: |  |  |  |  |
Tax, Other comprehensive income (loss) |  |  | 76 | (1,486) |
Tax, Reclassification adjustments to retained earnings |  |  |  |  | 2,811
Tax, Change in accumulated other comprehensive income (loss) |  | 1,251 |  |  |
After-tax: |  |  |  |  |
Other comprehensive income (loss) | [1] | (4,748) | 127 | (2,402) |
After-tax, Reclassification adjustments to retained earnings |  |  |  |  | $ 3,019
After-tax, Change in accumulated other comprehensive income (loss) |  | (1,729) |  |  |
Net changes related to available-for-sale securities: |  |  |  |  |
OCI, Pre-tax: |  |  |  |  |
Pre-tax, Unrealized holding gains (losses) arising during the period |  | (9,111) | 2,773 | (1,594) |
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income |  | 2,803 | (2,570) | (2,294) |
Pre-tax, Other comprehensive income (loss) |  | (6,308) | 203 | (3,888) |
OCI, Tax: |  |  |  |  |
Tax, Unrealized holding gains (losses) arising during the period |  | (2,254) | 1,058 | (609) |
Tax, Less: Reclassification adjustments (gains) losses realized in net income |  | 694 | (982) | (877) |
Tax, Other comprehensive income (loss) |  | (1,560) | 76 | (1,486) |
After-tax: |  |  |  |  |
After-tax, Unrealized holding gains (losses) arising during the period |  | (6,857) | 1,715 | (985) |
After-tax, Less: Reclassification adjustments (gains) losses realized in net income |  | 2,109 | (1,588) | (1,417) |
Other comprehensive income (loss) |  | $ (4,748) | $ 127 | $ (2,402) |
[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 $1,560 thousand and $1,486 thousand for the years ended December 31, 2018 and 2016, respectively.

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