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Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at end of period |  | $ (15,861) | $ 497 | $ (15,861) | $ 497
Balance at beginning of period | $ 562,477 |  |  | 562,477 | 531,025
Other comprehensive (loss) income, net of tax |  | (1,971) | 153 | (9,409) | 2,684
Balance at end of period |  | 567,748 | 559,247 | 567,748 | 559,247
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | (3,188) | (13,092) | 235 | (3,188) | (4,089)
Other comprehensive income before reclassification, before tax |  | (2,750) | 529 | (13,115) | 6,059
Reclassification from accumulated other comprehensive income, before tax |  | (19) | (267) | (87) | (1,473)
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, before tax | 529 |  |  | 529 |
Period change, before tax |  | (2,769) | 262 | (12,673) | 4,586
Balance at end of period |  | (15,861) | 497 | (15,861) | 497
Tax Expense Benefit [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period, tax | 1,319 | 3,768 | (98) | 1,319 | 1,695
Other comprehensive (loss) income before reclassification, tax |  | 798 | (109) | 3,793 | (1,902)
Reclassification from accumulated other comprehensive income, tax |  | 0 | 0 | 0 | 0
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, tax | (546) |  |  | (546) |
Period change, tax |  | 798 | (109) | 3,247 | (1,902)
Balance at end of period, tax |  | 4,566 | (207) | 4,566 | (207)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | (1,869) | (9,324) | 137 | (1,869) | (2,394)
Other comprehensive income before reclassification, net of tax |  | (1,952) | 420 | (9,322) | 4,157
Reclassification from accumulated other comprehensive income |  | (19) | (267) | (87) | (1,473)
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, net of tax | $ (17) |  |  | (17) |
Other comprehensive (loss) income, net of tax |  | (1,971) | 153 | (9,426) | 2,684
Balance at end of period |  | $ (11,295) | $ 290 | $ (11,295) | $ 290

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