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Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2018 | Mar. 31, 2019 | Mar. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | $ 562,477 | $ 552,568 | $ 562,477
Other comprehensive income (loss), net of tax |  | 4,197 | (6,321)
Balance at end of period |  | 564,292 | 564,278
Unrealized Gains and Losses on Available for Sale Securities |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (3,188) | (8,536) | (3,188)
Other comprehensive income before reclassification, before tax |  | 6,619 | (8,864)
Reclassification from accumulated other comprehensive income, before tax |  | (725) | 529
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, before tax | 529 |  |
Period change, before tax |  | 5,894 | (8,335)
Balance at end of period |  | (2,642) | (11,523)
Tax Benefit (Expense) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period, tax | 1,319 | 2,457 | 1,319
Other comprehensive (loss) income before reclassification, tax |  | (1,697) | 2,543
Reclassification from accumulated other comprehensive income, tax |  | 0 | (546)
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, tax | (546) |  |
Period change, tax |  | (1,697) | 1,997
Balance at end of period, tax |  | 760 | 3,316
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (1,869) | (6,079) | (1,869)
Other comprehensive income before reclassification, net of tax |  | 4,922 | (6,321)
Reclassification from accumulated other comprehensive income |  | (725) | (17)
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, net of tax | $ (17) |  |
Other comprehensive income (loss), net of tax |  | 4,197 | (6,338)
Balance at end of period |  | $ (1,882) | $ (8,207)

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