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Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ 562,477 | $ 564,292 | $ 564,278 | $ 552,568 | $ 562,477
Other comprehensive income (loss), net of tax |  | 4,257 | (1,117) | 8,454 | (7,438)
Balance at end of period |  | 564,458 | 571,707 | 564,458 | 571,707
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) | (2,642) | (11,523) | (8,536) | (3,188)
Other comprehensive income before reclassification, before tax |  | 6,548 | (1,502) | 13,167 | (10,366)
Reclassification from accumulated other comprehensive income, before tax |  | (570) | (67) | (1,295) | (67)
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, before tax | 529 |  |  |  | 529
Period change, before tax |  | 5,978 | (1,569) | 11,872 | (9,904)
Balance at end of period |  | 3,336 | (13,092) | 3,336 | (13,092)
Tax Benefit (Expense) |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period, tax | 1,319 | 760 | 3,316 | 2,457 | 1,319
Other comprehensive (loss) income before reclassification, tax |  | (1,721) | 452 | (3,418) | 2,995
Reclassification from accumulated other comprehensive income, tax |  |  |  | 0 | 0
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, tax | (546) |  |  |  | (546)
Period change, tax |  | (1,721) | 452 | (3,418) | 2,449
Balance at end of period, tax |  | (961) | 3,768 | (961) | 3,768
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | (1,869) | (1,882) | (8,207) | (6,079) | (1,869)
Other comprehensive income before reclassification, net of tax |  | 4,827 | (1,050) | 9,749 | (7,371)
Reclassification from accumulated other comprehensive income |  | (570) | (67) | (1,295) | (67)
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, net of tax | $ (17) |  |  |  | (17)
Other comprehensive income (loss), net of tax |  | 4,257 | (1,117) | 8,454 | (7,455)
Balance at end of period |  | $ 2,375 | $ (9,324) | $ 2,375 | $ (9,324)

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