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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
After-tax: |  |  |  |  |  |
Other comprehensive income (loss) | $ 11,955 | $ 11,984 | $ (1,849) | $ (4,050) | $ 23,939 | $ (5,899)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |  |  |
OCI, Pre-tax: |  |  |  |  |  |
Pre-tax, Unrealized holding gains (losses) arising during the period | 15,825 |  | (2,488) |  | 31,870 | (10,522)
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income | 36 |  | 32 |  | (109) | 2,797
Pre-tax, Other comprehensive income (loss) | 15,861 |  | (2,456) |  | 31,761 | (7,725)
OCI, Tax: |  |  |  |  |  |
Tax, Unrealized holding gains (losses) arising during the period | 3,896 |  | (618) |  | 7,849 | (2,507)
Tax, Less: Reclassification adjustments (gains) losses realized in net income | 10 |  | 11 |  | (27) | 681
Tax, Other comprehensive income (loss) | 3,906 |  | (607) |  | 7,822 | (1,826)
After-tax: |  |  |  |  |  |
After-tax, Unrealized holding gains (losses) arising during the period | 11,929 |  | (1,870) |  | 24,021 | (8,015)
After-tax, Less: Reclassification adjustments (gains) losses realized in net income | 26 |  | 21 |  | (82) | 2,116
Other comprehensive income (loss) | $ 11,955 |  | $ (1,849) |  | $ 23,939 | $ (5,899)

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