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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, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
After-tax |  |  |  |  |  |
Other comprehensive income (loss) | $ 7,996 | $ (16,910) | $ 26,068 | $ (8,946) | $ (8,914) | $ 17,122
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |  |  |  |
Pre-tax |  |  |  |  |  |
Unrealized holding gains arising during the period | 10,264 |  | 34,661 |  | (12,161) | 23,435
Less: Reclassification adjustments for (gains) losses realized in net income | 245 |  | (168) |  | 447 | (467)
Other comprehensive income (loss) | 10,509 |  | 34,493 |  | (11,714) | 22,968
Tax |  |  |  |  |  |
Unrealized holding gains arising during the period | 2,454 |  | 8,466 |  | (2,907) | 5,961
Income taxes | 59 |  | (41) |  | 107 | (115)
Other comprehensive income (loss) | 2,513 |  | 8,425 |  | (2,800) | 5,846
After-tax |  |  |  |  |  |
Unrealized holding gains arising during the period | 7,810 |  | 26,195 |  | (9,254) | 17,474
Less: Reclassification adjustments for (gains) losses realized in net income | 186 |  | (127) |  | 340 | (352)
Other comprehensive income (loss) | $ 7,996 |  | $ 26,068 |  | (8,914) | 17,122
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Cumulative effect of change in accounting principle (ASU 2016-13) |  |  |  |  |  |
Pre-tax |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  | 0 | 791
Tax |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  | 0 | 194
After-tax |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  | 0 | 597
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Change in accumulated other comprehensive income |  |  |  |  |  |
Pre-tax |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  | (11,714) | 23,759
Tax |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  | (2,800) | 6,040
After-tax |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  | $ (8,914) | $ 17,719

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