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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
After-tax |  |  |  |  |  |  |  |
Other comprehensive income (loss) | $ (1,827) | $ 7,996 | $ (16,910) | $ (36,421) | $ 26,068 | $ (8,946) | $ (10,741) | $ (19,299)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |  |  |  |  |  |
Pre-tax |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | (1,635) |  |  | 5,518 |  |  | (13,796) | 28,953
Less: Reclassification adjustments for (gains) losses realized in net income (loss) | (690) |  |  | (53,827) |  |  | (243) | (54,294)
Other comprehensive income (loss) | (2,325) |  |  | (48,309) |  |  | (14,039) | (25,341)
Tax |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | (334) |  |  | 1,359 |  |  | (3,241) | 7,320
Income taxes | (164) |  |  | (13,247) |  |  | (57) | (13,362)
Other comprehensive income (loss) | (498) |  |  | (11,888) |  |  | (3,298) | (6,042)
After-tax |  |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period | (1,301) |  |  | 4,159 |  |  | (10,555) | 21,633
Less: Reclassification adjustments for (gains) losses realized in net income (loss) | (526) |  |  | (40,580) |  |  | (186) | (40,932)
Other comprehensive income (loss) | $ (1,827) |  |  | $ (36,421) |  |  | (10,741) | (19,299)
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 (loss) |  |  |  |  |  |  |  |
Pre-tax |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  | (14,039) | (24,550)
Tax |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  | (3,298) | (5,848)
After-tax |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  | $ (10,741) | $ (18,702)

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