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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
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
After-tax |  |
Other comprehensive income (loss) | $ (16,910) | $ (8,946)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |
Pre-tax |  |
Unrealized holding gains arising during the period | (22,425) | (11,226)
Less: Reclassification adjustments for (gains) losses realized in net income | 202 | (299)
Other comprehensive income (loss) | (22,223) | (11,525)
Tax |  |
Unrealized holding gains arising during the period | (5,361) | (2,505)
Income taxes | 48 | (74)
Other comprehensive income (loss) | (5,313) | (2,579)
After-tax |  |
Unrealized holding gains arising during the period | (17,064) | (8,721)
Less: Reclassification adjustments for (gains) losses realized in net income | 154 | (225)
Other comprehensive income (loss) | (16,910) | (8,946)
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) | (22,223) | (10,734)
Tax |  |
Other comprehensive income (loss) | (5,313) | (2,385)
After-tax |  |
Other comprehensive income (loss) | $ (16,910) | $ (8,349)

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