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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
After-tax: |  |  |
Other comprehensive income (loss), net of taxes | $ (17,618) | $ 28,374 | $ (4,748)
Net changes related to available-for-sale securities [Member] |  |  |
OCI, Pre-tax: |  |  |
Pre-tax, Unrealized holding gains (losses) arising during the period | 33,575 | 38,129 | (9,111)
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income | (56,914) | (492) | 2,803
Pre-tax, Other comprehensive income (loss) | (23,339) | 37,637 | (6,308)
OCI, Tax: |  |  |
Tax, Unrealized holding gains (losses) arising during the period | 7,884 | 9,384 | (2,254)
Tax, Less: Reclassification adjustments (gains) losses realized in net income | (13,605) | (121) | 694
Tax, Other comprehensive income (loss) | (5,721) | 9,263 | (1,560)
After-tax: |  |  |
After-tax, Unrealized holding gains (losses) arising during the period | 25,691 | 28,745 | (6,857)
After-tax, Less: Reclassification adjustments (gains) losses realized in net income | (43,309) | (371) | 2,109
Other comprehensive income (loss), net of taxes | (17,618) | 28,374 | (4,748)
Net changes related to available-for-sale securities [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
OCI, Pre-tax: |  |  |
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income | 791 | 0 | 5,830
OCI, Tax: |  |  |
Tax, Less: Reclassification adjustments (gains) losses realized in net income | 194 | 0 | 2,811
After-tax: |  |  |
After-tax, Less: Reclassification adjustments (gains) losses realized in net income | 597 | 0 | 3,019
Net changes related to available-for-sale securities [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |
OCI, Pre-tax: |  |  |
Pre-tax, Other comprehensive income (loss) | (22,548) | 37,637 | (478)
OCI, Tax: |  |  |
Tax, Other comprehensive income (loss) | (5,527) | 9,263 | 1,251
After-tax: |  |  |
Other comprehensive income (loss), net of taxes | $ (17,021) | $ 28,374 | $ (1,729)

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