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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, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
After-tax: |  |  |  |  |  |
Other comprehensive income | $ 26,068 | $ (8,946) | $ 11,955 | $ 11,984 | $ 17,122 | $ 23,939
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |  |  |
OCI, Pre-tax: |  |  |  |  |  |
Pre-tax, Unrealized holding gains arising during the period | 34,661 |  | 15,825 |  | 23,435 | 31,870
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income | (168) |  | 36 |  | (467) | (109)
Pre-tax, Other comprehensive income | 34,493 |  | 15,861 |  | 22,968 | 31,761
OCI, Tax: |  |  |  |  |  |
Tax, Unrealized holding gains arising during the period | 8,466 |  | 3,896 |  | 5,961 | 7,849
Income taxes | (41) |  | 10 |  | (115) | (27)
Tax, Other comprehensive income | 8,425 |  | 3,906 |  | 5,846 | 7,822
After-tax: |  |  |  |  |  |
After-tax, Unrealized holding gains arising during the period | 26,195 |  | 11,929 |  | 17,474 | 24,021
After-tax, Less: Reclassification adjustments (gains) realized in net income | (127) |  | 26 |  | (352) | (82)
Other comprehensive income | $ 26,068 |  | $ 11,955 |  | 17,122 | $ 23,939
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Cumulative Effect, Period Of Adoption, Adjustment [Member] |  |  |  |  |  |
OCI, Pre-tax: |  |  |  |  |  |
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income |  |  |  |  | 791 |
OCI, Tax: |  |  |  |  |  |
Income taxes |  |  |  |  | 194 |
After-tax: |  |  |  |  |  |
After-tax, Less: Reclassification adjustments (gains) realized in net income |  |  |  |  | 597 |
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |  |
OCI, Pre-tax: |  |  |  |  |  |
Pre-tax, Other comprehensive income |  |  |  |  | 23,759 |
OCI, Tax: |  |  |  |  |  |
Tax, Other comprehensive income |  |  |  |  | 6,040 |
After-tax: |  |  |  |  |  |
Other comprehensive income |  |  |  |  | $ 17,719 |

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