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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, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
After-tax: |  |  |  |  |  |  |  |
Other comprehensive income (loss) | $ 5,160 | $ 11,955 | $ 11,984 | $ (737) | $ (1,849) | $ (4,050) | $ 29,099 | $ (6,636)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |  |  |  |  |
OCI, Pre-tax: |  |  |  |  |  |  |  |
Pre-tax, Unrealized holding gains (losses) arising during the period | 6,815 |  |  | (989) |  |  | 38,685 | (11,511)
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income | 22 |  |  | 10 |  |  | (87) | 2,807
Pre-tax, Other comprehensive income (loss) | 6,837 |  |  | (979) |  |  | 38,598 | (8,704)
OCI, Tax: |  |  |  |  |  |  |  |
Tax, Unrealized holding gains (losses) arising during the period | 1,671 |  |  | (244) |  |  | 9,520 | (2,751)
Income taxes | 6 |  |  | 2 |  |  | (21) | 683
Tax, Other comprehensive income (loss) | 1,677 |  |  | (242) |  |  | 9,499 | (2,068)
After-tax: |  |  |  |  |  |  |  |
After-tax, Unrealized holding gains (losses) arising during the period | 5,144 |  |  | (745) |  |  | 29,165 | (8,760)
After-tax, Less: Reclassification adjustments (gains) losses realized in net income | 16 |  |  | 8 |  |  | (66) | 2,124
Other comprehensive income (loss) | $ 5,160 |  |  | $ (737) |  |  | $ 29,099 | $ (6,636)

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