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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, 2020 | Mar. 31, 2019
After-tax: |  |
Other comprehensive income (loss) | $ (8,946) | $ 11,984
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |
OCI, Pre-tax: |  |
Pre-tax, Unrealized holding gains (losses) arising during the period | (11,226) | 16,045
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income | (299) | (145)
Pre-tax, Other comprehensive income (loss) | (11,525) | 15,900
OCI, Tax: |  |
Tax, Unrealized holding gains (losses) arising during the period | (2,505) | 3,953
Income taxes | (74) | (37)
Tax, Other comprehensive income (loss) | (2,579) | 3,916
After-tax: |  |
After-tax, Unrealized holding gains (losses) arising during the period | (8,721) | 12,092
After-tax, Less: Reclassification adjustments (gains) losses realized in net income | (225) | (108)
Other comprehensive income (loss) | (8,946) | $ 11,984
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) losses 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 (loss) | (10,734) |
OCI, Tax: |  |
Tax, Other comprehensive income (loss) | (2,385) |
After-tax: |  |
Other comprehensive income (loss) | $ (8,349) |

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