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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, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
After-tax: |  |  |  |  |  |  |  |
Other comprehensive income (loss) | $ (36,421) | $ 26,068 | $ (8,946) | $ 5,160 | $ 11,955 | $ 11,984 | $ (19,299) | $ 29,099
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |  |  |  |  |
OCI, Pre-tax: |  |  |  |  |  |  |  |
Pre-tax, Unrealized holding gains arising during the period | 5,518 |  |  | 6,815 |  |  | 28,953 | 38,685
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income (loss) | (53,827) |  |  | 22 |  |  | (54,294) | (87)
Pre-tax, Other comprehensive income (loss) | (48,309) |  |  | 6,837 |  |  | (25,341) | 38,598
OCI, Tax: |  |  |  |  |  |  |  |
Tax, Unrealized holding gains arising during the period | 1,359 |  |  | 1,671 |  |  | 7,320 | 9,520
Income taxes | (13,247) |  |  | 6 |  |  | (13,362) | (21)
Tax, Other comprehensive income (loss) | (11,888) |  |  | 1,677 |  |  | (6,042) | 9,499
After-tax: |  |  |  |  |  |  |  |
After-tax, Unrealized holding gains arising during the period | 4,159 |  |  | 5,144 |  |  | 21,633 | 29,165
After-tax, Less: Reclassification adjustments (gains) realized in net income (loss) | (40,580) |  |  | 16 |  |  | (40,932) | (66)
Other comprehensive income (loss) | $ (36,421) |  |  | $ 5,160 |  |  | (19,299) | $ 29,099
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 (loss) |  |  |  |  |  |  | 791 |
OCI, Tax: |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  | 194 |
After-tax: |  |  |  |  |  |  |  |
After-tax, Less: Reclassification adjustments (gains) realized in net income (loss) |  |  |  |  |  |  | 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) |  |  |  |  |  |  | (24,550) |
OCI, Tax: |  |  |  |  |  |  |  |
Tax, Other comprehensive income (loss) |  |  |  |  |  |  | (5,848) |
After-tax: |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  | $ (18,702) |

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