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Accumulated Other Comprehensive Income (Loss) - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Reclassification from accumulated other comprehensive income |  | $ 499 | $ (15,712)
Balance at beginning of period | $ (3,421) |  |
Balance at end of period | (35,973) | (3,421) |
Balance at beginning of period | 643,417 | 577,044 | 563,267
Other comprehensive income (loss), net of tax | (80,542) | (11,519) | (306)
Balance at end of period | 637,515 | 643,417 | 577,044
Unrealized Gains and Losses on Available for Sale Securities |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (11,864) | 4,323 | 4,752
Other comprehensive income (loss) before reclassification | (113,094) | (16,686) | 15,283
Reclassification from accumulated other comprehensive income |  | 499 | (15,712)
Net current period other comprehensive income | (113,094) | (16,187) | (429)
Balance at end of period | (124,958) | (11,864) | 4,323
Tax Benefit (Expense) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 3,421 | (1,247) | (1,370)
Other comprehensive income (loss) before reclassification | 32,552 | 4,668 | 123
Reclassification from accumulated other comprehensive income |  | 0 | 0
Net current period other comprehensive income | 32,552 | 4,668 | 123
Balance at end of period | 35,973 | 3,421 | (1,247)
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (8,443) | 3,076 | 3,382
Other comprehensive income (loss) before reclassification | (80,542) | (12,018) | 15,406
Reclassification from accumulated other comprehensive income |  | 499 | (15,712)
Other comprehensive income (loss), net of tax | (80,542) | (11,519) | (306)
Balance at end of period | $ (88,985) | $ (8,443) | $ 3,076

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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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