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Accumulated Other Comprehensive Income (Loss) - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Reclassification from accumulated other comprehensive income | $ (499) | $ 15,712 | $ 1,295
Balance at beginning of period | 1,247 |  |
Balance at end of period | (3,421) | 1,247 |
Balance at beginning of period | 577,044 | 563,267 | 552,568
Other comprehensive income (loss), net of tax | (11,519) | (306) | 9,461
Balance at end of period | 643,417 | 577,044 | 563,267
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 | 4,323 | 4,752 | (8,536)
Other comprehensive income (loss) before reclassification | (16,686) | 15,283 | 14,583
Reclassification from accumulated other comprehensive income | 499 | (15,712) | (1,295)
Net current period other comprehensive income | (16,187) | (429) | 13,288
Balance at end of period | (11,864) | 4,323 | 4,752
Tax Benefit (Expense) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (1,247) | (1,370) | 2,457
Other comprehensive income (loss) before reclassification | 4,668 | 123 | (3,827)
Reclassification from accumulated other comprehensive income | 0 | 0 | 0
Net current period other comprehensive income | 4,668 | 123 | (3,827)
Balance at end of period | 3,421 | (1,247) | (1,370)
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 3,076 | 3,382 | (6,079)
Other comprehensive income (loss) before reclassification | (12,018) | 15,406 | 10,756
Reclassification from accumulated other comprehensive income | 499 | (15,712) | (1,295)
Other comprehensive income (loss), net of tax | (11,519) | (306) | 9,461
Balance at end of period | $ (8,443) | $ 3,076 | $ 3,382

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