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Other Comprehensive Income (Loss) - Summary of Unrealized Gains and Losses on Available-for-Sale Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance at beginning of period | $ 232,003 | $ 227,685 | $ 228,923 | $ 245,657
Other comprehensive loss | (9,340) | (14,506) | (8,262) | (45,423)
Balance at end of period | 226,665 | 219,917 | 226,665 | 219,917
Accumulated Net Investment Gain (Loss) Attributable to Parent |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance at beginning of period | (43,781) | (32,795) | (44,718) | (1,718)
Unrealized losses arising during the period | (12,748) | (18,812) | (11,562) | (58,149)
Reclassification of net realized gains during the period | 0 | (6) | 0 | (7)
Related deferred taxes | 2,677 | 3,952 | 2,428 | 12,213
Other comprehensive loss | (10,071) | (14,866) | (9,134) | (45,943)
Balance at end of period | $ (53,852) | $ (47,661) | $ (53,852) | $ (47,661)

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