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Investments - Realized Gains (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale [Abstract] |  |  |
Proceeds from sales, calls and maturities of securities available for sale | $ 266,900 | $ 36,213 |
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |
Realized gain on available-for-sale securities | 66 |  |
Net gains (losses) on sales and calls of securities | $ (2,883) | $ 45 | $ 396

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- Definition Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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