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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Unrealized and realized gains and losses recognized in net income on equity securities (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments |  |  |  |  |
Equity Securities | $ 5,337,000 |  | $ 5,337,000 |  | $ 5,417,000
Summary of unrealized and realized gains and losses recognized in net income on equity securities |  |  |  |  |
Net losses recognized during the period on equity securities | (23,000) | $ (92,000) | (80,000) | $ (58,000) |
Unrealized gain on equity securities with readily determinable fair values | $ (23,000) | $ (92,000) | $ (80,000) | $ (58,000) |

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