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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 |
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Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments |  |  |
Equity Securities | $ 5,360,000 |  | $ 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 |  | $ 34,000 |
Less: Net gains and (losses) recognized during the period on equity securities sold during the period | (57,000) |  |
Unrealized gain on equity securities with readily determinable fair values | $ (57,000) | $ 34,000 |

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