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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 | 9 Months Ended |
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments |  |  |  |  |
Equity Securities | $ 5,158,000 |  | $ 5,158,000 |  | $ 5,358,000
Summary of unrealized and realized gains and losses recognized in net income on equity securities |  |  |  |  |
Net losses recognized during the period on equity securities | (142,000) | $ (230,000) | (200,000) | $ (728,000) |
Unrealized gain on equity securities with readily determinable fair values | $ (142,000) | $ (230,000) | $ (200,000) | $ (728,000) |

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