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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments |  |  |  |  |
Equity Securities | $ 5,546,000 |  | $ 5,546,000 |  | $ 5,394,000
Summary of unrealized and realized gains and losses recognized in net income on equity securities |  |  |  |  |
Net gains recognized during the period on equity securities | 63,000 | $ 201,000 | 152,000 | $ 121,000 |
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date | $ 63,000 | $ 201,000 | $ 152,000 | $ 121,000 |

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