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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
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)