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
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

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

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