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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Other Investments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
LIHTC
Investments	$ 193,135,000		$ 193,135,000		$ 200,245,000
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration]	Other Long-term Investments		Other Long-term Investments		Other Long-term Investments
Estimated tax credits			$ 11,266,000
Estimated amortization			12,437,000
Impairment losses	$ 0	$ 0	0	$ 0
Other liabilities
LIHTC
Unfunded commitments	$ 21,251,000		$ 21,251,000		$ 34,126,000

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Amount of impairment loss for investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under tax credit program not meeting condition for accounting under proportional amortization method.

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