Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Other Investments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
LIHTC
Investments	$ 186,916,000		$ 186,916,000		$ 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	$ 5,633,000		$ 16,899,000
Estimated amortization	6,219,000		18,655,000
Impairment losses	0	$ 0	0	$ 0
Other liabilities
LIHTC
Unfunded commitments	$ 22,741,000		$ 22,741,000		$ 34,126,000