Investment Securities - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) security	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) security	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Investments, Debt and Equity Securities [Abstract]
Equity securities without readily determinable fair value	$ 58,100,000		$ 58,100,000
Upward adjustments of equity securities without readily determinable fair values	0	$ 0	0	$ 0
Downward adjustments of equity securities without readily determinable fair values	0	0	0	0
Impairment of equity securities without readily determinable fair values	489,000	5,000	489,000	4,362,000
Pledged securities	$ 7,100,000,000	$ 2,800,000,000	$ 7,100,000,000	$ 2,800,000,000	$ 2,500,000,000
Number of securities by a single non-government sponsored issuer exceeding 10% of shareholders' equity | security	0		0