Investment Securities - Additional Information (Details) $ in Thousands	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 ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]
Accrued interest receivable	$ 65,541		$ 65,541		$ 61,002
Realized loss on sale of investment securities	6,879	$ 2,147	9,981	$ 4,987
Carrying Value Of Investment Securities Pledged	$ 7,200,000		$ 7,200,000		4,100,000
Number of available for sale debt securities in unrealized loss positions | Security	399		399
Available-for-sale Securities
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]
Accrued interest receivable	$ 9,900		$ 9,900		11,700
Realized loss on sale of investment securities	4,600
Held-to-maturity Securities
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]
Accrued interest receivable	$ 10,100		$ 10,100		$ 9,200