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Securities - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Additional disclosures
Carrying amount of the securities pledged to collateralize repurchase agreements	$ 7,232,274,000	$ 7,463,871,000
Other investment securities	0
Asset Pledged as Collateral [Member]
Additional disclosures
Investment securities market value	2,200,000,000	3,000,000,000.0
Carrying value of public fund deposits	2,400,000,000	3,200,000,000
Asset Pledged as Collateral [Member] | Public Funds Deposits
Additional disclosures
Carrying value of public fund deposits	2,200,000,000	2,400,000,000
Asset Pledged as Collateral [Member] | FHLB Advances
Additional disclosures
Carrying value of public fund deposits	145,400,000	729,400,000
Asset Pledged as Collateral [Member] | Interest rate swap
Additional disclosures
Carrying value of public fund deposits	$ 111,200,000	$ 115,000,000.0

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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