Loans and Allowance for Loan Losses - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) contract	Dec. 31, 2021 USD ($) contract	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, impaired, interest lost on nonaccrual loans	$ 23,000,000	$ 9,000,000
Cash-basis interest income recognized	19,800,000	3,000,000
Loans	$ 43,404,490,000	43,716,353,000
Land held for future development, period	1 year
Financing receivable, allowance for credit loss	$ 479,385,000	443,424,000	$ 427,597,000	$ 605,736,000
Reserve for unfunded commitments	57,200,000	57,500,000
All financing receivable, allowance for credit loss	536,600,000	500,900,000
ACL increase	$ 35,700,000
ACL to loans ratio	1.24%
Increase in ACL to loans ratio	0.0009
Allowance for credit loss, reasonable and supportable forecast period	2 years
Allowance for credit loss, straight-line basis historical period	1 year
Modifications, post-modification recorded investment		131,186,000	48,932,000
Commitments to lend additional funds to TDRs		0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-off of previously established reserves for credit losses associated with the transfer to held for sale	$ 31,300,000
Reclassification to held-for-sale	1,590,000,000
Financing receivable, allowance for credit loss	$ 126,657,000	$ 138,299,000	$ 141,473,000	$ 245,439,000
Troubled Debt Restructuring That Subsequently Defaulted
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subsequent default, number of contracts | contract		5	8
Modifications, post-modification recorded investment		$ 1,000,000	$ 978,000
Baseline
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated unemployment rate	4.50%
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retail loan substandard period (in days)	90 days
Loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retail loan charge off (in days)	120 days
Commercial & Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 22,598,493,000	22,066,656,000
Modifications, post-modification recorded investment		105,610,000	$ 27,618,000
Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 24,310,000,000	$ 16,090,000,000.00