Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest related to financial assets held at amortized cost	$ 297,200	$ 267,300	$ 297,200	$ 267,300	$ 304,500
Financial Asset, Amortized Cost, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable and other	Accrued interest receivable and other	Accrued interest receivable and other	Accrued interest receivable and other	Accrued interest receivable and other
Nonaccrual loans with no related allowance for credit losses	$ 46,600		$ 46,600
Provision for credit losses	39,899	$ 28,571	61,590	$ 51,641
Loan net charge-offs	30,000		51,700
Provision for credit losses	162		144
Foreclosed residential real estate properties	161		161
Commitments to lend	5,100	43,500	5,100	43,500
Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for credit losses	16	(798)	136	(645)
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for credit losses	(4,913)	812	(4,309)	1,349
Premium finance receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for credit losses	7,258	813	12,961	5,420
Financing Receivable | Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded investment, foreclosure proceedings in process	$ 43,800	$ 50,400	$ 43,800	$ 50,400