Allowance for Credit Losses - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) loan	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) loan	Sep. 30, 2022 USD ($) loan	Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest related to financial assets held at amortized cost	$ 290,900,000	$ 158,500,000	$ 290,900,000	$ 158,500,000	$ 158,500,000	$ 214,000,000
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	Accrued interest receivable and other
Nonaccrual loans with no related allowance for credit losses	$ 28,200,000		$ 28,200,000
Provision for credit losses	19,948,000	$ 6,193,000	71,589,000	$ 30,711,000
Loan net charge-offs	(8,100,000)		(30,600,000)
Provision for credit losses	(25,000)		(107,000)
Foreclosed residential real estate properties	441,000		441,000
TDRs, count | loan		7		36	56
TDRs, balance		$ 708,000		$ 6,226,000	$ 13,212,000
Weighted average extension term		42 months
Weighted average decrease in stated interest rate		1.05%
Loan forgiveness		$ 0
Financing Receivable | Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded investment, foreclosure proceedings in process	$ 55,100,000	$ 73,100,000	$ 55,100,000	$ 73,100,000	$ 73,100,000