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Regulatory Capital - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Jan. 01, 2020	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest		$ 1,469,509		$ 1,269,652	$ 1,469,509	$ 1,269,652	$ 1,435,920	$ 1,350,058	$ 1,339,772
Off-Balance-Sheet, Credit Loss, Liability		52,541	$ 23,890	49,479	52,541	49,479	84,568	$ 32,034	$ 112,962
Retained earnings		4,426,222			4,426,222		$ 4,114,446
Unrealized gain (loss)			(83,000)		(69,000)
Unrealized loss, tax benefit			$ 27,000		23,000
Dividends		$ 94,000		$ 138,000	$ 194,000	$ 298,000
Adjustments
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Period of deferment	2 years
Percentage amount deferred per year	25.00%
Percentage amount phased in during year	25.00%
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 1,100,000
Off-Balance-Sheet, Credit Loss, Liability	116,000
Deferred Tax Assets, Net	306,000
Retained earnings	$ 953,000

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