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Regulatory Capital - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 01, 2020	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest		$ 1,526,104	$ 1,413,621	$ 1,526,104	$ 1,413,621		$ 1,435,920	$ 1,269,652	$ 1,339,772
Off-Balance-Sheet, Credit Loss, Liability		97,877	91,959	97,877	91,959	$ 52,541	84,568	$ 49,479	$ 112,962
Retained earnings		4,531,160		4,531,160			$ 4,114,446
Dividends		$ 100,000	$ 116,000	$ 294,000	$ 414,000
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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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