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Securities Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2022	Mar. 31, 2020	Sep. 30, 2018	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities transferred to Held-to-Maturity			$ 1,100,000	$ 873,600	$ 179,800
Unrealized after tax gain (loss) on available for sale securities transferred to the held to maturity portfolio			$ 1,500	$ 69,000	$ (2,200)
Secured borrowing under agreement to repurchase	$ 264,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	222,461					$ 221,614
Debt Securities, Available-for-sale, Unrealized Loss Position	4,482,239					$ 4,343,563
Sales	188,486	$ 0
Debt Securities, Available-for-Sale, Realized Gain	42
Debt Securities, Available-for-sale, Realized Loss	12,600
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0
Securities pledged as collateral
Debt Securities, Available-for-sale [Line Items]
Financial Instruments, Owned, at Fair Value	3,500,000
Securities pledged as collateral
Debt Securities, Available-for-sale [Line Items]
Secured borrowing under agreement to repurchase	$ 264,000

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