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Securities Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2022	Mar. 31, 2020	Sep. 30, 2018	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
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	$ 210,000					$ 210,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	195,727					195,727		$ 258,224
Debt Securities, Available-for-sale, Unrealized Loss Position	3,667,441					3,667,441		$ 3,265,473
Sales	0	$ 129,600				822,741	$ 303,145
Debt Securities, Available-for-Sale, Realized Gain	0	289				86	302
Debt Securities, Available-for-sale, Realized Loss	0	$ 10,000				72,200	$ 20,000
Securities pledged as collateral
Debt Securities, Available-for-sale [Line Items]
Financial Instruments, Owned, at Fair Value	2,800,000					2,800,000
Securities pledged as collateral
Debt Securities, Available-for-sale [Line Items]
Secured borrowing under agreement to repurchase	$ 210,000					$ 210,000

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The amount of available-for-sale securities transferred to the held-to-maturity portfolio during the period, a non-cash item.

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