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Securities Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2022	Mar. 31, 2020	Sep. 30, 2018	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities transferred to Held-to-Maturity	$ 1,100,000	$ 873,600	$ 179,800	$ 0	$ 1,059,737
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				163,800
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss				288,192		$ 325,426
Debt Securities, Available-for-sale, Unrealized Loss Position				2,725,194		$ 3,007,832
Sales				173,477	2,866
Debt Securities, Available-for-Sale, Realized Gain				13
Debt Securities, Available-for-sale, Realized Loss				10,000	$ 61
Securities pledged as collateral
Debt Securities, Available-for-sale [Line Items]
Financial Instruments, Owned, at Fair Value				1,900,000
Securities pledged as collateral
Debt Securities, Available-for-sale [Line Items]
Secured borrowing under agreement to repurchase				$ 163,800

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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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The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

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