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Securities Securities - Narrative (Details) - USD ($)	3 Months Ended			9 Months Ended
	Mar. 31, 2022	Mar. 31, 2020	Sep. 30, 2018	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities transferred to Held-to-Maturity	$ 1,100,000,000	$ 873,600,000	$ 179,800,000	$ 1,059,737,000	$ 0
Unrealized after tax gain (loss) on available for sale securities transferred to the held to maturity portfolio	$ (1,500,000)	$ 69,000,000	$ (2,200,000)
Secured borrowing under agreement to repurchase				190,600,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss				387,360,000		$ 32,686,000
Debt Securities, Available-for-sale, Unrealized Loss Position				3,305,070,000		$ 2,117,777,000
Sales				29,501,000	2,240,000
Debt Securities, Available-for-sale, Realized Loss				136,000
Debt Securities, Available-for-Sale, Realized Gain				292,000	$ 366,000
Securities pledged as collateral
Debt Securities, Available-for-sale [Line Items]
Financial Instruments, Owned, at Fair Value				666,400,000
Securities pledged as collateral
Debt Securities, Available-for-sale [Line Items]
Secured borrowing under agreement to repurchase				$ 190,600,000

X

- Definition

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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Unrealized after tax gain (loss) on available for sale securities transferred to the held to maturity portfolio

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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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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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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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Amount, before effects of master netting arrangements, of securities loaned to entities in exchange for collateral and funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement.

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