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Borrowings - Narrative (Details)	9 Months Ended
	Sep. 30, 2022 USD ($) security	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Percent of assets	25.00%
Maximum borrowing capacity	$ 4,520,000,000		$ 4,450,000,000
Percent outstanding advances	100.00%
FHLB and FRB borrowings	$ 700,000,000		300,000,000
Proceeds from FHLB advances	23,650,885,000	$ 1,540,000,000
FHLB and FRB borrowings	1,072,000,000		300,000,000
Other Borrowings	0		0
Remaining borrowing capacity	3,810,000,000
FHLB Advances
Debt Instrument [Line Items]
Loans pledged as collateral	$ 0		$ 0
Weighted Average
Debt Instrument [Line Items]
FHLB advances, interest rate	3.04%		0.92%
Minimum
Debt Instrument [Line Items]
FHLB advances, interest rate	2.39%
Maximum
Debt Instrument [Line Items]
FHLB advances, interest rate	3.22%
Qualifying Loans
Debt Instrument [Line Items]
Asset balance used to determine maximum borrowing capacity from federal reserve bank	$ 923,200,000
FRB Discount Window
Debt Instrument [Line Items]
Advances from Federal Reserve Bank	$ 372,000,000		$ 0
Percent of qualifying assets (up to)	99.00%
Number of securities pledged as collateral | security	1
Securities pledged as collateral	$ 1,100,000
Total available borrowing capacity	$ 420,600,000		606,600,000
Interest rate at period end	3.25%
Unsecured Credit Facility with FHLB
Debt Instrument [Line Items]
Unsecured credit facility, maximum borrowing capacity	$ 81,200,000		81,200,000
Mortgage Loans on Real Estate
Debt Instrument [Line Items]
Pledged as collateral, FHLB	$ 7,850,000,000		$ 6,960,000,000

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Amount of restricted 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 the collateral pledged in support of federal home loan bank advances outstanding.

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States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

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Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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