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Borrowings - FHLB and FRB Advances (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
FRB PPP Liquidity Facility advances	$ 3,865,865	$ 4,415,016
Total long-term debt	$ 3,865,865	$ 4,415,016
FRB PPP Liquidity Facility advances, interest rate	0.35%	0.35%
Total maximum borrowing capacity with the FHLB	$ 2,387,172	$ 2,729,516
Total maximum borrowing capacity with the FRB	197,894	223,299
Qualifying loans serving as collateral against FHLB and FRB advances	3,156,850	3,363,364
FRB PPP liquidity facility	3,865,865	$ 4,415,016
Credit Facility, CARES Act
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 6,300,000

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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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