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Borrowings - FHLB and FRB Advances (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
FRB PPP Liquidity Facility advances	$ 0	$ 4,415,016
Total long-term debt	$ 0	$ 4,415,016
FRB PPP Liquidity Facility advances, interest rate	0.00%	0.35%
Total maximum borrowing capacity with the FHLB	$ 2,789,580	$ 2,729,516
Total maximum borrowing capacity with the FRB	186,841	223,299
Qualifying loans serving as collateral against FHLB and FRB advances	3,613,109	3,363,364
FRB PPP liquidity facility	$ 0	$ 4,415,016

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The sum of the carrying amounts, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and for which the transferees are not permitted to sell or re-pledge them to an unrelated party.

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