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Cash and Cash Equivalents	12 Months Ended
Cash and Cash Equivalents	Dec. 31, 2019
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents As of December 31, 2019, cash and cash equivalents include cash due from the FRB of $5.5 billion and cash due from depository institutions of $93 million. As of December 31, 2018, cash and cash equivalents include cash due from the FRB of $2.5 billion and cash due from depository institutions of $62 million. As of December 31, 2019 and 2018, we had no outstanding cash equivalents. The FRB Term Deposit Facility program is used to facilitate the conduct of monetary policy by providing a tool that may be used to manage the aggregate quantity of reserve balances held by depository institutions. Under this program, the FRB accepts deposits for a stated maturity at a rate of interest determined via auction. The funds are removed from the accounts of participating institutions for the life of the term deposit. We participated in these auctions in 2019 and 2018, resulting in interest income of $0.3 million and $0.2 million, respectively. As of December 31, 2019 and 2018, no funds were on deposit with the FRB under this program.