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Restrictions on Cash and Cash Equivalents	3 Months Ended
Restrictions on Cash and Cash Equivalents	Mar. 31, 2020
Cash and Cash Equivalents [Abstract]
Restrictions on Cash and Cash Equivalents	Restrictions on Cash and Cash Equivalents The Bank is required to maintain reserves against its deposit liabilities. Prior to March 2020, reserves were in the form of cash and balances with the FRB, included in "interest-bearing deposits with other banks." The FRB suspended cash reserve requirements effective March 26, 2020. The amount of such reserves as of December 31, 2019 was $218.9 million. In addition, collateral is posted by the Corporation with counterparties to secure derivative and other contracts, which is included in "interest-bearing deposits with other banks" on the consolidated balance sheets. The amounts of such collateral as of March 31, 2020 and December 31, 2019 were $452.9 million and $199.6 million, respectively.