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Cash and Cash Equivalents	3 Months Ended
Cash and Cash Equivalents	Mar. 31, 2021
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash and due from banks and interest-bearing deposits in other banks. Total cash and cash equivalents were $1.0 billion and $1.3 billion at March 31, 2021 and December 31, 2020, respectively. The Corporation maintains cash balances that are restricted as to their use in accordance with certain obligations. Cash payments received on loans serviced for third parties are generally held in separate accounts until remitted. The Corporation may also retain cash balances for collateral on certain borrowings and derivatives. The Corporation maintained restricted cash totaling $95.5 million and $95.1 million at March 31, 2021 and December 31, 2020, respectively.