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Cash and Cash Equivalents	9 Months Ended
Cash and Cash Equivalents	Sep. 30, 2020
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 $1.8 billion and $1.2 billion at September 30, 2020 and December 31, 2019, respectively. As of March 26, 2020, TCF Bank was no longer required by Federal Reserve regulations to maintain reserves in cash on hand or at the Federal Reserve Bank. 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 $103.9 million and $68.6 million at September 30, 2020 and December 31, 2019, respectively.