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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 Cash and cash equivalents include cash and due from banks and interest-bearing deposits in other banks. At December 31, 2019 and 2018, TCF Bank was required by Federal Reserve regulations to maintain reserves of $177.0 million and $106.2 million, respectively, in cash on hand or at the Federal Reserve Bank. We maintain 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. We may also retain cash balances for collateral on certain borrowings and derivative contracts. We maintained restricted cash totaling $68.6 million and $38.3 million at December 31, 2019 and 2018, respectively.