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Cash and Cash Equivalents	9 Months Ended
Cash and Cash Equivalents	Sep. 30, 2019
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents At September 30, 2019 and December 31, 2018, TCF Bank was required by Federal Reserve regulations to maintain reserves of $149.6 million and $106.2 million, respectively, in cash on hand or at the Federal Reserve Bank. TCF 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. TCF may also retain cash balances for collateral on certain borrowings and derivatives. TCF maintained restricted cash totaling $72.7 million and $38.3 million at September 30, 2019 and December 31, 2018, respectively.