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Cash and Due from Banks	12 Months Ended
Cash and Due from Banks	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Cash and Due from Banks	Cash and Due from Banks At December 31, 2018 and 2017, TCF Bank was required by Federal Reserve regulations to maintain reserves of $106.2 million and $107.0 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, forward foreign exchange contracts, interest rate contracts and other contracts. TCF maintained restricted cash totaling $38.3 million and $36.5 million at December 31, 2018 and 2017, respectively. TCF had cash held in interest-bearing accounts of $307.8 million and $324.2 million at December 31, 2018 and 2017, respectively.