Litigation Contingencies	12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Litigation Contingencies	Litigation Contingencies From time to time TCF is a party to legal proceedings arising out of its lending, leasing and deposit operations, including foreclosure proceedings and other collection actions as part of its lending and leasing collections activities. TCF may also be subject to regulatory examinations and enforcement actions brought by federal regulators, including the Securities and Exchange Commission, the Federal Reserve, the OCC and the Consumer Financial Protection Bureau (the "CFPB") which may impose sanctions on TCF for failures related to regulatory compliance. From time to time borrowers and other customers, and employees and former employees have also brought actions against TCF, in some cases claiming substantial damages. TCF and other financial services companies are subject to the risk of class action litigation. Litigation is often unpredictable and the actual results of litigation cannot be determined and therefore the ultimate resolution of a matter and the possible range of loss associated with certain potential outcomes cannot be established. Based on our current understanding of TCF's pending legal proceedings, management does not believe that judgments or settlements arising from pending or threatened legal matters, individually or in the aggregate, would have a material adverse effect on the consolidated financial position, operating results or cash flows of TCF. On January 19, 2017, the CFPB filed a civil lawsuit against TCF Bank in the United States District Court for the District of Minnesota (the "Court"), captioned Consumer Financial Protection Bureau v. TCF National Bank, alleging violations of the Consumer Financial Protection Act (the "CFPA") and Regulation E, §1005.17 in connection with TCF Bank's practices administering checking account overdraft program "opt-in" requirements from 2010 to early 2014. On September 8, 2017, the Court issued a ruling on the motion made by TCF Bank to dismiss the complaint of the CFPB. In its ruling, the Court granted TCF Bank's motion to dismiss the CFPB's Regulation E claims and also dismissed the CFPB's unfair, deceptive and abusive conduct claims under the CFPA for periods prior to July 21, 2011. On July 20, 2018, TCF Bank entered into a Stipulated Final Judgment and Order (the "CFPB Settlement") with the CFPB to resolve the matter and has entered into a Consent Order and a Consent Order For a Civil Money Penalty and related stipulations (collectively, the "OCC Consent Orders") with the OCC to resolve related regulatory issues with the OCC (collectively, the CFPB Settlement and the OCC Consent Orders are referred to herein as the "Consent Agreements"). The Consent Agreements provide, among other things, for TCF Bank to submit a restitution plan to the CFPB and OCC pursuant to which TCF Bank will pay restitution in the total amount of $25.0 million to certain current and former customers and require a notice to certain customers opted-in to overdraft service reminding them of their current opt-in choice. TCF is working toward completion of the restitution plan and expects to satisfy all the requirements in a timely fashion and in accordance with the terms of the CFPB Settlement and the restitution plan. Pursuant to the Consent Agreements, TCF Bank paid $5.0 million in civil money penalties, $3.0 million of which was paid to the OCC and $2.0 million of which was paid to the CFPB. In addition, TCF Bank expects to incur approximately $2.0 million in administrative costs related to the administration of the restitution plan required under the Consent Agreements.

Litigation Contingencies

From time to time TCF is a party to legal proceedings arising out of its lending, leasing and deposit operations, including foreclosure proceedings and other collection actions as part of its lending and leasing collections activities. TCF may also be subject to regulatory examinations and enforcement actions brought by federal regulators, including the Securities and Exchange Commission, the Federal Reserve, the OCC and the Consumer Financial Protection Bureau (the "CFPB") which may impose sanctions on TCF for failures related to regulatory compliance. From time to time borrowers and other customers, and employees and former employees have also brought actions against TCF, in some cases claiming substantial damages. TCF and other financial services companies are subject to the risk of class action litigation. Litigation is often unpredictable and the actual results of litigation cannot be determined and therefore the ultimate resolution of a matter and the possible range of loss associated with certain potential outcomes cannot be established. Based on our current understanding of TCF's pending legal proceedings, management does not believe that judgments or settlements arising from pending or threatened legal matters, individually or in the aggregate, would have a material adverse effect on the consolidated financial position, operating results or cash flows of TCF.

On January 19, 2017, the CFPB filed a civil lawsuit against TCF Bank in the United States District Court for the District of Minnesota (the "Court"), captioned Consumer Financial Protection Bureau v. TCF National Bank, alleging violations of the Consumer Financial Protection Act (the "CFPA") and Regulation E, §1005.17 in connection with TCF Bank's practices administering checking account overdraft program "opt-in" requirements from 2010 to early 2014. On September 8, 2017, the Court issued a ruling on the motion made by TCF Bank to dismiss the complaint of the CFPB. In its ruling, the Court granted TCF Bank's motion to dismiss the CFPB's Regulation E claims and also dismissed the CFPB's unfair, deceptive and abusive conduct claims under the CFPA for periods prior to July 21, 2011. On July 20, 2018, TCF Bank entered into a Stipulated Final Judgment and Order (the "CFPB Settlement") with the CFPB to resolve the matter and has entered into a Consent Order and a Consent Order For a Civil Money Penalty and related stipulations (collectively, the "OCC Consent Orders") with the OCC to resolve related regulatory issues with the OCC (collectively, the CFPB Settlement and the OCC Consent Orders are referred to herein as the "Consent Agreements"). The Consent Agreements provide, among other things, for TCF Bank to submit a restitution plan to the CFPB and OCC pursuant to which TCF Bank will pay restitution in the total amount of $25.0 million to certain current and former customers and require a notice to certain customers opted-in to overdraft service reminding them of their current opt-in choice. TCF is working toward completion of the restitution plan and expects to satisfy all the requirements in a timely fashion and in accordance with the terms of the CFPB Settlement and the restitution plan. Pursuant to the Consent Agreements, TCF Bank paid $5.0 million in civil money penalties, $3.0 million of which was paid to the OCC and $2.0 million of which was paid to the CFPB. In addition, TCF Bank expects to incur approximately $2.0 million in administrative costs related to the administration of the restitution plan required under the Consent Agreements.