TCF Financial 10-Q 3 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 27, 2018
Document and Entity Information
Entity Registrant Name	TCF FINANCIAL CORP
Entity Central Index Key	814,184
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		168,253,445

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets:
Cash and due from banks	$ 588,893	$ 621,782
Investments	91,661	82,644
Debt securities held to maturity	158,099	161,576
Debt securities available for sale	1,954,246	1,709,018
Loans and leases held for sale	50,706	134,862
Consumer real estate:
First mortgage lien	1,878,441	1,959,387
Junior lien	2,843,221	2,860,309
Total consumer real estate	4,721,662	4,819,696
Commercial	3,678,181	3,561,193
Leasing and equipment finance	4,666,239	4,761,661
Inventory finance	3,457,855	2,739,754
Auto finance	2,839,363	3,199,639
Other	19,854	22,517
Total loans and leases	19,383,154	19,104,460
Allowance for loan and lease losses	(167,703)	(171,041)
Net loans and leases	19,215,451	18,933,419
Premises and equipment, net	427,497	421,549
Goodwill, net	154,757	154,757
Other assets	743,742	782,552
Total assets	23,385,052	23,002,159
Deposits:
Checking	6,541,409	6,300,127
Savings	5,551,155	5,287,606
Money market	1,609,472	1,764,998
Certificates of deposit	4,995,636	4,982,271
Total deposits	18,697,672	18,335,002
Short-term borrowings	775	0
Long-term borrowings	1,457,976	1,249,449
Total borrowings	1,458,751	1,249,449
Accrued expenses and other liabilities	677,679	737,124
Total liabilities	20,834,102	20,321,575
Equity:
Preferred stock, par value $0.01 per share, 30,000,000 shares authorized; 7,000 and 4,007,000 shares issued, respectively	169,302	265,821
Common stock, par value $0.01 per share, 280,000,000 shares authorized; 172,472,035 and 172,158,449 shares issued, respectively	1,725	1,722
Additional paid-in capital	878,096	877,217
Retained earnings, subject to certain restrictions	1,618,041	1,577,311
Accumulated other comprehensive income (loss)	(46,851)	(18,517)
Treasury stock at cost, 3,056,201 and 489,030 shares, respectively and other	(97,800)	(40,797)
Total TCF Financial Corporation stockholders' equity	2,522,513	2,662,757
Non-controlling interest in subsidiaries	28,437	17,827
Total equity	2,550,950	2,680,584
Total liabilities and equity	$ 23,385,052	$ 23,002,159

Consolidated Statements of Fin3

Consolidated Statements of Financial Condition (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	30,000,000	30,000,000
Preferred stock, shares issued (shares)	7,000	4,007,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	280,000,000	280,000,000
Common stock, shares issued (shares)	172,472,035	172,158,449
Treasury stock, shares (shares)	3,056,201	489,030

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income:
Loans and leases	$ 260,375	$ 219,548
Debt securities available for sale	10,123	7,980
Debt securities held to maturity	1,019	1,280
Loans held for sale and other	3,745	13,499
Total interest income	275,262	242,307
Interest expense:
Deposits	22,510	13,715
Borrowings	9,553	6,478
Total interest expense	32,063	20,193
Net interest income	243,199	222,114
Provision for credit losses	11,368	12,193
Net interest income after provision for credit losses	231,831	209,921
Non-interest income:
Fees and service charges	30,751	31,282
Card revenue	13,759	13,150
ATM revenue	4,650	4,675
Subtotal	49,160	49,107
Gains on sales of auto loans, net	0	2,864
Gains on sales of consumer real estate loans, net	9,123	8,891
Servicing fee income	8,295	11,651
Subtotal	17,418	23,406
Leasing and equipment finance	41,847	28,298
Other	3,716	2,703
Fees and other revenue	112,141	103,514
Gains (losses) on debt securities, net	63	0
Total non-interest income	112,204	103,514
Non-interest expense:
Compensation and employee benefits	123,840	124,298
Occupancy and equipment	40,514	39,600
Other	58,819	64,216
Subtotal	223,173	228,114
Operating lease depreciation	17,274	11,242
Foreclosed real estate and repossessed assets, net	4,916	4,549
Other credit costs, net	617	101
Total non-interest expense	245,980	244,006
Income before income tax expense	98,055	69,429
Income tax expense	21,631	20,843
Income after income tax expense	76,424	48,586
Income attributable to non-controlling interest	2,663	2,308
Net income attributable to TCF Financial Corporation	73,761	46,278
Preferred stock dividends	4,106	4,847
Impact of preferred stock redemption	3,481	0
Net income available to common stockholders	$ 66,174	$ 41,431
Net income per common share:
Basic (in dollars per share)	$ 0.39	$ 0.25
Diluted (in dollars per share)	$ 0.39	$ 0.25

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income attributable to TCF Financial Corporation	$ 73,761	$ 46,278
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on debt securities available for sale and interest-only strips	(27,819)	2,769
Net unrealized gains (losses) on net investment hedges	1,604	(313)
Foreign currency translation adjustments	(2,110)	581
Recognized postretirement prior service cost	(9)	(7)
Total other comprehensive income (loss), net of tax	(28,334)	3,030
Comprehensive income	$ 45,427	$ 49,308

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	TCF Financial Corporation	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock and Other	Non-controlling Interest
Increase (Decrease) in Equity
Change in accounting principle	$ 0	$ 0			$ 1,319	$ (1,319)
Adjusted balance after cumulative adjustment related to change in accounting principle	2,444,645	2,427,483	$ 263,240	$ 1,710	864,095	1,381,582	$ (33,725)	$ (49,419)	$ 17,162
Balance (in shares) at Dec. 31, 2016			4,006,900	171,034,506
Balance at Dec. 31, 2016	2,444,645	2,427,483	$ 263,240	$ 1,710	862,776	1,382,901	(33,725)	(49,419)	17,162
Increase (Decrease) in Equity
Net income	48,586	46,278				46,278			2,308
Other comprehensive income (loss), net of tax	3,030	3,030					3,030
Net investment by (distribution to) non-controlling interest	$ 7,081								7,081
Repurchase of 2,567,171 shares of common stock (in shares)	0
Dividends on preferred stock	$ (4,847)	(4,847)				(4,847)
Dividends on common stock	(12,595)	(12,595)				(12,595)
Common shares purchased by TCF employee benefit plans (in shares)				366,591
Common shares purchased by TCF employee benefit plans	6,446	6,446		$ 4	6,442
Stock compensation plans, net of tax (in shares)				(417,269)
Stock compensation plans, net of tax	(1,683)	(1,683)		$ (4)	(1,679)
Change in shares held in trust for deferred compensation plans, at cost					(15,834)			15,834
Balance (in shares) at Mar. 31, 2017			4,006,900	170,983,828
Balance at Mar. 31, 2017	2,490,663	2,464,112	$ 263,240	$ 1,710	853,024	1,410,418	(30,695)	(33,585)	26,551
Increase (Decrease) in Equity
Change in accounting principle	(116)	(116)				(116)
Adjusted balance after cumulative adjustment related to change in accounting principle	2,680,468	2,662,641	$ 265,821	$ 1,722	877,217	1,577,195	(18,517)	(40,797)	17,827
Balance (in shares) at Dec. 31, 2017			4,007,000	172,158,449
Balance at Dec. 31, 2017	2,680,584	2,662,757	$ 265,821	$ 1,722	877,217	1,577,311	(18,517)	(40,797)	17,827
Increase (Decrease) in Equity
Net income	76,424	73,761				73,761			2,663
Other comprehensive income (loss), net of tax	(28,334)	(28,334)					(28,334)
Net investment by (distribution to) non-controlling interest	7,947								7,947
Redemption of Series B Preferred Stock (in shares)			(4,000,000)
Redemption of Series B Preferred Stock	$ (100,000)	(100,000)	$ (96,519)			(3,481)
Repurchase of 2,567,171 shares of common stock (in shares)	2,567,171
Repurchase of 2,567,171 shares of common stock	$ (57,673)	(57,673)						(57,673)
Dividends on preferred stock	(4,106)	(4,106)				(4,106)
Dividends on common stock	$ (25,328)	(25,328)				(25,328)
Common stock warrants exercised (in shares)	1,196
Common shares purchased by TCF employee benefit plans (in shares)				34,627
Common shares purchased by TCF employee benefit plans	$ 715	715		$ 0	715
Stock compensation plans, net of tax (in shares)				277,763
Stock compensation plans, net of tax	837	837		$ 3	834
Change in shares held in trust for deferred compensation plans, at cost					(670)			670
Balance (in shares) at Mar. 31, 2018			7,000	172,472,035
Balance at Mar. 31, 2018	$ 2,550,950	$ 2,522,513	$ 169,302	$ 1,725	$ 878,096	$ 1,618,041	$ (46,851)	$ (97,800)	$ 28,437

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 76,424	$ 48,586
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	11,368	12,193
Depreciation and amortization	56,606	45,465
Provision for deferred income taxes	879	(12,032)
Proceeds from sales of loans and leases held for sale	69,342	61,287
Originations of loans and leases held for sale, net of repayments	(73,872)	(232,556)
Gains on sales of assets, net	(10,556)	(14,741)
Net change in other assets and accrued expenses and other liabilities	(1,965)	(39,398)
Other, net	(11,313)	(10,967)
Net cash provided by (used in) operating activities	116,913	(142,163)
Cash flows from investing activities:
Proceeds from maturities of and principal collected on debt securities	32,533	33,361
Purchases of debt securities	(320,722)	(86,841)
Redemption of Federal Home Loan Bank stock	56,000	78,000
Purchases of Federal Home Loan Bank stock	(65,000)	(85,000)
Proceeds from sales of loans and leases	240,934	611,515
Loan and lease originations and purchases, net of principal collected on loans and leases	(234,229)	(734,954)
Proceeds from sales of lease equipment	3,670	2,242
Purchases of lease equipment	(254,553)	(223,786)
Proceeds from sales of real estate owned	8,203	15,711
Purchases of premises and equipment	(18,085)	(9,597)
Other, net	7,451	7,965
Net cash provided by (used in) investing activities	(543,798)	(391,384)
Cash flows from financing activities:
Net change in deposits	357,224	227,133
Net change in short-term borrowings	841	990
Proceeds from long-term borrowings	2,355,602	3,610,415
Payments on long-term borrowings	(2,143,531)	(3,442,038)
Redemption of Series B preferred stock	(100,000)	0
Repurchases of common stock	(54,371)	0
Common shares sold to TCF employee benefit plans	715	6,446
Dividends paid on preferred stock	(4,106)	(4,847)
Dividends paid on common stock	(25,328)	(12,595)
Exercise of stock options	(997)	(57)
Net investment by (distribution to) non-controlling interest	7,947	7,081
Net cash provided by (used in) financing activities	393,996	392,528
Net change in cash and due from banks	(32,889)	(141,019)
Cash and due from banks at beginning of period	621,782	609,603
Cash and due from banks at end of period	588,893	468,584
Cash paid (received) for:
Interest on deposits and borrowings	29,857	18,726
Income taxes, net	(28,064)	18,835
Transfer of loans and leases to other assets	26,044	22,182
Transfer of loans and leases from held for investment to held for sale, net	$ 150,357	$ 778,432

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation TCF Financial Corporation (together with its direct and indirect subsidiaries, "we," "us," "our," "TCF" or the "Company"), a Delaware corporation, is a national bank holding company based in Wayzata, Minnesota. References herein to "TCF Financial" or the "Holding Company" refer to TCF Financial Corporation on an unconsolidated basis. Its principal subsidiary, TCF National Bank ("TCF Bank"), is headquartered in Sioux Falls, South Dakota. TCF Bank operates bank branches in Illinois, Minnesota, Michigan, Colorado, Wisconsin, Arizona and South Dakota (TCF's primary banking markets). Through its direct subsidiaries, TCF Bank provides a full range of consumer facing and commercial services, including providing consumer banking services, commercial banking services, commercial leasing and equipment financing and commercial inventory financing. The accompanying unaudited consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles ("GAAP") for interim financial information and in accordance with the instructions to Quarterly Report on Form 10-Q and Article 10 of Regulation S-X as promulgated by the Securities and Exchange Commission. Accordingly, the consolidated financial statements do not include all of the information and notes necessary for complete financial statements in conformity with GAAP. The information in this Quarterly Report on Form 10-Q is written with the presumption that the users of the interim financial statements have read or have access to the Company's most recent Annual Report on Form 10-K, which contains the latest audited financial statements and notes thereto, together with Management's Discussion and Analysis of Financial Condition and Results of Operations at December 31, 2017 , and for the year then ended. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain reclassifications have been made to prior period financial statements to conform to current period presentation. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. These estimates are based on information available to management at the time the estimates are made. Actual results could differ from those estimates. In the opinion of management, the accompanying unaudited consolidated financial statements contain all the significant adjustments, consisting of normal recurring items, considered necessary for fair presentation. The results of operations for interim periods are not necessarily indicative of the results to be expected for the entire year.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Accounting policies in effect at December 31, 2017 remain significantly unchanged and have been followed similarly as in previous periods. New Accounting Pronouncements Adopted Effective January 1, 2018, the Company adopted Accounting Standards Update ("ASU") No. 2017-12: Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities , which expands hedge accounting for nonfinancial and financial risk components and amends measurement methodologies to more closely align hedge accounting with a company’s risk management activities. The ASU decreases the complexity of preparing and understanding hedge results through measurement and reporting of hedge ineffectiveness. In addition, disclosures have been enhanced and the presentation of hedged results changed to align the effects of the hedging instrument and the hedged item. The adoption of this ASU was on a modified retrospective basis and resulted in the Company recording a cumulative effect reduction to the opening balance of retained earnings of $116 thousand . Effective January 1, 2018, the Company adopted ASU No. 2017-09: Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting , which provides guidance about which changes to the terms and conditions of a share-based payment award requires an entity to apply modification accounting in Topic 718. The adoption of this ASU was on a prospective basis and will be applicable to an award modified on or after January 1, 2018. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2017-07: Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost , which changes how employers that sponsor defined benefit pension and/or other postretirement benefit plans present the net periodic benefit cost in the income statement. Under the new guidance, employers present the service cost component of the net periodic benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. Only the service cost component is eligible for capitalization in assets. The other components of net periodic benefit cost are presented separately from the line item that includes service cost and outside of any subtotal of operating income. In addition, disclosure of the line items used to present the other components of net periodic benefit cost is required if the components are not presented separately in the income statement. The adoption of this ASU was on a modified retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2017-05: Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets , which provides guidance for recognizing gains and losses from the transfer of nonfinancial assets in contracts with non-customers. The ASU also clarifies that Accounting Standards Codification 610-20 applies to the derecognition of nonfinancial assets and in substance nonfinancial assets unless other specific guidance applies or the sale is to a customer. The guidance does not apply to the derecognition of businesses, nonprofit activities, financial assets, including equity method investments, or to revenue contracts with customers. The adoption of this ASU was on a modified retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business , which clarifies the definition of a business with the objective of adding guidance to assist companies with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The ASU provides a more robust framework to use in determining when a set of assets and activities is a business. The adoption of this ASU was on a prospective basis. TCF will evaluate future transactions to determine if they should be accounted for as acquisitions (or disposals) of assets or businesses. Effective January 1, 2018, the Company adopted ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash , which requires entities to show changes in the total of cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. As a result, entities no longer present transfers between cash and cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. The adoption of this ASU was on a retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2016-17, Consolidation (Topic 810): Interests Held through Related Parties That Are under Common Control , which changes the way in which a single decision maker considers indirect interests when performing the primary beneficiary analysis under the variable interest model. Under the amended guidance, indirect interests held by a related party would be considered on a proportional basis. The adoption of this ASU was on a retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory , which requires the income tax effects of intercompany sales and transfers of assets, other than inventory, to be recognized in the period the transaction occurs. The adoption of this ASU was on a modified retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments , which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain types of cash receipts and cash payments are presented in the statement of cash flows. The adoption of this ASU was on a retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2016-04, Liabilities - Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products , which requires issuers of prepaid stored-value products redeemable for goods, services or cash at third-party merchants to derecognize liabilities related to those products for breakage. The adoption of this ASU was on a modified retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities and ASU No. 2018-03, Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , which amend the classification and measurement of investments in equity securities, simplify the impairment analysis of equity investments without readily determinable fair values, require separate presentation of certain fair value changes for financial liabilities measured at fair value and eliminate certain disclosure requirements associated with the fair value of financial instruments. The adoption of these ASUs was on a prospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted the following ASUs using the modified retrospective method with no cumulative-effect adjustment to opening retained earnings: ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606); ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date; ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net); ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing; ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients; ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers; ASU No. 2017-13 , Revenue Recognition (Topic 605), Revenue from Contracts with Customers (Topic 606), Leases (Topic 840), and Leases (Topic 842): Amendments to SEC Paragraphs and ASU No. 2017-14, Income Statement - Reporting Comprehensive Income (Topic 220), Revenue Recognition (Topic 605), and Revenue from Contracts with Customers (Topic 606) . TCF derives a majority of its revenue from loans and leases, as well as any related servicing fee revenue, which are not within the scope of these ASUs. These ASUs are applicable to most of the fees and service charges, card and ATM revenue earned by TCF, as well as the gains on sales of certain non-financial assets. However, the recognition of these revenue streams does not change in a significant manner as a result of the adoption of these ASUs. The majority of this revenue is both charged to the customer and earned either at a point in time or on a transactional basis. As a result, the revenue expected to be recognized in any future year related to remaining performance obligations, contracts where revenue is recognized when invoiced and contracts with variable consideration related to undelivered performance obligations are not material. In addition, receivables related to fees and service charges and the related bad debt expense are not material. There are no material contract assets, contract liabilities or deferred contract costs recorded in the Company's Consolidated Statements of Financial Condition. As a significant majority of the Company's revenue streams are not included in the scope of these ASUs and the recognition of revenue for the revenue streams within the scope of these ASUs are not significantly changed, the adoption of this guidance did not have a material impact on the Company's consolidated financial statements.

Cash and Due from Banks

Cash and Due from Banks	3 Months Ended
	Mar. 31, 2018
Cash and Cash Equivalents [Abstract]
Cash and Due from Banks	Cash and Due from Banks At March 31, 2018 and December 31, 2017 , TCF Bank was required by Federal Reserve regulations to maintain reserves of $112.7 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 contractual agreements primarily related to the servicing of auto finance loans. 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 $35.4 million and $36.5 million at March 31, 2018 and December 31, 2017 , respectively. TCF had cash held in interest-bearing accounts of $326.4 million and $324.2 million at March 31, 2018 and December 31, 2017 , respectively.

Debt Securities Available for S

Debt Securities Available for Sale and Debt Securities Held to Maturity	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Debt Securities Available for Sale and Debt Securities Held to Maturity	Debt Securities Available for Sale and Debt Securities Held to Maturity Debt securities were as follows: At March 31, 2018 At December 31, 2017 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt securities available for sale: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ 1,171,513 $ 553 $ 30,414 $ 1,141,652 $ 908,189 $ 308 $ 13,812 $ 894,685 Other 5 — — 5 6 — — 6 Obligations of states and political subdivisions 830,296 342 18,049 812,589 810,159 7,967 3,799 814,327 Total debt securities available for sale $ 2,001,814 $ 895 $ 48,463 $ 1,954,246 $ 1,718,354 $ 8,275 $ 17,611 $ 1,709,018 Debt securities held to maturity: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ 155,299 $ 1,408 $ 1,011 $ 155,696 $ 158,776 $ 4,462 $ 412 $ 162,826 Other securities 2,800 — — 2,800 2,800 — — 2,800 Total debt securities held to maturity $ 158,099 $ 1,408 $ 1,011 $ 158,496 $ 161,576 $ 4,462 $ 412 $ 165,626 At March 31, 2018 and December 31, 2017 , mortgage-backed securities with a carrying value of $1.1 million and $0.9 million , respectively, were pledged as collateral to secure certain deposits and borrowings. We have assessed each security with unrealized losses included in the table above for credit impairment. As part of that assessment we evaluated and concluded that we do not intend to sell any of the securities and that it is more likely than not that we will not be required to sell prior to recovery of the amortized cost. Unrealized losses on debt securities available for sale and debt securities held to maturity were due to changes in interest rates. There were no sales or impairment charges for debt securities available for sale and debt securities held to maturity during the first quarter of 2018 or 2017 . Net gains (losses) on debt securities were $63 thousand for the first quarter of 2018 related to a recovery on previously impaired debt securities held to maturity. Gross unrealized losses and fair value of debt securities available for sale and debt securities held to maturity aggregated by investment category and the length of time the securities were in a continuous loss position were as follows: At March 31, 2018 Less than 12 months 12 months or more Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Debt securities available for sale: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ 565,752 $ 12,193 $ 406,236 $ 18,221 $ 971,988 $ 30,414 Obligations of states and political subdivisions 528,645 9,266 200,911 8,783 729,556 18,049 Total debt securities available for sale $ 1,094,397 $ 21,459 $ 607,147 $ 27,004 $ 1,701,544 $ 48,463 Debt securities held to maturity: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ 24,530 $ 489 $ 11,576 $ 522 $ 36,106 $ 1,011 Total debt securities held to maturity $ 24,530 $ 489 $ 11,576 $ 522 $ 36,106 $ 1,011 At December 31, 2017 Less than 12 months 12 months or more Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Debt securities available for sale: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ 406,298 $ 2,686 $ 428,585 $ 11,126 $ 834,883 $ 13,812 Obligations of states and political subdivisions 103,759 486 207,516 3,313 311,275 3,799 Total debt securities available for sale $ 510,057 $ 3,172 $ 636,101 $ 14,439 $ 1,146,158 $ 17,611 Debt securities held to maturity: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ 13,309 $ 132 $ 11,470 $ 280 $ 24,779 $ 412 Total debt securities held to maturity $ 13,309 $ 132 $ 11,470 $ 280 $ 24,779 $ 412 The amortized cost and fair value of debt securities available for sale and debt securities held to maturity by final contractual maturity were as follows. The remaining contractual principal maturities do not consider possible prepayments. Remaining expected maturities will differ from contractual maturities because borrowers may have the right to prepay. At March 31, 2018 At December 31, 2017 (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Debt securities available for sale: Due in one year or less $ 5 $ 5 $ 6 $ 6 Due in 1-5 years 29,294 29,201 15,178 15,312 Due in 5-10 years 558,110 547,706 514,336 517,867 Due after 10 years 1,414,405 1,377,334 1,188,834 1,175,833 Total debt securities available for sale $ 2,001,814 $ 1,954,246 $ 1,718,354 $ 1,709,018 Debt securities held to maturity: Due in one year or less $ 1,000 $ 1,000 $ 1,000 $ 1,000 Due in 1-5 years 1,400 1,400 1,400 1,400 Due in 5-10 years 418 421 400 400 Due after 10 years 155,281 155,675 158,776 162,826 Total debt securities held to maturity $ 158,099 $ 158,496 $ 161,576 $ 165,626 Interest income attributable to debt securities available for sale was as follows: Quarter Ended March 31, (In thousands) 2018 2017 Taxable interest income $ 5,813 $ 4,654 Tax-exempt interest income 4,310 3,326 Total interest income $ 10,123 $ 7,980

Loans and Leases

Loans and Leases	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Loans and Leases	Loans and Leases Loans and leases were as follows: (In thousands) At March 31, 2018 At December 31, 2017 Consumer real estate: First mortgage lien $ 1,878,441 $ 1,959,387 Junior lien 2,843,221 2,860,309 Total consumer real estate 4,721,662 4,819,696 Commercial: Commercial real estate: Permanent 2,445,780 2,385,752 Construction and development 363,672 365,533 Total commercial real estate 2,809,452 2,751,285 Commercial business 868,729 809,908 Total commercial 3,678,181 3,561,193 Leasing and equipment finance 4,666,239 4,761,661 Inventory finance 3,457,855 2,739,754 Auto finance 2,839,363 3,199,639 Other 19,854 22,517 Total loans and leases (1) $ 19,383,154 $ 19,104,460 (1) Loans and leases are reported at historical cost including net direct fees and costs associated with originating and acquiring loans and leases, lease residuals, unearned income and unamortized purchase premiums and discounts. The aggregate amount of these loan and lease adjustments was $22.0 million and $33.3 million at March 31, 2018 and December 31, 2017 , respectively. Loan Sales During the first quarter of 2018 and 2017 , TCF sold $266.3 million and $379.4 million , respectively, of consumer real estate loans, received cash of $272.9 million and $399.2 million , respectively, and recognized net gains of $9.1 million and $8.9 million , respectively. Related to these sales, TCF retained interest-only strips of $3.3 million and $1.3 million during the first quarter of 2018 and 2017 , respectively. Included in consumer real estate loans sold in the first quarter of 2017 were $49.4 million of non-accrual loans, which were sold servicing released. TCF generally retains servicing on loans sold. During the first quarter of 2018 , TCF did no t sell any auto finance loans. During the first quarter of 2017 , TCF sold $250.6 million of auto finance loans, received cash of $254.8 million and recognized net gains of $2.9 million . No servicing assets or liabilities related to consumer real estate or auto finance loans were recorded within TCF's Consolidated Statements of Financial Condition, as the contractual servicing fees are adequate to compensate TCF for its servicing responsibilities based on the amount demanded by the marketplace. Total interest-only strips and the contractual liabilities related to loan sales were as follows: (In thousands) At March 31, 2018 At December 31, 2017 Interest-only strips attributable to: Consumer real estate loan sales $ 18,099 $ 16,440 Auto finance loan sales 3,752 4,946 Total interest-only strips $ 21,851 $ 21,386 Contractual liabilities attributable to: Consumer real estate loan sales $ 990 $ 1,234 TCF recorded $268 thousand of impairment charges on the consumer real estate interest-only strips in the first quarter of 2018 , compared with $579 thousand for the same period in 2017 . TCF recorded $335 thousand of impairment charges on the auto finance interest-only strips for the first quarter of 2018 , compared with $24 thousand for the same period in 2017 .

Allowance for Loan and Lease Lo

Allowance for Loan and Lease Losses and Credit Quality Information	3 Months Ended
	Mar. 31, 2018
Allowance for Loan and Lease Losses and Credit Quality Information
Allowance for Loan and Lease Losses and Credit Quality Information	Allowance for Loan and Lease Losses and Credit Quality Information The rollforwards of the allowance for loan and lease losses were as follows: (In thousands) Consumer Commercial Leasing and Inventory Auto Other Total At or For the Quarter Ended March 31, 2018: Balance, beginning of period $ 47,168 $ 37,195 $ 22,528 $ 13,233 $ 50,225 $ 692 $ 171,041 Charge-offs (2,154 ) — (1,956 ) (549 ) (13,441 ) (1,765 ) (19,865 ) Recoveries 1,037 14 616 140 2,785 1,122 5,714 Net (charge-offs) recoveries (1,117 ) 14 (1,340 ) (409 ) (10,656 ) (643 ) (14,151 ) Provision for credit losses 2,104 (11 ) 1,996 512 6,253 514 11,368 Other (470 ) — (2 ) (83 ) — — (555 ) Balance, end of period $ 47,685 $ 37,198 $ 23,182 $ 13,253 $ 45,822 $ 563 $ 167,703 At or For the Quarter Ended March 31, 2017: Balance, beginning of period $ 59,448 $ 32,695 $ 21,350 $ 13,932 $ 32,310 $ 534 $ 160,269 Charge-offs (3,452 ) (2,732 ) (2,046 ) (219 ) (8,813 ) (1,640 ) (18,902 ) Recoveries 10,692 65 614 119 1,233 1,090 13,813 Net (charge-offs) recoveries 7,240 (2,667 ) (1,432 ) (100 ) (7,580 ) (550 ) (5,089 ) Provision for credit losses (8,137 ) 3,669 1,386 1,965 12,857 453 12,193 Other (4,700 ) — (47 ) 19 (2,479 ) — (7,207 ) Balance, end of period $ 53,851 $ 33,697 $ 21,257 $ 15,816 $ 35,108 $ 437 $ 160,166 The allowance for loan and lease losses and loans and leases outstanding by type of allowance methodology were as follows: At March 31, 2018 (In thousands) Consumer Commercial Leasing and Inventory Auto Other Total Allowance for loan and lease losses: Collectively evaluated for impairment $ 29,591 $ 35,635 $ 18,975 $ 13,065 $ 45,613 $ 562 $ 143,441 Individually evaluated for impairment 18,094 1,563 4,207 188 209 1 24,262 Total $ 47,685 $ 37,198 $ 23,182 $ 13,253 $ 45,822 $ 563 $ 167,703 Loans and leases outstanding: Collectively evaluated for impairment $ 4,579,706 $ 3,642,783 $ 4,629,020 $ 3,454,234 $ 2,828,616 $ 19,850 $ 19,154,209 Individually evaluated for impairment 141,956 35,398 28,136 3,621 10,747 4 219,862 Loans acquired with deteriorated credit quality — — 9,083 — — — 9,083 Total $ 4,721,662 $ 3,678,181 $ 4,666,239 $ 3,457,855 $ 2,839,363 $ 19,854 $ 19,383,154 At December 31, 2017 (In thousands) Consumer Real Estate Commercial Leasing and Equipment Finance Inventory Finance Auto Finance Other Total Allowance for loan and lease losses: Collectively evaluated for impairment $ 28,851 $ 35,635 $ 19,083 $ 12,945 $ 49,900 $ 691 $ 147,105 Individually evaluated for impairment 18,317 1,560 3,445 288 325 1 23,936 Total $ 47,168 $ 37,195 $ 22,528 $ 13,233 $ 50,225 $ 692 $ 171,041 Loans and leases outstanding: Collectively evaluated for impairment $ 4,675,626 $ 3,524,864 $ 4,721,905 $ 2,735,638 $ 3,188,810 $ 22,513 $ 18,869,356 Individually evaluated for impairment 144,070 36,329 27,912 4,116 10,829 4 223,260 Loans acquired with deteriorated credit quality — — 11,844 — — — 11,844 Total $ 4,819,696 $ 3,561,193 $ 4,761,661 $ 2,739,754 $ 3,199,639 $ 22,517 $ 19,104,460 Accruing and Non-accrual Loans and Leases TCF's key credit quality indicator is the receivable's payment performance status, defined as accruing or non-accruing. Non-accrual loans and leases are those which management believes have a higher risk of loss. Delinquent balances are determined based on the contractual terms of the loan or lease. Loans and leases that are over 60 days delinquent have a higher potential to become non-accrual and generally are a leading indicator for future charge-off trends. TCF's accruing and non-accrual loans and leases were as follows: At March 31, 2018 (In thousands) Current-59 Days Delinquent and Accruing 60-89 Days Delinquent and Accruing 90 Days or More Delinquent and Accruing Total Accruing Non-accrual Total Consumer real estate: First mortgage lien $ 1,813,418 $ 3,670 $ 578 $ 1,817,666 $ 60,775 $ 1,878,441 Junior lien 2,818,158 1,601 — 2,819,759 23,462 2,843,221 Total consumer real estate 4,631,576 5,271 578 4,637,425 84,237 4,721,662 Commercial: Commercial real estate 2,802,819 — — 2,802,819 6,633 2,809,452 Commercial business 863,961 — — 863,961 4,768 868,729 Total commercial 3,666,780 — — 3,666,780 11,401 3,678,181 Leasing and equipment finance 4,632,004 4,600 584 4,637,188 19,968 4,657,156 Inventory finance 3,454,189 44 1 3,454,234 3,621 3,457,855 Auto finance 2,825,425 4,323 2,416 2,832,164 7,199 2,839,363 Other 19,804 17 31 19,852 2 19,854 Subtotal 19,229,778 14,255 3,610 19,247,643 126,428 19,374,071 Portfolios acquired with deteriorated credit quality 7,907 — 1,176 9,083 — 9,083 Total $ 19,237,685 $ 14,255 $ 4,786 $ 19,256,726 $ 126,428 $ 19,383,154 At December 31, 2017 (In thousands) Current-59 Days Delinquent and Accruing 60-89 Days Delinquent and Accruing 90 Days or More Delinquent and Accruing Total Accruing Non-accrual Total Consumer real estate: First mortgage lien $ 1,892,771 $ 4,073 $ 593 $ 1,897,437 $ 61,950 $ 1,959,387 Junior lien 2,837,767 1,268 — 2,839,035 21,274 2,860,309 Total consumer real estate 4,730,538 5,341 593 4,736,472 83,224 4,819,696 Commercial: Commercial real estate 2,744,500 — — 2,744,500 6,785 2,751,285 Commercial business 809,907 1 — 809,908 — 809,908 Total commercial 3,554,407 1 — 3,554,408 6,785 3,561,193 Leasing and equipment finance 4,726,339 4,272 2,117 4,732,728 17,089 4,749,817 Inventory finance 2,735,430 191 17 2,735,638 4,116 2,739,754 Auto finance 3,183,196 6,078 2,999 3,192,273 7,366 3,199,639 Other 22,506 3 6 22,515 2 22,517 Subtotal 18,952,416 15,886 5,732 18,974,034 118,582 19,092,616 Portfolios acquired with deteriorated credit quality 10,283 361 1,200 11,844 — 11,844 Total $ 18,962,699 $ 16,247 $ 6,932 $ 18,985,878 $ 118,582 $ 19,104,460 Interest income recognized on loans and leases in non-accrual status and contractual interest that would have been recorded had the loans and leases performed in accordance with their original contractual terms were as follows: Quarter Ended March 31, (In thousands) 2018 2017 Contractual interest due on non-accrual loans and leases $ 2,927 $ 4,498 Interest income recognized on non-accrual loans and leases 458 1,056 Unrecognized interest income $ 2,469 $ 3,442 Consumer real estate loans to customers currently involved in ongoing Chapter 7 or Chapter 13 bankruptcy proceedings which have not yet been discharged, dismissed or completed were as follows: (In thousands) At March 31, 2018 At December 31, 2017 Consumer real estate loans to customers in bankruptcy: 0-59 days delinquent and accruing $ 6,589 $ 7,324 Non-accrual 11,845 10,552 Total consumer real estate loans to customers in bankruptcy $ 18,434 $ 17,876 Loan Modifications for Borrowers with Financial Difficulties Included within loans and leases in the previous accruing and non-accrual loans and leases tables are certain loans that have been modified in order to maximize collection of loan balances. If, for economic or legal reasons related to the customer's financial difficulties, TCF grants a concession, the modified loan is classified as a troubled debt restructuring ("TDR") loan. All loans classified as TDR loans are considered to be impaired. For purposes of this disclosure, purchased credit impaired ("PCI") loans have been excluded. TDR loans were as follows: At March 31, 2018 At December 31, 2017 (In thousands) Accruing TDR Loans Non-accrual TDR Loans Total TDR Loans Accruing TDR Loans Non-accrual TDR Loans Total TDR Loans Consumer real estate $ 87,314 $ 33,531 $ 120,845 $ 88,092 $ 34,282 $ 122,374 Commercial 6,843 4,807 11,650 12,249 83 12,332 Leasing and equipment finance 7,365 1,691 9,056 10,263 1,413 11,676 Inventory finance — 371 371 — 476 476 Auto finance 3,549 5,296 8,845 3,464 5,351 8,815 Other 3 1 4 3 1 4 Total $ 105,074 $ 45,697 $ 150,771 $ 114,071 $ 41,606 $ 155,677 The allowance on accruing consumer real estate TDR loans was $16.8 million , or 19.2% of the outstanding balance, at March 31, 2018 and $17.1 million , or 19.4% of the outstanding balance, at December 31, 2017 . At March 31, 2018 , 0.1% of accruing consumer real estate TDR loans were more than 60 days delinquent, compared with 0.5% at December 31, 2017 . Consumer real estate TDR loans generally remain on accruing status following modification if they are less than 90 days past due and payment in full under the modified terms of the loan is expected based on a current credit evaluation and historical payment performance. Of the non-accrual TDR balance at March 31, 2018 , $21.1 million , or 63.0% , were loans discharged in Chapter 7 bankruptcy that were not reaffirmed by the borrower, of which 72.5% were current. Of the non-accrual TDR balance at December 31, 2017 , $22.3 million , or 65.0% , were loans discharged in Chapter 7 bankruptcy that were not reaffirmed, of which 70.0% were current. All eligible loans are re-aged to current delinquency status upon modification. The allowance on accruing TDRs for the remaining classes of finance receivables was not material at March 31, 2018 or December 31, 2017 . Accruing TDR loans that were 60 days or more delinquent at March 31, 2018 and December 31, 2017 were not material for the remaining classes of finance receivables. Unfunded commitments to consumer real estate and commercial loans classified as TDRs were $2.3 million and $0.9 million at March 31, 2018 and December 31, 2017 , respectively. At March 31, 2018 and December 31, 2017 , no additional funds were committed to leasing and equipment finance, inventory finance or auto finance loans classified as TDRs. Interest income on TDR loans is recognized based on the restructured terms. Unrecognized interest represents the difference between interest income recognized on accruing TDR loans and the contractual interest that would have been recorded under the original contractual terms. For the first quarter of 2018 , unrecognized interest income for consumer real estate first mortgage lien accruing TDR loans and consumer real estate junior lien accruing TDR loans was $0.4 million and $0.1 million , respectively. The average yield for the same period on consumer real estate accruing TDR loans was 4.2% , which compares to the original contractual average rate of 6.7% . For the first quarter of 2017 , unrecognized interest income for the consumer real estate first mortgage lien accruing TDR loans and consumer real estate junior lien accruing TDR loans was $0.5 million and $0.2 million , respectively. The average yield for the same period on consumer real estate accruing TDR loans was 4.2% , which compares to the original contractual average rate of 6.6% . The unrecognized interest income for the remaining classes of finance receivables was not material for the first quarter of 2018 or 2017 . TCF considers a loan to have defaulted when under the modified terms it becomes 90 or more days delinquent, has been transferred to non-accrual status, has been charged down or has been transferred to other real estate owned or repossessed and returned assets. The following table summarizes the TDR loans that defaulted during the first quarter of 2018 and 2017 , which were modified during the respective reporting period or within one year of the beginning of the respective reporting period. Included in commercial loans that defaulted during the first quarter of 2018 was one commercial loan that was transferred to non-accrual status, compared to three commercial loans that were transferred to non-accrual status during the first quarter of 2017 . Quarter Ended March 31, (In thousands) 2018 2017 Defaulted TDR loan balances modified during the applicable period: (1) Consumer real estate: First mortgage lien $ 1,480 $ 368 Junior lien 28 112 Total consumer real estate 1,508 480 Commercial: Commercial real estate — 6,681 Commercial business 4,697 3,353 Total commercial 4,697 10,034 Leasing and equipment finance — 407 Auto finance 364 302 Defaulted TDR loan balances modified during the applicable period $ 6,569 $ 11,223 (1) The loan balances presented are not materially different than the pre-modification loan balances as TCF's loan modifications generally do not forgive principal amounts. Impaired Loans TCF considers impaired loans to include non-accrual commercial loans, non-accrual equipment finance loans and non-accrual inventory finance loans, as well as all TDR loans. For purposes of this disclosure, PCI loans have been excluded. Non-accrual impaired loans, including non-accrual TDR loans, are included in non-accrual loans and leases within the previous tables. Accruing TDR loans have been disclosed by delinquency status within the previous tables of accruing and non-accrual loans and leases. In the following table, the loan balance of impaired loans represents the amount recorded within loans and leases on the Consolidated Statements of Financial Condition, whereas the unpaid contractual balance represents the balances legally owed by the borrowers. Information on impaired loans was as follows: At March 31, 2018 At December 31, 2017 (In thousands) Unpaid Loan Related Unpaid Loan Related Impaired loans with an allowance recorded: Consumer real estate: First mortgage lien $ 90,065 $ 79,687 $ 13,491 $ 91,624 $ 80,802 $ 13,792 Junior lien 31,763 29,200 4,086 32,327 29,544 4,165 Total consumer real estate 121,828 108,887 17,577 123,951 110,346 17,957 Commercial: Commercial real estate 6,766 6,559 1,000 6,810 6,702 1,000 Commercial business 7,262 7,264 563 7,841 7,841 560 Total commercial 14,028 13,823 1,563 14,651 14,543 1,560 Leasing and equipment finance 16,548 16,548 1,897 17,105 17,105 1,345 Inventory finance 1,185 1,189 188 1,296 1,298 288 Auto finance 961 729 138 1,333 1,016 243 Other 3 4 1 3 4 1 Total impaired loans with an allowance recorded 154,553 141,180 21,364 158,339 144,312 21,394 Impaired loans without an allowance recorded: Consumer real estate: First mortgage lien 12,844 10,397 — 12,898 10,445 — Junior lien 13,777 1,561 — 17,697 1,583 — Total consumer real estate 26,621 11,958 — 30,595 12,028 — Commercial: Commercial real estate 4,483 4,421 — 4,552 4,491 — Commercial business — — — — — — Total commercial 4,483 4,421 — 4,552 4,491 — Inventory finance 2,426 2,432 — 2,810 2,818 — Auto finance 11,376 8,116 — 10,566 7,799 — Other 331 — — 331 — — Total impaired loans without an allowance recorded 45,237 26,927 — 48,854 27,136 — Total impaired loans $ 199,790 $ 168,107 $ 21,364 $ 207,193 $ 171,448 $ 21,394 The average loan balance of impaired loans and interest income recognized on impaired loans were as follows: Quarter Ended March 31, 2018 2017 (In thousands) Average Loan Balance Interest Income Recognized Average Loan Balance Interest Income Recognized Impaired loans with an allowance recorded: Consumer real estate: First mortgage lien $ 80,245 $ 654 $ 96,979 $ 725 Junior lien 29,372 305 43,827 446 Total consumer real estate 109,617 959 140,806 1,171 Commercial: Commercial real estate 6,631 — 6,733 16 Commercial business 7,552 86 1,052 48 Total commercial 14,183 86 7,785 64 Leasing and equipment finance 16,826 6 10,620 3 Inventory finance 1,243 23 4,510 52 Auto finance 873 — 5,109 46 Other 4 — 6 — Total impaired loans with an allowance recorded 142,746 1,074 168,836 1,336 Impaired loans without an allowance recorded: Consumer real estate: First mortgage lien 10,421 183 12,342 318 Junior lien 1,572 55 1,883 252 Total consumer real estate 11,993 238 14,225 570 Commercial: Commercial real estate 4,457 58 17,936 174 Commercial business — — 429 — Total commercial 4,457 58 18,365 174 Inventory finance 2,625 57 638 44 Auto finance 7,957 69 2,590 — Total impaired loans without an allowance recorded 27,032 422 35,818 788 Total impaired loans $ 169,778 $ 1,496 $ 204,654 $ 2,124 Other Real Estate Owned and Repossessed and Returned Assets Other real estate owned and repossessed and returned assets were as follows: (In thousands) At March 31, 2018 At December 31, 2017 Other real estate owned $ 17,179 $ 18,225 Repossessed and returned assets 13,248 12,630 Consumer real estate loans in process of foreclosure 21,449 22,622 Other real estate owned and repossessed and returned assets were written down $1.2 million and $1.7 million for the first quarter of 2018 and 2017 , respectively, and included in net foreclosed real estate and repossessed assets expense.

Long-term Borrowings

Long-term Borrowings	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Long-term Borrowings	Long-term Borrowings Long-term borrowings were as follows: At March 31, 2018 At December 31, 2017 (Dollars in thousands) Stated Maturity Amount Stated Rate Amount Stated Rate Federal Home Loan Bank advances 2019 $ — — % $ 600,000 1.40 % - 1.75 % 2020 1,100,000 1.86 % - 2.25 275,000 1.76 - 1.78 Subtotal 1,100,000 875,000 Subordinated bank notes 2022 108,923 6.25 108,867 6.25 2025 148,304 4.60 148,252 4.60 Hedge-related basis adjustment (1) (5,808 ) (2,157 ) Subtotal 251,419 254,962 Discounted lease rentals 2018 36,140 2.73 - 7.95 52,347 2.55 - 7.95 2019 36,042 2.53 - 6.00 34,978 2.53 - 6.00 2020 20,843 2.64 - 6.50 19,736 2.64 - 6.50 2021 10,700 2.88 - 5.49 10,077 2.88 - 5.00 2022 2,829 3.04 - 5.43 2,349 3.04 - 5.43 2023 3 5.40 - 5.40 — — Subtotal 106,557 119,487 Total long-term borrowings $ 1,457,976 $ 1,249,449 (1) Related to subordinated bank notes with a stated maturity of 2025. At March 31, 2018 , TCF Bank had pledged loans secured by consumer and commercial real estate and Federal Home Loan Bank ("FHLB") stock with an aggregate carrying value of $4.3 billion as collateral for FHLB advances. At March 31, 2018 , $1.1 billion of the FHLB advances outstanding were prepayable at TCF's option.

Equity

Equity	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Equity	Equity Preferred Stock Preferred stock was as follows: (In thousands) At March 31, 2018 At December 31, 2017 Series B non-cumulative perpetual preferred stock $ — $ 96,519 Series C non-cumulative perpetual preferred stock 169,302 169,302 Total preferred stock $ 169,302 $ 265,821 At March 31, 2018 and December 31, 2017 , TCF had 7,000,000 depositary shares outstanding, each representing a 1/1000 th ownership interest in a share of the 5.70% Series C non-cumulative perpetual preferred stock of TCF Financial Corporation, par value $0.01 per share, with a liquidation preference of $25,000 per share (equivalent to $25 per depositary share) (the "Series C Preferred Stock"). Dividends are payable on the Series C Preferred Stock if, as and when declared by TCF's Board of Directors on a non-cumulative basis on March 1, June 1, September 1 and December 1 of each year at a per annum rate of 5.70% . TCF paid cash dividends to holders of the Series C Preferred Stock of $2.5 million for the first quarter of 2018 . The Series C Preferred Stock may be redeemed at TCF's option in whole or in part on December 1, 2022 or on any dividend payment date thereafter. On March 1, 2018, TCF redeemed all 4,000,000 of the outstanding shares of the 6.45% Series B non-cumulative perpetual preferred stock of TCF Financial Corporation, par value $0.01 per share, with a liquidation preference of $25 per share (the "Series B Preferred Stock") for $100.0 million . Deferred stock issuance costs of $3.5 million originally recorded as a reduction to preferred stock upon the issuance of the Series B Preferred Stock were reclassified to retained earnings and resulted in a one-time, non-cash reduction to net income available to common stockholders utilized in the computation of earnings per common share and diluted earnings per common share for the first quarter of 2018 . Dividends were payable on the Series B Preferred Stock if, as and when declared by TCF's Board of Directors on a non-cumulative basis on March 1, June 1, September 1 and December 1 of each year at a per annum rate of 6.45% . TCF paid cash dividends to holders of the Series B Preferred Stock of $1.6 million for both the first quarter of 2018 and 2017 . Treasury Stock and Other Treasury stock and other were as follows: (In thousands) At March 31, 2018 At December 31, 2017 Treasury stock, at cost $ 67,938 $ 10,265 Shares held in trust for deferred compensation plans, at cost 29,862 30,532 Total $ 97,800 $ 40,797 TCF repurchased 2,567,171 shares of its common stock in the first quarter of 2018 at an average cost of $22.45 per share pursuant to its share repurchase program. These shares were recorded as treasury stock. No repurchases of common stock were made in the first quarter of 2017 . At March 31, 2018 , TCF had the authority to repurchase an additional $83.2 million in aggregate value of shares pursuant to its stock repurchase program authorized by TCF's Board of Directors.

Regulatory Capital Requirements

Regulatory Capital Requirements	3 Months Ended
	Mar. 31, 2018
Regulatory Capital Requirements [Abstract]
Regulatory Capital Requirements	Regulatory Capital Requirements TCF and TCF Bank are subject to minimum capital requirements administered by the federal banking regulators. Failure to meet minimum capital requirements can initiate certain mandatory, and possible additional discretionary, actions by the federal banking regulators that could have a material adverse effect on TCF. In general, TCF Bank may not declare or pay a dividend to TCF Financial in excess of 100% of its net retained earnings for the current year combined with its net retained earnings for the preceding two calendar years, which was $253.7 million at March 31, 2018 , without prior approval of the Office of the Comptroller of the Currency ("OCC"). The OCC also has the authority to prohibit the payment of dividends by a national bank when it determines such payments would constitute an unsafe and unsound banking practice. TCF Bank's ability to make capital distributions in the future may require regulatory approval and may be restricted by its federal banking regulators. TCF Bank's ability to make any such distributions will also depend on its earnings and ability to meet minimum regulatory capital requirements in effect during future periods. In the future, these capital adequacy standards may be higher than existing minimum regulatory capital requirements. Regulatory capital information for TCF and TCF Bank was as follows: TCF TCF Bank At March 31, At December 31, At March 31, At December 31, Well-capitalized Standard Minimum Capital Requirement (1) (Dollars in thousands) 2018 2017 2018 2017 Regulatory Capital: Common equity Tier 1 capital $ 2,222,390 $ 2,242,410 $ 2,300,115 $ 2,409,027 Tier 1 capital 2,414,838 2,522,178 2,328,552 2,426,854 Total capital 2,786,637 2,889,323 2,736,257 2,837,374 Regulatory Capital Ratios: Common equity Tier 1 capital ratio 10.57 % 10.79 % 10.94 % 11.59 % 6.50 % 4.50 % Tier 1 risk-based capital ratio 11.49 12.14 11.08 11.68 8.00 6.00 Total risk-based capital ratio 13.26 13.90 13.02 13.65 10.00 8.00 Tier 1 leverage ratio 10.52 11.12 10.14 10.70 5.00 4.00 (1) Excludes capital conservation buffer of 1.875% and 1.25% as of March 31, 2018 and December 31, 2017 .

Stock Compensation

Stock Compensation	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Compensation	Stock Compensation TCF's restricted stock award and stock option transactions under the TCF Financial 2015 Omnibus Incentive Plan ("Omnibus Incentive Plan") and the TCF Financial Incentive Stock Program were as follows: Restricted Stock Awards Stock Options Shares Weighted- average Grant Date Fair Value Shares Weighted- average Remaining Contractual Life in Years Weighted- average Exercise Price Outstanding at December 31, 2017 2,639,663 $ 13.65 366,000 0.06 $ 15.75 Granted 450,795 22.19 — — — Exercised — — (366,000 ) — 15.75 Forfeited/canceled (93,820 ) 14.78 — — — Vested (477,179 ) 10.73 — — — Outstanding at March 31, 2018 2,519,459 15.69 — — — Exercisable at March 31, 2018 N.A. N.A. — — N.A. Not Applicable. At March 31, 2018 , there were 264,373 shares of performance-based restricted stock awards outstanding that will vest only if certain performance goals and service conditions are achieved. Failure to achieve the performance goals and service conditions will result in all or a portion of the shares being forfeited. Unrecognized stock compensation expense for restricted stock awards was $22.0 million with a weighted-average remaining amortization period of 1.5 years at March 31, 2018 . At March 31, 2018 , there were 411,825 performance-based restricted stock units granted under the Omnibus Incentive Plan that will vest only if certain performance goals are achieved. The number of restricted stock units granted was at target and the actual restricted stock units that will vest will depend on actual performance with a maximum total payout of 150% of target. Failure to achieve the performance goals will result in all or a portion of the restricted stock units being forfeited. The remaining weighted-average performance period of the restricted stock units was 2.1 years at March 31, 2018 . Compensation expense for restricted stock awards and restricted stock units was $5.9 million and $1.9 million for the first quarter of 2018 and 2017 , respectively.

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans The net periodic benefit plan (income) cost included in other non-interest expense for the TCF Cash Balance Pension Plan (the "Pension Plan") and the Postretirement Plan were as follows: Pension Plan Quarter Ended March 31, (In thousands) 2018 2017 Interest cost $ 246 $ 285 Return on plan assets (132 ) (142 ) Net periodic benefit plan (income) cost $ 114 $ 143 Postretirement Plan Quarter Ended March 31, (In thousands) 2018 2017 Interest cost $ 28 $ 34 Amortization of prior service cost (12 ) (12 ) Net periodic benefit plan (income) cost $ 16 $ 22 TCF made no cash contributions to the Pension Plan in either of the first quarter of 2018 or 2017 . During the first quarter of 2018 and 2017 , TCF contributed $0.1 million to the Postretirement Plan.

Derivative Instruments

Derivative Instruments	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments All derivative instruments are recognized at fair value within other assets or accrued expenses and other liabilities on the Consolidated Statements of Financial Condition. Derivative instruments were as follows: At March 31, 2018 (In thousands) Notional Amount Gross Amounts Recognized Gross Amounts Offset Net Amount Presented Derivative Assets: Derivatives designated as hedging instruments: Interest rate contract $ 150,000 $ 311 $ (311 ) $ — Total derivative assets designated as hedging instruments 311 (311 ) — Derivatives not designated as hedging instruments: Forward foreign exchange contracts 85,305 218 (218 ) — Interest rate contracts 101,172 704 (176 ) 528 Interest rate lock commitments 37,820 558 — 558 Total derivative assets not designated as hedging instruments 1,480 (394 ) 1,086 Total derivative assets $ 1,791 $ (705 ) $ 1,086 Derivative Liabilities: Derivatives designated as hedging instruments: Forward foreign exchange contracts $ 78,248 $ 291 $ (94 ) $ 197 Total derivative liabilities designated as hedging instruments 291 (94 ) 197 Derivatives not designated as hedging instruments: Forward foreign exchange contracts 241,103 2,214 (2,077 ) 137 Interest rate contracts 576,844 4,799 (388 ) 4,411 Other contracts 13,804 538 (538 ) — Total derivative liabilities not designated as hedging instruments 7,551 (3,003 ) 4,548 Total derivative liabilities $ 7,842 $ (3,097 ) $ 4,745 At December 31, 2017 (In thousands) Notional Gross Amounts Gross Amounts Net Amount Derivative Assets: Derivatives designated as hedging instruments: Interest rate contract $ 150,000 $ 405 $ (405 ) $ — Total derivative assets designated as hedging instruments 405 (405 ) — Derivatives not designated as hedging instruments: Interest rate contracts 169,377 1,392 (52 ) 1,340 Interest rate lock commitments 17,974 223 — 223 Total derivative assets not designated as hedging instruments 1,615 (52 ) 1,563 Total derivative assets $ 2,020 $ (457 ) $ 1,563 Derivative Liabilities: Derivatives designated as hedging instruments: Forward foreign exchange contracts $ 77,879 $ 1,744 $ (1,744 ) $ — Total derivative liabilities designated as hedging instruments 1,744 (1,744 ) — Derivatives not designated as hedging instruments: Forward foreign exchange contracts 330,928 4,619 (4,282 ) 337 Interest rate contracts 423,006 1,688 (457 ) 1,231 Other contracts 13,804 615 (615 ) — Interest rate lock commitments 41 — — — Total derivative liabilities not designated as hedging instruments 6,922 (5,354 ) 1,568 Total derivative liabilities $ 8,666 $ (7,098 ) $ 1,568 Derivatives Designated as Hedging Instruments Interest Rate Contract TCF Bank entered into an interest rate swap agreement which was designated as a fair value hedge of its contemporaneously issued subordinated debt. The interest rate swap agreement effectively converts the fixed interest rate to a floating rate based on the three-month London InterBank Offered Rate plus a number of basis points on the $150.0 million notional amount. See Note 7 . Long-term Borrowings for further information. As of March 31, 2018 and December 31, 2017 , the following amounts were recorded on the Consolidated Statements of Financial Condition related to the cumulative basis adjustment for the subordinated debt: Line Item in the Consolidated Statement of Financial Condition in Which the Hedged Item is Included Carrying Amount of the Hedged Liability Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Liability (In thousands) At March 31, 2018 At December 31, 2017 At March 31, 2018 At December 31, 2017 Long-term borrowings $ 142,496 $ 146,095 $ (5,808 ) $ (2,157 ) The gains and losses related to changes in the fair value of the interest rate swap, as well as the offsetting changes in fair value of the hedged debt, were as follows: Quarter Ended March 31, (In thousands) 2018 2017 Total amount presented in the Consolidated Statements of Income in which the effects of the fair value hedge are recorded: Interest expense - borrowings $ 9,553 $ — Other non-interest income — 2,703 Effect of fair value hedge: Income (expense) Hedged item $ 3,806 $ 513 Derivative designated as a hedging instrument (3,858 ) (501 ) Forward Foreign Exchange Contracts Certain of TCF's forward foreign exchange contracts are used to manage the foreign exchange risk associated with the Company's net investment in TCF Commercial Finance Canada, Inc., a wholly-owned indirect Canadian subsidiary of TCF Bank. These forward foreign exchange contracts have been designated as net investment hedges. The effect of net investment hedges on accumulated other comprehensive income was as follows: Quarter Ended March 31, (In thousands) 2018 2017 Forward foreign exchange contracts $ 2,137 $ (504 ) Derivatives Not Designated as Hedging Instruments Certain other forward foreign exchange contracts and interest rate contracts, along with other contracts and interest rate lock commitments have not been designated as hedging instruments. The effect of these derivatives included in the Consolidated Statements of Income was as follows: Quarter Ended March 31, (In thousands) Location of Gain (Loss) 2018 2017 Forward foreign exchange contracts Other non-interest expense $ 8,944 $ (3,259 ) Interest rate lock commitments Gains on sales of consumer real estate 624 167 Interest rate contracts Other non-interest income 99 (9 ) Net gain (loss) recognized $ 9,667 $ (3,101 ) TCF executes all of its forward foreign exchange contracts in the over-the-counter market with large financial institutions pursuant to International Swaps and Derivatives Association, Inc. agreements. These agreements include credit risk-related features that enhance the creditworthiness of these instruments, as compared with other obligations of the respective counterparty with whom TCF has transacted, by requiring that additional collateral be posted under certain circumstances. The amount of collateral required depends on the contract and is determined daily based on market and currency exchange rate conditions. At March 31, 2018 and December 31, 2017 , credit risk-related contingent features existed on forward foreign exchange contracts with a notional value of $93.1 million and $39.8 million , respectively. In the event TCF is rated less than BB- by Standard and Poor's, the contracts could be terminated or TCF may be required to provide approximately $1.9 million and $0.8 million in additional collateral at March 31, 2018 and December 31, 2017 , respectively. There were $0.7 million and $0.4 million of forward foreign exchange contracts containing credit risk-related features in a liability position at March 31, 2018 and December 31, 2017 , respectively. At March 31, 2018 , TCF had posted $7.4 million , $2.0 million and $1.4 million of cash collateral related to its interest rate contracts, forward foreign exchange contracts and other contracts, respectively.

Fair Values Disclosures

Fair Values Disclosures	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value Disclosures TCF uses fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The Company's fair values are based on the price that would be received upon the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Debt securities available for sale, certain loans held for sale, interest-only strips, forward foreign exchange contracts, interest rate contracts, other contracts, interest rate lock commitments, forward loan sales commitments, and assets and liabilities held in trust for deferred compensation plans are recorded at fair value on a recurring basis. From time to time we may be required to record at fair value other assets on a non-recurring basis, such as certain debt securities held to maturity, loans, goodwill, other intangible assets, other real estate owned, repossessed and returned assets and the securitization receivable. These non-recurring fair value adjustments typically involve application of lower of cost or fair value accounting or write-downs of individual assets. TCF groups its assets and liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the degree and reliability of estimates and assumptions used to determine fair value. The levels are as follows: Level 1, which includes valuations that are based on prices obtained from independent pricing sources for the same instruments traded in active markets; Level 2, which includes valuations that are based on prices obtained from independent pricing sources that are based on observable transactions of similar instruments, but not quoted markets and Level 3, which includes valuations generated from Company model-based techniques that use significant unobservable inputs. Such unobservable inputs reflect estimates of assumptions that market participants would use in pricing the asset or liability. The following is a discussion of the valuation methodologies used to record assets and liabilities at fair value on a recurring or non-recurring basis. Debt Securities Available for Sale Debt securities available for sale consist primarily of securities of U.S. Government sponsored enterprises and federal agencies, and obligations of states and political subdivisions. The fair value of these securities, categorized as Level 2, is recorded using prices obtained from independent asset pricing services that are based on observable transactions, but not quoted markets. Management reviews the prices obtained from independent asset pricing services for unusual fluctuations and comparisons to current market trading activity. Loans Held for Sale Loans held for sale for which the fair value option has been elected are categorized as Level 3. The fair value of these loans is recorded utilizing internal valuation models which use quoted investor prices to estimate the fair value. Loans Loans for which repayment is expected to be provided solely by the value of the underlying collateral, categorized as Level 3 and recorded at fair value on a non-recurring basis, are valued based on the fair value of that collateral less estimated selling costs. Such loans include non-accrual impaired loans as well as certain delinquent non-accrual consumer real estate and auto finance loans. The fair value of the collateral is determined based on internal estimates and assessments provided by third-party appraisers. Interest-only Strips The fair value of interest-only strips, categorized as Level 3, represents the present value of future cash flows expected to be received by TCF on certain assets. TCF uses available market data, along with its own empirical data and discounted cash flow models, to arrive at the fair value of its interest-only strips. The present value of the estimated expected future cash flows to be received is determined by using discount, loss and prepayment rates that TCF believes are commensurate with the risks associated with the cash flows and what a market participant would use. These assumptions are inherently subject to volatility and uncertainty and, as a result, the fair value of the interest-only strips may fluctuate significantly from period to period. Derivative Instruments Forward Foreign Exchange Contracts TCF's forward foreign exchange contracts are currency contracts executed in over-the-counter markets and are recorded at fair value using a cash flow model that includes key inputs such as foreign exchange rates and an assessment of the risk of counterparty non-performance. The risk of counterparty non-performance is based on external assessments of credit risk. The fair value of these contracts, categorized as Level 2, is based on observable transactions, but not quoted markets. Interest Rate Contracts TCF executes interest rate contracts with commercial banking customers to facilitate their respective risk management strategies. Certain of these interest rate contracts are simultaneously hedged by offsetting interest rate contracts TCF executes with a third party, minimizing TCF's net interest rate risk exposure resulting from such transactions. TCF also has an interest rate swap agreement to convert its $150.0 million of fixed-rate subordinated notes to floating rate debt. These derivative instruments are recorded at fair value. The fair value of these interest rate contracts, categorized as Level 2, is determined using a cash flow model which considers the forward curve, the discount curve and credit valuation adjustments related to counterparty and/or borrower non-performance risk. Other Contracts TCF's swap agreement, categorized as Level 3, is related to the sale of TCF's Visa Class B stock. The fair value of the swap agreement is based on TCF's estimated exposure related to the Visa covered litigation through a probability analysis of the funding and estimated settlement amounts. Interest Rate Lock Commitments TCF's interest rate lock commitments are derivative instruments that are recorded at fair value using an internal valuation model that utilizes estimated rates of successful loan closings and quoted investor prices. While this model uses both Level 2 and Level 3 inputs, TCF has determined that the significant inputs used in the valuation of these commitments fall within Level 3 and therefore the interest rate lock commitments are categorized as Level 3. Forward Loan Sales Commitments TCF enters into forward loan sales commitments to sell certain consumer real estate loans. The resulting loans held for sale are recorded at fair value under the elected fair value option. TCF relies on internal valuation models to estimate the fair value of these instruments. The valuation models utilize estimated rates of successful loan closings and quoted investor prices. While these models use both Level 2 and Level 3 inputs, TCF has determined that the significant inputs used in the valuation of these commitments fall within Level 3 and therefore the forward loan sales commitments are categorized as Level 3. Other Real Estate Owned and Repossessed and Returned Assets The fair value of other real estate owned, categorized as Level 3, is based on independent appraisals, real estate brokers' price opinions or automated valuation methods, less estimated selling costs. Certain properties require assumptions that are not observable in an active market in the determination of fair value. The fair value of repossessed and returned assets is based on available pricing guides, auction results or price opinions, less estimated selling costs. Assets acquired through foreclosure, repossession or returned to TCF are initially recorded at the lower of the loan or lease carrying amount or fair value less estimated selling costs at the time of transfer to other real estate owned or repossessed and returned assets. Assets and Liabilities Held in Trust for Deferred Compensation Plans Assets held in trust for deferred compensation plans include investments in publicly traded securities, excluding TCF common stock reported in treasury stock and other equity, and U.S. Treasury notes. The fair value of these assets, categorized as Level 1, is based on prices obtained from independent asset pricing services based on active markets. The fair value of the liabilities equals the fair value of the assets. The balances of assets and liabilities measured at fair value on a recurring and non-recurring basis were as follows: Fair Value Measurements at March 31, 2018 (In thousands) Level 1 Level 2 Level 3 Total Recurring Fair Value Measurements through Net Income: Assets: Loans held for sale $ — $ — $ 9,058 $ 9,058 Forward foreign exchange contracts (1) — 218 — 218 Interest rate contracts (1) — 1,015 — 1,015 Interest rate lock commitments (1) — — 558 558 Forward loan sales commitments — — 182 182 Assets held in trust for deferred compensation plans 29,952 — — 29,952 Total assets $ 29,952 $ 1,233 $ 9,798 $ 40,983 Liabilities: Forward foreign exchange contracts (1) $ — $ 2,214 $ — $ 2,214 Interest rate contracts (1) — 4,799 — 4,799 Other contracts (1) — — 538 538 Forward loan sales commitments — — 38 38 Liabilities held in trust for deferred compensation plans 29,952 — — 29,952 Total liabilities $ 29,952 $ 7,013 $ 576 $ 37,541 Recurring Fair Value Measurements through Other Comprehensive Income: Assets: Debt securities available for sale: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ — $ 1,141,652 $ — $ 1,141,652 Other — — 5 5 Obligations of states and political subdivisions — 812,589 — 812,589 Interest-only strips — — 21,851 21,851 Total assets $ — $ 1,954,241 $ 21,856 $ 1,976,097 Liabilities: Forward foreign exchange contracts (1) $ — $ 291 $ — $ 291 Total liabilities $ — $ 291 $ — $ 291 Non-recurring Fair Value Measurements: Loans $ — $ — $ 76,424 $ 76,424 Other real estate owned: Consumer — — 13,002 13,002 Commercial — — 85 85 Repossessed and returned assets — 4,505 3,579 8,084 Total non-recurring fair value measurements $ — $ 4,505 $ 93,090 $ 97,595 (1) As permitted under GAAP, TCF has elected to net derivative assets and derivative liabilities when a legally enforceable master netting agreement exists as well as the related cash collateral received and paid. For purposes of this table, the derivative assets and derivative liabilities are presented gross of this netting adjustment. Fair Value Measurements at December 31, 2017 (In thousands) Level 1 Level 2 Level 3 Total Recurring Fair Value Measurements through Net Income: Assets: Loans held for sale $ — $ — $ 3,356 $ 3,356 Interest rate contracts (1) — 1,797 — 1,797 Interest rate lock commitments (1) — — 223 223 Forward loan sales commitments — — 68 68 Assets held in trust for deferred compensation plans 29,962 — — 29,962 Total assets $ 29,962 $ 1,797 $ 3,647 $ 35,406 Liabilities: Forward foreign exchange contracts (1) $ — $ 4,619 $ — $ 4,619 Interest rate contracts (1) — 1,688 — 1,688 Other contracts (1) — — 615 615 Forward loan sales commitments — — 5 5 Liabilities held in trust for deferred compensation plans 29,962 — — 29,962 Total liabilities $ 29,962 $ 6,307 $ 620 $ 36,889 Recurring Fair Value Measurements through Other Comprehensive Income: Assets: Debt securities available for sale: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ — $ 894,685 $ — $ 894,685 Other — — 6 6 Obligations of states and political subdivisions — 814,327 — 814,327 Interest-only strips — — 21,386 21,386 Total assets $ — $ 1,709,012 $ 21,392 $ 1,730,404 Liabilities: Forward foreign exchange contracts (1) $ — $ 1,744 $ — $ 1,744 Total liabilities $ — $ 1,744 $ — $ 1,744 Non-recurring Fair Value Measurements: Loans $ — $ — $ 72,287 $ 72,287 Other real estate owned: Consumer — — 13,951 13,951 Commercial — — 85 85 Repossessed and returned assets — 3,669 4,388 8,057 Total non-recurring fair value measurements $ — $ 3,669 $ 90,711 $ 94,380 (1) As permitted under GAAP, TCF has elected to net derivative assets and derivative liabilities when a legally enforceable master netting agreement exists as well as the related cash collateral received and paid. For purposes of this table, the derivative assets and derivative liabilities are presented gross of this netting adjustment. Management assesses the appropriate classification of financial assets and liabilities within the fair value hierarchy by monitoring the level of available observable market information. Changes in markets or economic conditions, as well as changes to Company valuation models, may require the transfer of financial instruments from one fair value level to another. Such transfers, if any, are recorded at the fair values as of the beginning of the quarter in which the transfer occurred. TCF had no transfers in the first quarter of 2018 or 2017 . The changes in Level 3 assets and liabilities measured at fair value on a recurring basis were as follows: (In thousands) Debt Securities Loans Interest-only Strips Interest Forward Other Contracts At or For the Quarter Ended March 31, 2018: Asset (liability) balance, beginning of period $ 6 $ 3,356 $ 21,386 $ 223 $ 63 $ (615 ) Total net gains (losses) included in: Net income — 97 331 335 81 — Other comprehensive income (loss) — — 777 — — — Sales — (59,747 ) — — — — Originations — 65,355 3,299 — — — Principal paydowns / settlements (1 ) (3 ) (3,942 ) — — 77 Asset (liability) balance, end of period $ 5 $ 9,058 $ 21,851 $ 558 $ 144 $ (538 ) At or For the Quarter Ended March 31, 2017: Asset (liability) balance, beginning of period $ 18 $ 6,498 $ 40,152 $ 297 $ 361 $ (619 ) Total net gains (losses) included in: Net income — 104 1,113 167 (453 ) — Other comprehensive income (loss) — — (328 ) — — — Sales — (46,714 ) — — — — Originations — 43,479 1,347 — — — Principal paydowns / settlements (4 ) (5 ) (6,501 ) — — 78 Asset (liability) balance, end of period $ 14 $ 3,362 $ 35,783 $ 464 $ (92 ) $ (541 ) Fair Value Option TCF Bank originates first mortgage lien loans in its primary banking markets and sells the loans through a correspondent relationship. TCF elected the fair value option for these loans. This election facilitates the offsetting of changes in fair value of the loans held for sale and the derivative financial instruments used to economically hedge them. The difference between the aggregate fair value and aggregate unpaid principal balance of these loans held for sale was as follows: (In thousands) At March 31, 2018 At December 31, 2017 Fair value carrying amount $ 9,058 $ 3,356 Aggregate unpaid principal amount 8,911 3,268 Fair value carrying amount less aggregate unpaid principal $ 147 $ 88 Differences between the fair value carrying amount and the aggregate unpaid principal balance include changes in fair value recorded at and subsequent to funding and gains and losses on the related loan commitment prior to funding. No loans recorded under the fair value option were delinquent or on non-accrual status at March 31, 2018 or December 31, 2017 . The net gain from initial measurement of the correspondent lending loans held for sale, any subsequent changes in fair value while the loans are outstanding and any actual adjustment to the gains realized upon sales of the loans totaled $1.6 million for the first quarter of 2018 , compared with $1.1 million for the same period in 2017 , and are included in net gains on sales of consumer real estate loans. This amount excludes the impact from the interest rate lock commitments and forward loan sales commitments which are also included in net gains on sales of consumer real estate loans. Disclosures About Fair Value of Financial Instruments Management discloses the estimated fair value of financial instruments, including assets and liabilities on and off the balance sheet, for which it is practicable to estimate fair value. These fair value estimates were made at March 31, 2018 and December 31, 2017 based on relevant market information and information about the financial instruments. Fair value estimates are intended to represent the price at which an asset could be sold or a liability could be settled. However, given there is no active market or observable market transactions for many of the Company's financial instruments, the estimates of fair values are subjective in nature, involve uncertainties and include matters of significant judgment. Changes in assumptions could significantly affect the estimated values. The following is a summary of the fair value classifications used for the financial instruments not recorded at fair value. Investments The estimated fair value of investments in FHLB stock and Federal Reserve Bank stock is categorized as Level 2. Debt Securities Held to Maturity The estimated fair value of mortgage-backed securities of U.S. Government sponsored enterprises and federal agencies is categorized as Level 2. The estimated fair value of other debt securities held to maturity is categorized as Level 3. Loans Held for Sale The estimated fair value of loans held for sale is categorized as Level 3. Loans The estimated fair value of loans is categorized as Level 3. Securitization Receivable The estimated fair value of the securitization receivable is categorized as Level 3. Deposits The estimated fair value of checking, savings and money market deposits is categorized as Level 1. The estimated fair value of certificates of deposit is categorized as Level 2. The intangible value of long-term relationships with depositors is not taken into account in the estimated fair values disclosed. Long-term Borrowings The estimated fair value of TCF's long-term borrowings is categorized as Level 2. Financial Instruments with Off-Balance Sheet Risk The estimated fair value of TCF's commitments to extend credit and standby letters of credit is categorized as Level 2. The carrying amounts and estimated fair values of the Company's financial instruments, excluding short-term financial assets and liabilities as their carrying amounts approximate fair value, and excluding financial instruments recorded at fair value on a recurring basis, were as follows. This information represents only a portion of TCF's balance sheet and not the estimated value of the Company as a whole. Non-financial instruments such as the intangible value of TCF's branches and core deposits, leasing operations, goodwill, premises and equipment and the future revenues from TCF's customers are not reflected in this disclosure. Therefore, this information is of limited use in assessing the value of TCF. Carrying Amount Estimated Fair Value at March 31, 2018 (In thousands) Level 1 Level 2 Level 3 Total Financial instrument assets: Investments $ 91,661 $ — $ 91,661 $ — $ 91,661 Debt securities held to maturity 158,099 — 155,696 2,800 158,496 Loans held for sale 50,075 — — 51,654 51,654 Loans: Consumer real estate 4,721,662 — — 4,791,418 4,791,418 Commercial real estate 2,809,452 — — 2,757,467 2,757,467 Commercial business 868,729 — — 843,412 843,412 Equipment finance 2,220,591 — — 2,174,558 2,174,558 Inventory finance 3,457,855 — — 3,441,004 3,441,004 Auto finance 2,839,363 — — 2,813,761 2,813,761 Other 19,854 — — 18,517 18,517 Allowance for loan losses (1) (167,703 ) — — — — Securitization receivable (2) 19,242 — — 18,702 18,702 Total financial instrument assets $ 17,088,880 $ — $ 247,357 $ 16,913,293 $ 17,160,650 Financial instrument liabilities: Deposits $ 18,697,672 $ 13,702,036 $ 5,031,743 $ — $ 18,733,779 Long-term borrowings 1,457,976 — 1,461,557 — 1,461,557 Total financial instrument liabilities $ 20,155,648 $ 13,702,036 $ 6,493,300 $ — $ 20,195,336 Financial instruments with off-balance sheet risk: (3) Commitments to extend credit $ 19,081 $ — $ 19,081 $ — $ 19,081 Standby letters of credit (64 ) — (64 ) — (64 ) Total financial instruments with off-balance sheet risk $ 19,017 $ — $ 19,017 $ — $ 19,017 (1) Expected credit losses are included in the estimated fair values. (2) Carrying amounts are included in other assets. (3) Positive amounts represent assets, negative amounts represent liabilities. Carrying Amount Estimated Fair Value at December 31, 2017 (In thousands) Level 1 Level 2 Level 3 Total Financial instrument assets: Investments $ 82,644 $ — $ 82,644 $ — $ 82,644 Debt securities held to maturity 161,576 — 162,826 2,800 165,626 Loans held for sale 134,752 — — 139,458 139,458 Loans: Consumer real estate 4,819,696 — — 4,916,475 4,916,475 Commercial real estate 2,751,285 — — 2,710,237 2,710,237 Commercial business 809,908 — — 776,989 776,989 Equipment finance 2,300,479 — — 2,260,692 2,260,692 Inventory finance 2,739,754 — — 2,723,045 2,723,045 Auto finance 3,199,639 — — 3,197,794 3,197,794 Other 22,517 — — 21,129 21,129 Allowance for loan losses (1) (171,041 ) — — — — Securitization receivable (2) 19,179 — — 18,595 18,595 Total financial instrument assets $ 16,870,388 $ — $ 245,470 $ 16,767,214 $ 17,012,684 Financial instrument liabilities: Deposits $ 18,335,002 $ 13,352,731 $ 5,023,526 $ — $ 18,376,257 Long-term borrowings 1,249,449 — 1,255,333 — 1,255,333 Total financial instrument liabilities $ 19,584,451 $ 13,352,731 $ 6,278,859 $ — $ 19,631,590 Financial instruments with off-balance sheet risk: (3) Commitments to extend credit $ 19,423 $ — $ 19,423 $ — $ 19,423 Standby letters of credit (83 ) — (83 ) — (83 ) Total financial instruments with off-balance sheet risk $ 19,340 $ — $ 19,340 $ — $ 19,340 (1) Expected credit losses are included in the estimated fair values. (2) Carrying amounts are included in other assets. (3) Positive amounts represent assets, negative amounts represent liabilities.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share The computations of basic and diluted earnings per common share were as follows: Quarter Ended March 31, (Dollars in thousands, except per share data) 2018 2017 Basic Earnings Per Common Share: Net income attributable to TCF Financial Corporation $ 73,761 $ 46,278 Preferred stock dividends 4,106 4,847 Impact of preferred stock redemption (1) 3,481 — Net income available to common stockholders 66,174 41,431 Less: Earnings allocated to participating securities 9 8 Earnings allocated to common stock $ 66,165 $ 41,423 Weighted-average common shares outstanding for basic earnings per common share 168,507,448 167,902,615 Basic earnings per common share $ 0.39 $ 0.25 Diluted Earnings Per Common Share: Earnings allocated to common stock $ 66,165 $ 41,423 Weighted-average common shares outstanding used in basic earnings per common share calculation 168,507,448 167,902,615 Net dilutive effect of: Non-participating restricted stock 721,353 436,442 Stock options 8,278 41,626 Warrants 760,067 149,051 Weighted-average common shares outstanding for diluted earnings per common share 169,997,146 168,529,734 Diluted earnings per common share $ 0.39 $ 0.25 (1) Represents the amount of deferred stock issuance costs originally recorded in preferred stock upon the issuance of the Series B Preferred Stock that were reclassified to retained earnings on March 1, 2018, as the Company redeemed all outstanding Series B Preferred Stock. For the first quarter of 2018 and 2017 , there were 0.6 million and 0.5 million ,respectively, of outstanding shares related to non-participating restricted stock that were not included in the computation of diluted earnings per common share because they were anti-dilutive.

Other Non-interest Expense

Other Non-interest Expense	3 Months Ended
	Mar. 31, 2018
Other Income and Expenses [Abstract]
Other Non-interest Expense	Other Non-interest Expense Other non-interest expense was as follows: Quarter Ended March 31, (In thousands) 2018 2017 Advertising and marketing $ 7,297 $ 6,406 Professional fees 5,321 7,193 Outside processing 5,236 4,481 Card processing and issuance costs 4,457 4,109 FDIC insurance 4,070 3,959 Loan and lease processing 3,587 6,181 Severance 2,091 6,633 Other 26,760 25,254 Total other non-interest expense $ 58,819 $ 64,216

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Business Segments	Business Segments The Company's reportable segments are Consumer Banking, Wholesale Banking and Enterprise Services. Consumer Banking is comprised of all of the Company's consumer-facing businesses and includes retail banking, consumer real estate and auto finance. Wholesale Banking is comprised of commercial banking, leasing and equipment finance, and inventory finance. Enterprise Services is comprised of (i) corporate treasury, which includes TCF's investment and borrowing portfolios and management of capital, debt and market risks; (ii) corporate functions, such as information technology, risk and credit management, bank operations, finance, investor relations, corporate development, internal audit, legal and human capital management that provide services to the operating segments; (iii) the Holding Company and (iv) eliminations. TCF evaluates performance and allocates resources based on each reportable segment's net income or loss. The reportable business segments follow GAAP as described in Note 1 . Basis of Presentation , in Item 8. of TCF's 2017 Annual Report on Form 10-K, except for the accounting for intercompany interest income and interest expense, which are eliminated in consolidation, and presenting net interest income on a fully tax-equivalent basis. TCF generally accounts for inter-segment sales and transfers at cost. Certain information for each of TCF's reportable segments, including reconciliations of TCF's consolidated totals, was as follows: (In thousands) Consumer Banking Wholesale Banking Enterprise Services Consolidated At or For the Quarter Ended March 31, 2018: Interest income: Loans and leases $ 109,760 $ 151,525 $ (910 ) $ 260,375 Debt securities available for sale — — 10,123 10,123 Debt securities held to maturity — 23 996 1,019 Loans held for sale and other 2,057 21 1,667 3,745 Funds transfer pricing - credits 96,582 7,748 (104,330 ) — Total interest income 208,399 159,317 (92,454 ) 275,262 Interest expense: Deposits 17,855 1,434 3,221 22,510 Borrowings 12,407 17,398 (20,252 ) 9,553 Funds transfer pricing - charges 38,229 44,885 (83,114 ) — Total interest expense 68,491 63,717 (100,145 ) 32,063 Net interest income 139,908 95,600 7,691 243,199 Provision for credit losses 8,889 2,479 — 11,368 Net interest income after provision for credit losses 131,019 93,121 7,691 231,831 Non-interest income: Fees and service charges 28,597 2,154 — 30,751 Card revenue 13,750 9 — 13,759 ATM revenue 4,649 1 — 4,650 Subtotal 46,996 2,164 — 49,160 Gains on sales of consumer real estate loans, net 9,123 — — 9,123 Servicing fee income 7,926 369 — 8,295 Subtotal 17,049 369 — 17,418 Leasing and equipment finance — 41,847 — 41,847 Other 3,065 607 44 3,716 Fees and other revenue 67,110 44,987 44 112,141 Gains (losses) on debt securities, net — 63 — 63 Total non-interest income 67,110 45,050 44 112,204 Non-interest expense: Compensation and employee benefits 55,230 24,288 44,322 123,840 Occupancy and equipment 25,868 4,907 9,739 40,514 Other 76,100 28,645 (45,926 ) 58,819 Subtotal 157,198 57,840 8,135 223,173 Operating lease depreciation — 17,274 — 17,274 Foreclosed real estate and repossessed assets, net 4,259 650 7 4,916 Other credit costs, net 9 608 — 617 Total non-interest expense 161,466 76,372 8,142 245,980 Income (loss) before income tax expense (benefit) 36,663 61,799 (407 ) 98,055 Income tax expense (benefit) 8,823 13,877 (1,069 ) 21,631 Income after income tax expense (benefit) 27,840 47,922 662 76,424 Income attributable to non-controlling interest — 2,663 — 2,663 Preferred stock dividends — — 4,106 4,106 Impact of preferred stock redemption — — 3,481 3,481 Net income (loss) available to common stockholders $ 27,840 $ 45,259 $ (6,925 ) $ 66,174 Revenues from external customers: Interest income $ 111,817 $ 150,659 $ 12,786 $ 275,262 Non-interest income 67,110 45,050 44 112,204 Total $ 178,927 $ 195,709 $ 12,830 $ 387,466 Total assets $ 8,325,213 $ 12,293,798 $ 2,766,041 $ 23,385,052 (In thousands) Consumer Banking Wholesale Banking Enterprise Services Consolidated At or For the Quarter Ended March 31, 2017: Interest income: Loans and leases $ 97,233 $ 123,726 $ (1,411 ) $ 219,548 Debt securities available for sale — — 7,980 7,980 Debt securities held to maturity — 28 1,252 1,280 Loans held for sale and other 12,600 22 877 13,499 Funds transfer pricing - credits 87,882 5,357 (93,239 ) — Total interest income 197,715 129,133 (84,541 ) 242,307 Interest expense: Deposits 12,042 325 1,348 13,715 Borrowings 11,083 9,932 (14,537 ) 6,478 Funds transfer pricing - charges 34,273 31,234 (65,507 ) — Total interest expense 57,398 41,491 (78,696 ) 20,193 Net interest income (expense) 140,317 87,642 (5,845 ) 222,114 Provision for credit losses 5,351 6,842 — 12,193 Net interest income (expense) after provision for credit losses 134,966 80,800 (5,845 ) 209,921 Non-interest income: Fees and service charges 29,509 1,773 — 31,282 Card revenue 13,150 — — 13,150 ATM revenue 4,675 — — 4,675 Subtotal 47,334 1,773 — 49,107 Gains on sales of auto loans, net 2,864 — — 2,864 Gains on sales of consumer real estate loans, net 8,891 — — 8,891 Servicing fee income 11,313 338 — 11,651 Subtotal 23,068 338 — 23,406 Leasing and equipment finance — 28,298 — 28,298 Other 2,360 310 33 2,703 Fees and other revenue 72,762 30,719 33 103,514 Total non-interest income 72,762 30,719 33 103,514 Non-interest expense: Compensation and employee benefits 61,220 22,433 40,645 124,298 Occupancy and equipment 25,668 4,896 9,036 39,600 Other 78,796 26,227 (40,807 ) 64,216 Subtotal 165,684 53,556 8,874 228,114 Operating lease depreciation — 11,242 — 11,242 Foreclosed real estate and repossessed assets, net 3,579 688 282 4,549 Other credit costs, net 25 76 — 101 Total non-interest expense 169,288 65,562 9,156 244,006 Income (loss) before income tax expense (benefit) 38,440 45,957 (14,968 ) 69,429 Income tax expense (benefit) 13,510 15,068 (7,735 ) 20,843 Income (loss) after income tax expense (benefit) 24,930 30,889 (7,233 ) 48,586 Income attributable to non-controlling interest — 2,308 — 2,308 Preferred stock dividends — — 4,847 4,847 Net income (loss) available to common stockholders $ 24,930 $ 28,581 $ (12,080 ) $ 41,431 Revenues from external customers: Interest income $ 109,833 $ 122,365 $ 10,109 $ 242,307 Non-interest income 72,762 30,719 33 103,514 Total $ 182,595 $ 153,084 $ 10,142 $ 345,821 Total assets $ 8,876,967 $ 10,845,817 $ 2,113,784 $ 21,836,568

Litigation Contingencies

Litigation Contingencies	3 Months Ended
	Mar. 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 ("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. Except as discussed below, 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 ("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. In its complaint, the CFPB seeks, among other relief, redress for consumers, injunctive relief and unspecified penalties. 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. The Court did not grant TCF Bank's motion to dismiss CFPA claims for periods on or after July 21, 2011. TCF Bank rejects the claims made by the CFPB in its complaint and intends to continue to vigorously defend against the CFPB's allegations. TCF has not accrued any amounts with respect to this matter because (i) TCF does not believe a loss is probable, (ii) TCF believes the Company has meritorious defenses to the claims made and (iii) the damages sought are unspecified and uncertain. Therefore, TCF is currently unable to reasonably estimate a range of potential loss, if any, relating to this matter. There is no assurance that the ultimate resolution of this lawsuit will not have a material adverse effect on the consolidated financial position, operating results or cash flows of TCF.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The components of other comprehensive income (loss), reclassifications from accumulated other comprehensive income (loss) to various financial statement line items and the related tax effects were as follows: Quarter Ended March 31, 2018 2017 (In thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Net unrealized gains (losses) on debt securities available for sale and interest-only strips: Net unrealized gains (losses) arising during the period $ (37,892 ) $ 9,538 $ (28,354 ) $ 4,162 $ (1,582 ) $ 2,580 Reclassification of net (gains) losses from accumulated other comprehensive income (loss) to: Total interest income 276 (69 ) 207 48 (18 ) 30 Other non-interest expense 437 (109 ) 328 257 (98 ) 159 Amounts reclassified from accumulated other comprehensive income (loss) 713 (178 ) 535 305 (116 ) 189 Net unrealized gains (losses) on debt securities available for sale and interest-only strips (37,179 ) 9,360 (27,819 ) 4,467 (1,698 ) 2,769 Net unrealized gains (losses) on net investment hedges 2,137 (533 ) 1,604 (504 ) 191 (313 ) Foreign currency translation adjustment (1) (2,110 ) — (2,110 ) 581 — 581 Recognized postretirement prior service cost: Reclassification of amortization of prior service cost to Other non-interest expense (12 ) 3 (9 ) (12 ) 5 (7 ) Total other comprehensive income (loss) $ (37,164 ) $ 8,830 $ (28,334 ) $ 4,532 $ (1,502 ) $ 3,030 (1) Foreign investments are deemed to be permanent in nature and, therefore, TCF does not provide for taxes on foreign currency translation adjustments. The components of accumulated other comprehensive income (loss) were as follows: (In thousands) Net Unrealized Gains (Losses) on Debt Securities Available for Sale and Interest-only Strips Net Unrealized Gains (Losses) on Net Investment Hedges Foreign Currency Translation Adjustment Recognized Postretirement Prior Service Cost Total At or For the Quarter Ended March 31, 2018: Balance, beginning of period $ (16,353 ) $ 4,536 $ (6,843 ) $ 143 $ (18,517 ) Other comprehensive income (loss) (28,354 ) 1,604 (2,110 ) — (28,860 ) Amounts reclassified from accumulated other comprehensive income (loss) 535 — — (9 ) 526 Net other comprehensive income (loss) (27,819 ) 1,604 (2,110 ) (9 ) (28,334 ) Balance, end of period $ (44,172 ) $ 6,140 $ (8,953 ) $ 134 $ (46,851 ) At or For the Quarter Ended March 31, 2017: Balance, beginning of period $ (28,601 ) $ 6,493 $ (11,764 ) $ 147 $ (33,725 ) Other comprehensive income (loss) 2,580 (313 ) 581 — 2,848 Amounts reclassified from accumulated other comprehensive income (loss) 189 — — (7 ) 182 Net other comprehensive income (loss) 2,769 (313 ) 581 (7 ) 3,030 Balance, end of period $ (25,832 ) $ 6,180 $ (11,183 ) $ 140 $ (30,695 )

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business	TCF Financial Corporation (together with its direct and indirect subsidiaries, "we," "us," "our," "TCF" or the "Company"), a Delaware corporation, is a national bank holding company based in Wayzata, Minnesota. References herein to "TCF Financial" or the "Holding Company" refer to TCF Financial Corporation on an unconsolidated basis. Its principal subsidiary, TCF National Bank ("TCF Bank"), is headquartered in Sioux Falls, South Dakota. TCF Bank operates bank branches in Illinois, Minnesota, Michigan, Colorado, Wisconsin, Arizona and South Dakota (TCF's primary banking markets). Through its direct subsidiaries, TCF Bank provides a full range of consumer facing and commercial services, including providing consumer banking services, commercial banking services, commercial leasing and equipment financing and commercial inventory financing.
Principles of Consolidation	The accompanying unaudited consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles ("GAAP") for interim financial information and in accordance with the instructions to Quarterly Report on Form 10-Q and Article 10 of Regulation S-X as promulgated by the Securities and Exchange Commission. Accordingly, the consolidated financial statements do not include all of the information and notes necessary for complete financial statements in conformity with GAAP. The information in this Quarterly Report on Form 10-Q is written with the presumption that the users of the interim financial statements have read or have access to the Company's most recent Annual Report on Form 10-K, which contains the latest audited financial statements and notes thereto, together with Management's Discussion and Analysis of Financial Condition and Results of Operations at December 31, 2017 , and for the year then ended. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain reclassifications have been made to prior period financial statements to conform to current period presentation. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. These estimates are based on information available to management at the time the estimates are made. Actual results could differ from those estimates. In the opinion of management, the accompanying unaudited consolidated financial statements contain all the significant adjustments, consisting of normal recurring items, considered necessary for fair presentation. The results of operations for interim periods are not necessarily indicative of the results to be expected for the entire year.

Summary of Significant Accoun27

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
New Accounting Pronouncements Adopted	Effective January 1, 2018, the Company adopted Accounting Standards Update ("ASU") No. 2017-12: Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities , which expands hedge accounting for nonfinancial and financial risk components and amends measurement methodologies to more closely align hedge accounting with a company’s risk management activities. The ASU decreases the complexity of preparing and understanding hedge results through measurement and reporting of hedge ineffectiveness. In addition, disclosures have been enhanced and the presentation of hedged results changed to align the effects of the hedging instrument and the hedged item. The adoption of this ASU was on a modified retrospective basis and resulted in the Company recording a cumulative effect reduction to the opening balance of retained earnings of $116 thousand . Effective January 1, 2018, the Company adopted ASU No. 2017-09: Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting , which provides guidance about which changes to the terms and conditions of a share-based payment award requires an entity to apply modification accounting in Topic 718. The adoption of this ASU was on a prospective basis and will be applicable to an award modified on or after January 1, 2018. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2017-07: Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost , which changes how employers that sponsor defined benefit pension and/or other postretirement benefit plans present the net periodic benefit cost in the income statement. Under the new guidance, employers present the service cost component of the net periodic benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. Only the service cost component is eligible for capitalization in assets. The other components of net periodic benefit cost are presented separately from the line item that includes service cost and outside of any subtotal of operating income. In addition, disclosure of the line items used to present the other components of net periodic benefit cost is required if the components are not presented separately in the income statement. The adoption of this ASU was on a modified retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2017-05: Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets , which provides guidance for recognizing gains and losses from the transfer of nonfinancial assets in contracts with non-customers. The ASU also clarifies that Accounting Standards Codification 610-20 applies to the derecognition of nonfinancial assets and in substance nonfinancial assets unless other specific guidance applies or the sale is to a customer. The guidance does not apply to the derecognition of businesses, nonprofit activities, financial assets, including equity method investments, or to revenue contracts with customers. The adoption of this ASU was on a modified retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business , which clarifies the definition of a business with the objective of adding guidance to assist companies with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The ASU provides a more robust framework to use in determining when a set of assets and activities is a business. The adoption of this ASU was on a prospective basis. TCF will evaluate future transactions to determine if they should be accounted for as acquisitions (or disposals) of assets or businesses. Effective January 1, 2018, the Company adopted ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash , which requires entities to show changes in the total of cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. As a result, entities no longer present transfers between cash and cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. The adoption of this ASU was on a retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2016-17, Consolidation (Topic 810): Interests Held through Related Parties That Are under Common Control , which changes the way in which a single decision maker considers indirect interests when performing the primary beneficiary analysis under the variable interest model. Under the amended guidance, indirect interests held by a related party would be considered on a proportional basis. The adoption of this ASU was on a retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory , which requires the income tax effects of intercompany sales and transfers of assets, other than inventory, to be recognized in the period the transaction occurs. The adoption of this ASU was on a modified retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments , which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain types of cash receipts and cash payments are presented in the statement of cash flows. The adoption of this ASU was on a retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2016-04, Liabilities - Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products , which requires issuers of prepaid stored-value products redeemable for goods, services or cash at third-party merchants to derecognize liabilities related to those products for breakage. The adoption of this ASU was on a modified retrospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities and ASU No. 2018-03, Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , which amend the classification and measurement of investments in equity securities, simplify the impairment analysis of equity investments without readily determinable fair values, require separate presentation of certain fair value changes for financial liabilities measured at fair value and eliminate certain disclosure requirements associated with the fair value of financial instruments. The adoption of these ASUs was on a prospective basis. The adoption of this guidance did not have a material impact on our consolidated financial statements. Effective January 1, 2018, the Company adopted the following ASUs using the modified retrospective method with no cumulative-effect adjustment to opening retained earnings: ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606); ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date; ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net); ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing; ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients; ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers; ASU No. 2017-13 , Revenue Recognition (Topic 605), Revenue from Contracts with Customers (Topic 606), Leases (Topic 840), and Leases (Topic 842): Amendments to SEC Paragraphs and ASU No. 2017-14, Income Statement - Reporting Comprehensive Income (Topic 220), Revenue Recognition (Topic 605), and Revenue from Contracts with Customers (Topic 606) . TCF derives a majority of its revenue from loans and leases, as well as any related servicing fee revenue, which are not within the scope of these ASUs. These ASUs are applicable to most of the fees and service charges, card and ATM revenue earned by TCF, as well as the gains on sales of certain non-financial assets. However, the recognition of these revenue streams does not change in a significant manner as a result of the adoption of these ASUs. The majority of this revenue is both charged to the customer and earned either at a point in time or on a transactional basis. As a result, the revenue expected to be recognized in any future year related to remaining performance obligations, contracts where revenue is recognized when invoiced and contracts with variable consideration related to undelivered performance obligations are not material. In addition, receivables related to fees and service charges and the related bad debt expense are not material. There are no material contract assets, contract liabilities or deferred contract costs recorded in the Company's Consolidated Statements of Financial Condition. As a significant majority of the Company's revenue streams are not included in the scope of these ASUs and the recognition of revenue for the revenue streams within the scope of these ASUs are not significantly changed, the adoption of this guidance did not have a material impact on the Company's consolidated financial statements.

Debt Securities Available for28

Debt Securities Available for Sale and Debt Securities Held to Maturity (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of Debt Securities	Debt securities were as follows: At March 31, 2018 At December 31, 2017 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt securities available for sale: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ 1,171,513 $ 553 $ 30,414 $ 1,141,652 $ 908,189 $ 308 $ 13,812 $ 894,685 Other 5 — — 5 6 — — 6 Obligations of states and political subdivisions 830,296 342 18,049 812,589 810,159 7,967 3,799 814,327 Total debt securities available for sale $ 2,001,814 $ 895 $ 48,463 $ 1,954,246 $ 1,718,354 $ 8,275 $ 17,611 $ 1,709,018 Debt securities held to maturity: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ 155,299 $ 1,408 $ 1,011 $ 155,696 $ 158,776 $ 4,462 $ 412 $ 162,826 Other securities 2,800 — — 2,800 2,800 — — 2,800 Total debt securities held to maturity $ 158,099 $ 1,408 $ 1,011 $ 158,496 $ 161,576 $ 4,462 $ 412 $ 165,626
Schedule of Gross Unrealized Losses and Fair Value of Debt Securities Available for Sale and Debt Securities Held to Maturity that are in a Loss Position	Gross unrealized losses and fair value of debt securities available for sale and debt securities held to maturity aggregated by investment category and the length of time the securities were in a continuous loss position were as follows: At March 31, 2018 Less than 12 months 12 months or more Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Debt securities available for sale: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ 565,752 $ 12,193 $ 406,236 $ 18,221 $ 971,988 $ 30,414 Obligations of states and political subdivisions 528,645 9,266 200,911 8,783 729,556 18,049 Total debt securities available for sale $ 1,094,397 $ 21,459 $ 607,147 $ 27,004 $ 1,701,544 $ 48,463 Debt securities held to maturity: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ 24,530 $ 489 $ 11,576 $ 522 $ 36,106 $ 1,011 Total debt securities held to maturity $ 24,530 $ 489 $ 11,576 $ 522 $ 36,106 $ 1,011 At December 31, 2017 Less than 12 months 12 months or more Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Debt securities available for sale: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ 406,298 $ 2,686 $ 428,585 $ 11,126 $ 834,883 $ 13,812 Obligations of states and political subdivisions 103,759 486 207,516 3,313 311,275 3,799 Total debt securities available for sale $ 510,057 $ 3,172 $ 636,101 $ 14,439 $ 1,146,158 $ 17,611 Debt securities held to maturity: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ 13,309 $ 132 $ 11,470 $ 280 $ 24,779 $ 412 Total debt securities held to maturity $ 13,309 $ 132 $ 11,470 $ 280 $ 24,779 $ 412
Schedule of Amortized Cost and Fair Value of Debt Securities Available for Sale and Debt Securities Held to Maturity by Contractual Maturity	The amortized cost and fair value of debt securities available for sale and debt securities held to maturity by final contractual maturity were as follows. The remaining contractual principal maturities do not consider possible prepayments. Remaining expected maturities will differ from contractual maturities because borrowers may have the right to prepay. At March 31, 2018 At December 31, 2017 (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Debt securities available for sale: Due in one year or less $ 5 $ 5 $ 6 $ 6 Due in 1-5 years 29,294 29,201 15,178 15,312 Due in 5-10 years 558,110 547,706 514,336 517,867 Due after 10 years 1,414,405 1,377,334 1,188,834 1,175,833 Total debt securities available for sale $ 2,001,814 $ 1,954,246 $ 1,718,354 $ 1,709,018 Debt securities held to maturity: Due in one year or less $ 1,000 $ 1,000 $ 1,000 $ 1,000 Due in 1-5 years 1,400 1,400 1,400 1,400 Due in 5-10 years 418 421 400 400 Due after 10 years 155,281 155,675 158,776 162,826 Total debt securities held to maturity $ 158,099 $ 158,496 $ 161,576 $ 165,626
Interest Income Attributable to Debt Securities Available for Sale	Interest income attributable to debt securities available for sale was as follows: Quarter Ended March 31, (In thousands) 2018 2017 Taxable interest income $ 5,813 $ 4,654 Tax-exempt interest income 4,310 3,326 Total interest income $ 10,123 $ 7,980

Loans and Leases (Tables)

Loans and Leases (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Information about Loans and Leases	Loans and leases were as follows: (In thousands) At March 31, 2018 At December 31, 2017 Consumer real estate: First mortgage lien $ 1,878,441 $ 1,959,387 Junior lien 2,843,221 2,860,309 Total consumer real estate 4,721,662 4,819,696 Commercial: Commercial real estate: Permanent 2,445,780 2,385,752 Construction and development 363,672 365,533 Total commercial real estate 2,809,452 2,751,285 Commercial business 868,729 809,908 Total commercial 3,678,181 3,561,193 Leasing and equipment finance 4,666,239 4,761,661 Inventory finance 3,457,855 2,739,754 Auto finance 2,839,363 3,199,639 Other 19,854 22,517 Total loans and leases (1) $ 19,383,154 $ 19,104,460 (1) Loans and leases are reported at historical cost including net direct fees and costs associated with originating and acquiring loans and leases, lease residuals, unearned income and unamortized purchase premiums and discounts. The aggregate amount of these loan and lease adjustments was $22.0 million and $33.3 million at March 31, 2018 and December 31, 2017 , respectively.
Interest-only Strips and Contractual Liabilites	Total interest-only strips and the contractual liabilities related to loan sales were as follows: (In thousands) At March 31, 2018 At December 31, 2017 Interest-only strips attributable to: Consumer real estate loan sales $ 18,099 $ 16,440 Auto finance loan sales 3,752 4,946 Total interest-only strips $ 21,851 $ 21,386 Contractual liabilities attributable to: Consumer real estate loan sales $ 990 $ 1,234

Allowance for Loan and Lease 30

Allowance for Loan and Lease Losses and Credit Quality Information (Tables)	3 Months Ended
	Mar. 31, 2018
Allowance for Loan and Lease Losses and Credit Quality Information
Rollforwards of the Allowance for Loan and Lease Losses	The rollforwards of the allowance for loan and lease losses were as follows: (In thousands) Consumer Commercial Leasing and Inventory Auto Other Total At or For the Quarter Ended March 31, 2018: Balance, beginning of period $ 47,168 $ 37,195 $ 22,528 $ 13,233 $ 50,225 $ 692 $ 171,041 Charge-offs (2,154 ) — (1,956 ) (549 ) (13,441 ) (1,765 ) (19,865 ) Recoveries 1,037 14 616 140 2,785 1,122 5,714 Net (charge-offs) recoveries (1,117 ) 14 (1,340 ) (409 ) (10,656 ) (643 ) (14,151 ) Provision for credit losses 2,104 (11 ) 1,996 512 6,253 514 11,368 Other (470 ) — (2 ) (83 ) — — (555 ) Balance, end of period $ 47,685 $ 37,198 $ 23,182 $ 13,253 $ 45,822 $ 563 $ 167,703 At or For the Quarter Ended March 31, 2017: Balance, beginning of period $ 59,448 $ 32,695 $ 21,350 $ 13,932 $ 32,310 $ 534 $ 160,269 Charge-offs (3,452 ) (2,732 ) (2,046 ) (219 ) (8,813 ) (1,640 ) (18,902 ) Recoveries 10,692 65 614 119 1,233 1,090 13,813 Net (charge-offs) recoveries 7,240 (2,667 ) (1,432 ) (100 ) (7,580 ) (550 ) (5,089 ) Provision for credit losses (8,137 ) 3,669 1,386 1,965 12,857 453 12,193 Other (4,700 ) — (47 ) 19 (2,479 ) — (7,207 ) Balance, end of period $ 53,851 $ 33,697 $ 21,257 $ 15,816 $ 35,108 $ 437 $ 160,166
Allowance for Loan and Lease Losses and Balances by Type of Allowance Methodology	The allowance for loan and lease losses and loans and leases outstanding by type of allowance methodology were as follows: At March 31, 2018 (In thousands) Consumer Commercial Leasing and Inventory Auto Other Total Allowance for loan and lease losses: Collectively evaluated for impairment $ 29,591 $ 35,635 $ 18,975 $ 13,065 $ 45,613 $ 562 $ 143,441 Individually evaluated for impairment 18,094 1,563 4,207 188 209 1 24,262 Total $ 47,685 $ 37,198 $ 23,182 $ 13,253 $ 45,822 $ 563 $ 167,703 Loans and leases outstanding: Collectively evaluated for impairment $ 4,579,706 $ 3,642,783 $ 4,629,020 $ 3,454,234 $ 2,828,616 $ 19,850 $ 19,154,209 Individually evaluated for impairment 141,956 35,398 28,136 3,621 10,747 4 219,862 Loans acquired with deteriorated credit quality — — 9,083 — — — 9,083 Total $ 4,721,662 $ 3,678,181 $ 4,666,239 $ 3,457,855 $ 2,839,363 $ 19,854 $ 19,383,154 At December 31, 2017 (In thousands) Consumer Real Estate Commercial Leasing and Equipment Finance Inventory Finance Auto Finance Other Total Allowance for loan and lease losses: Collectively evaluated for impairment $ 28,851 $ 35,635 $ 19,083 $ 12,945 $ 49,900 $ 691 $ 147,105 Individually evaluated for impairment 18,317 1,560 3,445 288 325 1 23,936 Total $ 47,168 $ 37,195 $ 22,528 $ 13,233 $ 50,225 $ 692 $ 171,041 Loans and leases outstanding: Collectively evaluated for impairment $ 4,675,626 $ 3,524,864 $ 4,721,905 $ 2,735,638 $ 3,188,810 $ 22,513 $ 18,869,356 Individually evaluated for impairment 144,070 36,329 27,912 4,116 10,829 4 223,260 Loans acquired with deteriorated credit quality — — 11,844 — — — 11,844 Total $ 4,819,696 $ 3,561,193 $ 4,761,661 $ 2,739,754 $ 3,199,639 $ 22,517 $ 19,104,460
Schedule of Accruing and Non-accruing Loans and Leases	TCF's accruing and non-accrual loans and leases were as follows: At March 31, 2018 (In thousands) Current-59 Days Delinquent and Accruing 60-89 Days Delinquent and Accruing 90 Days or More Delinquent and Accruing Total Accruing Non-accrual Total Consumer real estate: First mortgage lien $ 1,813,418 $ 3,670 $ 578 $ 1,817,666 $ 60,775 $ 1,878,441 Junior lien 2,818,158 1,601 — 2,819,759 23,462 2,843,221 Total consumer real estate 4,631,576 5,271 578 4,637,425 84,237 4,721,662 Commercial: Commercial real estate 2,802,819 — — 2,802,819 6,633 2,809,452 Commercial business 863,961 — — 863,961 4,768 868,729 Total commercial 3,666,780 — — 3,666,780 11,401 3,678,181 Leasing and equipment finance 4,632,004 4,600 584 4,637,188 19,968 4,657,156 Inventory finance 3,454,189 44 1 3,454,234 3,621 3,457,855 Auto finance 2,825,425 4,323 2,416 2,832,164 7,199 2,839,363 Other 19,804 17 31 19,852 2 19,854 Subtotal 19,229,778 14,255 3,610 19,247,643 126,428 19,374,071 Portfolios acquired with deteriorated credit quality 7,907 — 1,176 9,083 — 9,083 Total $ 19,237,685 $ 14,255 $ 4,786 $ 19,256,726 $ 126,428 $ 19,383,154 At December 31, 2017 (In thousands) Current-59 Days Delinquent and Accruing 60-89 Days Delinquent and Accruing 90 Days or More Delinquent and Accruing Total Accruing Non-accrual Total Consumer real estate: First mortgage lien $ 1,892,771 $ 4,073 $ 593 $ 1,897,437 $ 61,950 $ 1,959,387 Junior lien 2,837,767 1,268 — 2,839,035 21,274 2,860,309 Total consumer real estate 4,730,538 5,341 593 4,736,472 83,224 4,819,696 Commercial: Commercial real estate 2,744,500 — — 2,744,500 6,785 2,751,285 Commercial business 809,907 1 — 809,908 — 809,908 Total commercial 3,554,407 1 — 3,554,408 6,785 3,561,193 Leasing and equipment finance 4,726,339 4,272 2,117 4,732,728 17,089 4,749,817 Inventory finance 2,735,430 191 17 2,735,638 4,116 2,739,754 Auto finance 3,183,196 6,078 2,999 3,192,273 7,366 3,199,639 Other 22,506 3 6 22,515 2 22,517 Subtotal 18,952,416 15,886 5,732 18,974,034 118,582 19,092,616 Portfolios acquired with deteriorated credit quality 10,283 361 1,200 11,844 — 11,844 Total $ 18,962,699 $ 16,247 $ 6,932 $ 18,985,878 $ 118,582 $ 19,104,460
Interest Income Recognized on Loans and Leases in Non-accrual Status and Contractual Interest	Interest income recognized on loans and leases in non-accrual status and contractual interest that would have been recorded had the loans and leases performed in accordance with their original contractual terms were as follows: Quarter Ended March 31, (In thousands) 2018 2017 Contractual interest due on non-accrual loans and leases $ 2,927 $ 4,498 Interest income recognized on non-accrual loans and leases 458 1,056 Unrecognized interest income $ 2,469 $ 3,442
Summary of Consumer Real Estate Loans to Customers Involved in Bankruptcy Proceedings	Consumer real estate loans to customers currently involved in ongoing Chapter 7 or Chapter 13 bankruptcy proceedings which have not yet been discharged, dismissed or completed were as follows: (In thousands) At March 31, 2018 At December 31, 2017 Consumer real estate loans to customers in bankruptcy: 0-59 days delinquent and accruing $ 6,589 $ 7,324 Non-accrual 11,845 10,552 Total consumer real estate loans to customers in bankruptcy $ 18,434 $ 17,876
Schedule of TDR Loans	TDR loans were as follows: At March 31, 2018 At December 31, 2017 (In thousands) Accruing TDR Loans Non-accrual TDR Loans Total TDR Loans Accruing TDR Loans Non-accrual TDR Loans Total TDR Loans Consumer real estate $ 87,314 $ 33,531 $ 120,845 $ 88,092 $ 34,282 $ 122,374 Commercial 6,843 4,807 11,650 12,249 83 12,332 Leasing and equipment finance 7,365 1,691 9,056 10,263 1,413 11,676 Inventory finance — 371 371 — 476 476 Auto finance 3,549 5,296 8,845 3,464 5,351 8,815 Other 3 1 4 3 1 4 Total $ 105,074 $ 45,697 $ 150,771 $ 114,071 $ 41,606 $ 155,677
Schedule of Accruing Loans that were Restructured within 12 Months and Defaulted	The following table summarizes the TDR loans that defaulted during the first quarter of 2018 and 2017 , which were modified during the respective reporting period or within one year of the beginning of the respective reporting period. Included in commercial loans that defaulted during the first quarter of 2018 was one commercial loan that was transferred to non-accrual status, compared to three commercial loans that were transferred to non-accrual status during the first quarter of 2017 . Quarter Ended March 31, (In thousands) 2018 2017 Defaulted TDR loan balances modified during the applicable period: (1) Consumer real estate: First mortgage lien $ 1,480 $ 368 Junior lien 28 112 Total consumer real estate 1,508 480 Commercial: Commercial real estate — 6,681 Commercial business 4,697 3,353 Total commercial 4,697 10,034 Leasing and equipment finance — 407 Auto finance 364 302 Defaulted TDR loan balances modified during the applicable period $ 6,569 $ 11,223 (1) The loan balances presented are not materially different than the pre-modification loan balances as TCF's loan modifications generally do not forgive principal amounts.
Information on Impaired Loans	Information on impaired loans was as follows: At March 31, 2018 At December 31, 2017 (In thousands) Unpaid Loan Related Unpaid Loan Related Impaired loans with an allowance recorded: Consumer real estate: First mortgage lien $ 90,065 $ 79,687 $ 13,491 $ 91,624 $ 80,802 $ 13,792 Junior lien 31,763 29,200 4,086 32,327 29,544 4,165 Total consumer real estate 121,828 108,887 17,577 123,951 110,346 17,957 Commercial: Commercial real estate 6,766 6,559 1,000 6,810 6,702 1,000 Commercial business 7,262 7,264 563 7,841 7,841 560 Total commercial 14,028 13,823 1,563 14,651 14,543 1,560 Leasing and equipment finance 16,548 16,548 1,897 17,105 17,105 1,345 Inventory finance 1,185 1,189 188 1,296 1,298 288 Auto finance 961 729 138 1,333 1,016 243 Other 3 4 1 3 4 1 Total impaired loans with an allowance recorded 154,553 141,180 21,364 158,339 144,312 21,394 Impaired loans without an allowance recorded: Consumer real estate: First mortgage lien 12,844 10,397 — 12,898 10,445 — Junior lien 13,777 1,561 — 17,697 1,583 — Total consumer real estate 26,621 11,958 — 30,595 12,028 — Commercial: Commercial real estate 4,483 4,421 — 4,552 4,491 — Commercial business — — — — — — Total commercial 4,483 4,421 — 4,552 4,491 — Inventory finance 2,426 2,432 — 2,810 2,818 — Auto finance 11,376 8,116 — 10,566 7,799 — Other 331 — — 331 — — Total impaired loans without an allowance recorded 45,237 26,927 — 48,854 27,136 — Total impaired loans $ 199,790 $ 168,107 $ 21,364 $ 207,193 $ 171,448 $ 21,394
Average Balance of Impaired Loans and Interest Income Recognized on Impaired Loans	The average loan balance of impaired loans and interest income recognized on impaired loans were as follows: Quarter Ended March 31, 2018 2017 (In thousands) Average Loan Balance Interest Income Recognized Average Loan Balance Interest Income Recognized Impaired loans with an allowance recorded: Consumer real estate: First mortgage lien $ 80,245 $ 654 $ 96,979 $ 725 Junior lien 29,372 305 43,827 446 Total consumer real estate 109,617 959 140,806 1,171 Commercial: Commercial real estate 6,631 — 6,733 16 Commercial business 7,552 86 1,052 48 Total commercial 14,183 86 7,785 64 Leasing and equipment finance 16,826 6 10,620 3 Inventory finance 1,243 23 4,510 52 Auto finance 873 — 5,109 46 Other 4 — 6 — Total impaired loans with an allowance recorded 142,746 1,074 168,836 1,336 Impaired loans without an allowance recorded: Consumer real estate: First mortgage lien 10,421 183 12,342 318 Junior lien 1,572 55 1,883 252 Total consumer real estate 11,993 238 14,225 570 Commercial: Commercial real estate 4,457 58 17,936 174 Commercial business — — 429 — Total commercial 4,457 58 18,365 174 Inventory finance 2,625 57 638 44 Auto finance 7,957 69 2,590 — Total impaired loans without an allowance recorded 27,032 422 35,818 788 Total impaired loans $ 169,778 $ 1,496 $ 204,654 $ 2,124
Schedule of Other Real Estate Owned and Repossessed and Returned Assets	Other real estate owned and repossessed and returned assets were as follows: (In thousands) At March 31, 2018 At December 31, 2017 Other real estate owned $ 17,179 $ 18,225 Repossessed and returned assets 13,248 12,630 Consumer real estate loans in process of foreclosure 21,449 22,622

Long-term Borrowings (Tables)

Long-term Borrowings (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Information about Long-term Borrowings	Long-term borrowings were as follows: At March 31, 2018 At December 31, 2017 (Dollars in thousands) Stated Maturity Amount Stated Rate Amount Stated Rate Federal Home Loan Bank advances 2019 $ — — % $ 600,000 1.40 % - 1.75 % 2020 1,100,000 1.86 % - 2.25 275,000 1.76 - 1.78 Subtotal 1,100,000 875,000 Subordinated bank notes 2022 108,923 6.25 108,867 6.25 2025 148,304 4.60 148,252 4.60 Hedge-related basis adjustment (1) (5,808 ) (2,157 ) Subtotal 251,419 254,962 Discounted lease rentals 2018 36,140 2.73 - 7.95 52,347 2.55 - 7.95 2019 36,042 2.53 - 6.00 34,978 2.53 - 6.00 2020 20,843 2.64 - 6.50 19,736 2.64 - 6.50 2021 10,700 2.88 - 5.49 10,077 2.88 - 5.00 2022 2,829 3.04 - 5.43 2,349 3.04 - 5.43 2023 3 5.40 - 5.40 — — Subtotal 106,557 119,487 Total long-term borrowings $ 1,457,976 $ 1,249,449 (1) Related to subordinated bank notes with a stated maturity of 2025.

Equity (Tables)

Equity (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Schedule of Preferred Stock	Preferred stock was as follows: (In thousands) At March 31, 2018 At December 31, 2017 Series B non-cumulative perpetual preferred stock $ — $ 96,519 Series C non-cumulative perpetual preferred stock 169,302 169,302 Total preferred stock $ 169,302 $ 265,821
Schedule of Treasury Stock and Other	Treasury stock and other were as follows: (In thousands) At March 31, 2018 At December 31, 2017 Treasury stock, at cost $ 67,938 $ 10,265 Shares held in trust for deferred compensation plans, at cost 29,862 30,532 Total $ 97,800 $ 40,797

Regulatory Capital Requiremen33

Regulatory Capital Requirements (Tables)	3 Months Ended
	Mar. 31, 2018
Regulatory Capital Requirements [Abstract]
Schedule of Regulatory Capital Information for TCF and TCF Bank	Regulatory capital information for TCF and TCF Bank was as follows: TCF TCF Bank At March 31, At December 31, At March 31, At December 31, Well-capitalized Standard Minimum Capital Requirement (1) (Dollars in thousands) 2018 2017 2018 2017 Regulatory Capital: Common equity Tier 1 capital $ 2,222,390 $ 2,242,410 $ 2,300,115 $ 2,409,027 Tier 1 capital 2,414,838 2,522,178 2,328,552 2,426,854 Total capital 2,786,637 2,889,323 2,736,257 2,837,374 Regulatory Capital Ratios: Common equity Tier 1 capital ratio 10.57 % 10.79 % 10.94 % 11.59 % 6.50 % 4.50 % Tier 1 risk-based capital ratio 11.49 12.14 11.08 11.68 8.00 6.00 Total risk-based capital ratio 13.26 13.90 13.02 13.65 10.00 8.00 Tier 1 leverage ratio 10.52 11.12 10.14 10.70 5.00 4.00 (1) Excludes capital conservation buffer of 1.875% and 1.25% as of March 31, 2018 and December 31, 2017 .

Stock Compensation (Tables)

Stock Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Restricted Stock Award and Stock Option Transactions	TCF's restricted stock award and stock option transactions under the TCF Financial 2015 Omnibus Incentive Plan ("Omnibus Incentive Plan") and the TCF Financial Incentive Stock Program were as follows: Restricted Stock Awards Stock Options Shares Weighted- average Grant Date Fair Value Shares Weighted- average Remaining Contractual Life in Years Weighted- average Exercise Price Outstanding at December 31, 2017 2,639,663 $ 13.65 366,000 0.06 $ 15.75 Granted 450,795 22.19 — — — Exercised — — (366,000 ) — 15.75 Forfeited/canceled (93,820 ) 14.78 — — — Vested (477,179 ) 10.73 — — — Outstanding at March 31, 2018 2,519,459 15.69 — — — Exercisable at March 31, 2018 N.A. N.A. — — N.A. Not Applicable.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Schedule of Net Periodic Benefit Cost Included in Non-interest Expense for the TCF Cash Balance Pension Plan and Postretirement Plan	The net periodic benefit plan (income) cost included in other non-interest expense for the TCF Cash Balance Pension Plan (the "Pension Plan") and the Postretirement Plan were as follows: Pension Plan Quarter Ended March 31, (In thousands) 2018 2017 Interest cost $ 246 $ 285 Return on plan assets (132 ) (142 ) Net periodic benefit plan (income) cost $ 114 $ 143 Postretirement Plan Quarter Ended March 31, (In thousands) 2018 2017 Interest cost $ 28 $ 34 Amortization of prior service cost (12 ) (12 ) Net periodic benefit plan (income) cost $ 16 $ 22

Derivative Instruments (Tables)

Derivative Instruments (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Derivative Instruments	Derivative instruments were as follows: At March 31, 2018 (In thousands) Notional Amount Gross Amounts Recognized Gross Amounts Offset Net Amount Presented Derivative Assets: Derivatives designated as hedging instruments: Interest rate contract $ 150,000 $ 311 $ (311 ) $ — Total derivative assets designated as hedging instruments 311 (311 ) — Derivatives not designated as hedging instruments: Forward foreign exchange contracts 85,305 218 (218 ) — Interest rate contracts 101,172 704 (176 ) 528 Interest rate lock commitments 37,820 558 — 558 Total derivative assets not designated as hedging instruments 1,480 (394 ) 1,086 Total derivative assets $ 1,791 $ (705 ) $ 1,086 Derivative Liabilities: Derivatives designated as hedging instruments: Forward foreign exchange contracts $ 78,248 $ 291 $ (94 ) $ 197 Total derivative liabilities designated as hedging instruments 291 (94 ) 197 Derivatives not designated as hedging instruments: Forward foreign exchange contracts 241,103 2,214 (2,077 ) 137 Interest rate contracts 576,844 4,799 (388 ) 4,411 Other contracts 13,804 538 (538 ) — Total derivative liabilities not designated as hedging instruments 7,551 (3,003 ) 4,548 Total derivative liabilities $ 7,842 $ (3,097 ) $ 4,745 At December 31, 2017 (In thousands) Notional Gross Amounts Gross Amounts Net Amount Derivative Assets: Derivatives designated as hedging instruments: Interest rate contract $ 150,000 $ 405 $ (405 ) $ — Total derivative assets designated as hedging instruments 405 (405 ) — Derivatives not designated as hedging instruments: Interest rate contracts 169,377 1,392 (52 ) 1,340 Interest rate lock commitments 17,974 223 — 223 Total derivative assets not designated as hedging instruments 1,615 (52 ) 1,563 Total derivative assets $ 2,020 $ (457 ) $ 1,563 Derivative Liabilities: Derivatives designated as hedging instruments: Forward foreign exchange contracts $ 77,879 $ 1,744 $ (1,744 ) $ — Total derivative liabilities designated as hedging instruments 1,744 (1,744 ) — Derivatives not designated as hedging instruments: Forward foreign exchange contracts 330,928 4,619 (4,282 ) 337 Interest rate contracts 423,006 1,688 (457 ) 1,231 Other contracts 13,804 615 (615 ) — Interest rate lock commitments 41 — — — Total derivative liabilities not designated as hedging instruments 6,922 (5,354 ) 1,568 Total derivative liabilities $ 8,666 $ (7,098 ) $ 1,568
Amounts Recorded in the Consolidated Statements of Financial Condition Related to the Cumulative Basis Adjustment for the Fair Value Hedge	As of March 31, 2018 and December 31, 2017 , the following amounts were recorded on the Consolidated Statements of Financial Condition related to the cumulative basis adjustment for the subordinated debt: Line Item in the Consolidated Statement of Financial Condition in Which the Hedged Item is Included Carrying Amount of the Hedged Liability Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Liability (In thousands) At March 31, 2018 At December 31, 2017 At March 31, 2018 At December 31, 2017 Long-term borrowings $ 142,496 $ 146,095 $ (5,808 ) $ (2,157 )
Summary of Gains and Losses Related to the Fair Value of the Interest Rate Swap and the Offsetting Changes in the Fair Value of the Hedged Debt	The gains and losses related to changes in the fair value of the interest rate swap, as well as the offsetting changes in fair value of the hedged debt, were as follows: Quarter Ended March 31, (In thousands) 2018 2017 Total amount presented in the Consolidated Statements of Income in which the effects of the fair value hedge are recorded: Interest expense - borrowings $ 9,553 $ — Other non-interest income — 2,703 Effect of fair value hedge: Income (expense) Hedged item $ 3,806 $ 513 Derivative designated as a hedging instrument (3,858 ) (501 )
Effect of Net Investment Hedges on Accumulated Other Comprehensive Income	The effect of net investment hedges on accumulated other comprehensive income was as follows: Quarter Ended March 31, (In thousands) 2018 2017 Forward foreign exchange contracts $ 2,137 $ (504 )
Summary of Effects of Derivatives not Designated as Hedging Instruments on the Consolidated Statements of Income	Certain other forward foreign exchange contracts and interest rate contracts, along with other contracts and interest rate lock commitments have not been designated as hedging instruments. The effect of these derivatives included in the Consolidated Statements of Income was as follows: Quarter Ended March 31, (In thousands) Location of Gain (Loss) 2018 2017 Forward foreign exchange contracts Other non-interest expense $ 8,944 $ (3,259 ) Interest rate lock commitments Gains on sales of consumer real estate 624 167 Interest rate contracts Other non-interest income 99 (9 ) Net gain (loss) recognized $ 9,667 $ (3,101 )

Fair Values Disclosures (Tables

Fair Values Disclosures (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Balances of Assets and Liabilities Measured at Fair Value on a Recurring and Non-recurring Basis	The balances of assets and liabilities measured at fair value on a recurring and non-recurring basis were as follows: Fair Value Measurements at March 31, 2018 (In thousands) Level 1 Level 2 Level 3 Total Recurring Fair Value Measurements through Net Income: Assets: Loans held for sale $ — $ — $ 9,058 $ 9,058 Forward foreign exchange contracts (1) — 218 — 218 Interest rate contracts (1) — 1,015 — 1,015 Interest rate lock commitments (1) — — 558 558 Forward loan sales commitments — — 182 182 Assets held in trust for deferred compensation plans 29,952 — — 29,952 Total assets $ 29,952 $ 1,233 $ 9,798 $ 40,983 Liabilities: Forward foreign exchange contracts (1) $ — $ 2,214 $ — $ 2,214 Interest rate contracts (1) — 4,799 — 4,799 Other contracts (1) — — 538 538 Forward loan sales commitments — — 38 38 Liabilities held in trust for deferred compensation plans 29,952 — — 29,952 Total liabilities $ 29,952 $ 7,013 $ 576 $ 37,541 Recurring Fair Value Measurements through Other Comprehensive Income: Assets: Debt securities available for sale: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ — $ 1,141,652 $ — $ 1,141,652 Other — — 5 5 Obligations of states and political subdivisions — 812,589 — 812,589 Interest-only strips — — 21,851 21,851 Total assets $ — $ 1,954,241 $ 21,856 $ 1,976,097 Liabilities: Forward foreign exchange contracts (1) $ — $ 291 $ — $ 291 Total liabilities $ — $ 291 $ — $ 291 Non-recurring Fair Value Measurements: Loans $ — $ — $ 76,424 $ 76,424 Other real estate owned: Consumer — — 13,002 13,002 Commercial — — 85 85 Repossessed and returned assets — 4,505 3,579 8,084 Total non-recurring fair value measurements $ — $ 4,505 $ 93,090 $ 97,595 (1) As permitted under GAAP, TCF has elected to net derivative assets and derivative liabilities when a legally enforceable master netting agreement exists as well as the related cash collateral received and paid. For purposes of this table, the derivative assets and derivative liabilities are presented gross of this netting adjustment. Fair Value Measurements at December 31, 2017 (In thousands) Level 1 Level 2 Level 3 Total Recurring Fair Value Measurements through Net Income: Assets: Loans held for sale $ — $ — $ 3,356 $ 3,356 Interest rate contracts (1) — 1,797 — 1,797 Interest rate lock commitments (1) — — 223 223 Forward loan sales commitments — — 68 68 Assets held in trust for deferred compensation plans 29,962 — — 29,962 Total assets $ 29,962 $ 1,797 $ 3,647 $ 35,406 Liabilities: Forward foreign exchange contracts (1) $ — $ 4,619 $ — $ 4,619 Interest rate contracts (1) — 1,688 — 1,688 Other contracts (1) — — 615 615 Forward loan sales commitments — — 5 5 Liabilities held in trust for deferred compensation plans 29,962 — — 29,962 Total liabilities $ 29,962 $ 6,307 $ 620 $ 36,889 Recurring Fair Value Measurements through Other Comprehensive Income: Assets: Debt securities available for sale: Mortgage-backed securities: U.S. Government sponsored enterprises and federal agencies $ — $ 894,685 $ — $ 894,685 Other — — 6 6 Obligations of states and political subdivisions — 814,327 — 814,327 Interest-only strips — — 21,386 21,386 Total assets $ — $ 1,709,012 $ 21,392 $ 1,730,404 Liabilities: Forward foreign exchange contracts (1) $ — $ 1,744 $ — $ 1,744 Total liabilities $ — $ 1,744 $ — $ 1,744 Non-recurring Fair Value Measurements: Loans $ — $ — $ 72,287 $ 72,287 Other real estate owned: Consumer — — 13,951 13,951 Commercial — — 85 85 Repossessed and returned assets — 3,669 4,388 8,057 Total non-recurring fair value measurements $ — $ 3,669 $ 90,711 $ 94,380 (1) As permitted under GAAP, TCF has elected to net derivative assets and derivative liabilities when a legally enforceable master netting agreement exists as well as the related cash collateral received and paid. For purposes of this table, the derivative assets and derivative liabilities are presented gross of this netting adjustment.
Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis	The changes in Level 3 assets and liabilities measured at fair value on a recurring basis were as follows: (In thousands) Debt Securities Loans Interest-only Strips Interest Forward Other Contracts At or For the Quarter Ended March 31, 2018: Asset (liability) balance, beginning of period $ 6 $ 3,356 $ 21,386 $ 223 $ 63 $ (615 ) Total net gains (losses) included in: Net income — 97 331 335 81 — Other comprehensive income (loss) — — 777 — — — Sales — (59,747 ) — — — — Originations — 65,355 3,299 — — — Principal paydowns / settlements (1 ) (3 ) (3,942 ) — — 77 Asset (liability) balance, end of period $ 5 $ 9,058 $ 21,851 $ 558 $ 144 $ (538 ) At or For the Quarter Ended March 31, 2017: Asset (liability) balance, beginning of period $ 18 $ 6,498 $ 40,152 $ 297 $ 361 $ (619 ) Total net gains (losses) included in: Net income — 104 1,113 167 (453 ) — Other comprehensive income (loss) — — (328 ) — — — Sales — (46,714 ) — — — — Originations — 43,479 1,347 — — — Principal paydowns / settlements (4 ) (5 ) (6,501 ) — — 78 Asset (liability) balance, end of period $ 14 $ 3,362 $ 35,783 $ 464 $ (92 ) $ (541 )
Schedule of Differences Between the Aggregate Fair Value and Aggregate Unpaid Principal Balance on Loans Held for Sale	The difference between the aggregate fair value and aggregate unpaid principal balance of these loans held for sale was as follows: (In thousands) At March 31, 2018 At December 31, 2017 Fair value carrying amount $ 9,058 $ 3,356 Aggregate unpaid principal amount 8,911 3,268 Fair value carrying amount less aggregate unpaid principal $ 147 $ 88
Fair Value of Assets and Liabilities, Including Hierarchy Level	The carrying amounts and estimated fair values of the Company's financial instruments, excluding short-term financial assets and liabilities as their carrying amounts approximate fair value, and excluding financial instruments recorded at fair value on a recurring basis, were as follows. This information represents only a portion of TCF's balance sheet and not the estimated value of the Company as a whole. Non-financial instruments such as the intangible value of TCF's branches and core deposits, leasing operations, goodwill, premises and equipment and the future revenues from TCF's customers are not reflected in this disclosure. Therefore, this information is of limited use in assessing the value of TCF. Carrying Amount Estimated Fair Value at March 31, 2018 (In thousands) Level 1 Level 2 Level 3 Total Financial instrument assets: Investments $ 91,661 $ — $ 91,661 $ — $ 91,661 Debt securities held to maturity 158,099 — 155,696 2,800 158,496 Loans held for sale 50,075 — — 51,654 51,654 Loans: Consumer real estate 4,721,662 — — 4,791,418 4,791,418 Commercial real estate 2,809,452 — — 2,757,467 2,757,467 Commercial business 868,729 — — 843,412 843,412 Equipment finance 2,220,591 — — 2,174,558 2,174,558 Inventory finance 3,457,855 — — 3,441,004 3,441,004 Auto finance 2,839,363 — — 2,813,761 2,813,761 Other 19,854 — — 18,517 18,517 Allowance for loan losses (1) (167,703 ) — — — — Securitization receivable (2) 19,242 — — 18,702 18,702 Total financial instrument assets $ 17,088,880 $ — $ 247,357 $ 16,913,293 $ 17,160,650 Financial instrument liabilities: Deposits $ 18,697,672 $ 13,702,036 $ 5,031,743 $ — $ 18,733,779 Long-term borrowings 1,457,976 — 1,461,557 — 1,461,557 Total financial instrument liabilities $ 20,155,648 $ 13,702,036 $ 6,493,300 $ — $ 20,195,336 Financial instruments with off-balance sheet risk: (3) Commitments to extend credit $ 19,081 $ — $ 19,081 $ — $ 19,081 Standby letters of credit (64 ) — (64 ) — (64 ) Total financial instruments with off-balance sheet risk $ 19,017 $ — $ 19,017 $ — $ 19,017 (1) Expected credit losses are included in the estimated fair values. (2) Carrying amounts are included in other assets. (3) Positive amounts represent assets, negative amounts represent liabilities. Carrying Amount Estimated Fair Value at December 31, 2017 (In thousands) Level 1 Level 2 Level 3 Total Financial instrument assets: Investments $ 82,644 $ — $ 82,644 $ — $ 82,644 Debt securities held to maturity 161,576 — 162,826 2,800 165,626 Loans held for sale 134,752 — — 139,458 139,458 Loans: Consumer real estate 4,819,696 — — 4,916,475 4,916,475 Commercial real estate 2,751,285 — — 2,710,237 2,710,237 Commercial business 809,908 — — 776,989 776,989 Equipment finance 2,300,479 — — 2,260,692 2,260,692 Inventory finance 2,739,754 — — 2,723,045 2,723,045 Auto finance 3,199,639 — — 3,197,794 3,197,794 Other 22,517 — — 21,129 21,129 Allowance for loan losses (1) (171,041 ) — — — — Securitization receivable (2) 19,179 — — 18,595 18,595 Total financial instrument assets $ 16,870,388 $ — $ 245,470 $ 16,767,214 $ 17,012,684 Financial instrument liabilities: Deposits $ 18,335,002 $ 13,352,731 $ 5,023,526 $ — $ 18,376,257 Long-term borrowings 1,249,449 — 1,255,333 — 1,255,333 Total financial instrument liabilities $ 19,584,451 $ 13,352,731 $ 6,278,859 $ — $ 19,631,590 Financial instruments with off-balance sheet risk: (3) Commitments to extend credit $ 19,423 $ — $ 19,423 $ — $ 19,423 Standby letters of credit (83 ) — (83 ) — (83 ) Total financial instruments with off-balance sheet risk $ 19,340 $ — $ 19,340 $ — $ 19,340 (1) Expected credit losses are included in the estimated fair values. (2) Carrying amounts are included in other assets. (3) Positive amounts represent assets, negative amounts represent liabilities.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings per Common Share	The computations of basic and diluted earnings per common share were as follows: Quarter Ended March 31, (Dollars in thousands, except per share data) 2018 2017 Basic Earnings Per Common Share: Net income attributable to TCF Financial Corporation $ 73,761 $ 46,278 Preferred stock dividends 4,106 4,847 Impact of preferred stock redemption (1) 3,481 — Net income available to common stockholders 66,174 41,431 Less: Earnings allocated to participating securities 9 8 Earnings allocated to common stock $ 66,165 $ 41,423 Weighted-average common shares outstanding for basic earnings per common share 168,507,448 167,902,615 Basic earnings per common share $ 0.39 $ 0.25 Diluted Earnings Per Common Share: Earnings allocated to common stock $ 66,165 $ 41,423 Weighted-average common shares outstanding used in basic earnings per common share calculation 168,507,448 167,902,615 Net dilutive effect of: Non-participating restricted stock 721,353 436,442 Stock options 8,278 41,626 Warrants 760,067 149,051 Weighted-average common shares outstanding for diluted earnings per common share 169,997,146 168,529,734 Diluted earnings per common share $ 0.39 $ 0.25 (1) Represents the amount of deferred stock issuance costs originally recorded in preferred stock upon the issuance of the Series B Preferred Stock that were reclassified to retained earnings on March 1, 2018, as the Company redeemed all outstanding Series B Preferred Stock.

Other Non-interest Expense (Tab

Other Non-interest Expense (Tables)	3 Months Ended
	Mar. 31, 2018
Other Income and Expenses [Abstract]
Other Non-interest Expense	Other non-interest expense was as follows: Quarter Ended March 31, (In thousands) 2018 2017 Advertising and marketing $ 7,297 $ 6,406 Professional fees 5,321 7,193 Outside processing 5,236 4,481 Card processing and issuance costs 4,457 4,109 FDIC insurance 4,070 3,959 Loan and lease processing 3,587 6,181 Severance 2,091 6,633 Other 26,760 25,254 Total other non-interest expense $ 58,819 $ 64,216

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Reportable Segments, Including a Reconciliation of Consolidated Totals	Certain information for each of TCF's reportable segments, including reconciliations of TCF's consolidated totals, was as follows: (In thousands) Consumer Banking Wholesale Banking Enterprise Services Consolidated At or For the Quarter Ended March 31, 2018: Interest income: Loans and leases $ 109,760 $ 151,525 $ (910 ) $ 260,375 Debt securities available for sale — — 10,123 10,123 Debt securities held to maturity — 23 996 1,019 Loans held for sale and other 2,057 21 1,667 3,745 Funds transfer pricing - credits 96,582 7,748 (104,330 ) — Total interest income 208,399 159,317 (92,454 ) 275,262 Interest expense: Deposits 17,855 1,434 3,221 22,510 Borrowings 12,407 17,398 (20,252 ) 9,553 Funds transfer pricing - charges 38,229 44,885 (83,114 ) — Total interest expense 68,491 63,717 (100,145 ) 32,063 Net interest income 139,908 95,600 7,691 243,199 Provision for credit losses 8,889 2,479 — 11,368 Net interest income after provision for credit losses 131,019 93,121 7,691 231,831 Non-interest income: Fees and service charges 28,597 2,154 — 30,751 Card revenue 13,750 9 — 13,759 ATM revenue 4,649 1 — 4,650 Subtotal 46,996 2,164 — 49,160 Gains on sales of consumer real estate loans, net 9,123 — — 9,123 Servicing fee income 7,926 369 — 8,295 Subtotal 17,049 369 — 17,418 Leasing and equipment finance — 41,847 — 41,847 Other 3,065 607 44 3,716 Fees and other revenue 67,110 44,987 44 112,141 Gains (losses) on debt securities, net — 63 — 63 Total non-interest income 67,110 45,050 44 112,204 Non-interest expense: Compensation and employee benefits 55,230 24,288 44,322 123,840 Occupancy and equipment 25,868 4,907 9,739 40,514 Other 76,100 28,645 (45,926 ) 58,819 Subtotal 157,198 57,840 8,135 223,173 Operating lease depreciation — 17,274 — 17,274 Foreclosed real estate and repossessed assets, net 4,259 650 7 4,916 Other credit costs, net 9 608 — 617 Total non-interest expense 161,466 76,372 8,142 245,980 Income (loss) before income tax expense (benefit) 36,663 61,799 (407 ) 98,055 Income tax expense (benefit) 8,823 13,877 (1,069 ) 21,631 Income after income tax expense (benefit) 27,840 47,922 662 76,424 Income attributable to non-controlling interest — 2,663 — 2,663 Preferred stock dividends — — 4,106 4,106 Impact of preferred stock redemption — — 3,481 3,481 Net income (loss) available to common stockholders $ 27,840 $ 45,259 $ (6,925 ) $ 66,174 Revenues from external customers: Interest income $ 111,817 $ 150,659 $ 12,786 $ 275,262 Non-interest income 67,110 45,050 44 112,204 Total $ 178,927 $ 195,709 $ 12,830 $ 387,466 Total assets $ 8,325,213 $ 12,293,798 $ 2,766,041 $ 23,385,052 (In thousands) Consumer Banking Wholesale Banking Enterprise Services Consolidated At or For the Quarter Ended March 31, 2017: Interest income: Loans and leases $ 97,233 $ 123,726 $ (1,411 ) $ 219,548 Debt securities available for sale — — 7,980 7,980 Debt securities held to maturity — 28 1,252 1,280 Loans held for sale and other 12,600 22 877 13,499 Funds transfer pricing - credits 87,882 5,357 (93,239 ) — Total interest income 197,715 129,133 (84,541 ) 242,307 Interest expense: Deposits 12,042 325 1,348 13,715 Borrowings 11,083 9,932 (14,537 ) 6,478 Funds transfer pricing - charges 34,273 31,234 (65,507 ) — Total interest expense 57,398 41,491 (78,696 ) 20,193 Net interest income (expense) 140,317 87,642 (5,845 ) 222,114 Provision for credit losses 5,351 6,842 — 12,193 Net interest income (expense) after provision for credit losses 134,966 80,800 (5,845 ) 209,921 Non-interest income: Fees and service charges 29,509 1,773 — 31,282 Card revenue 13,150 — — 13,150 ATM revenue 4,675 — — 4,675 Subtotal 47,334 1,773 — 49,107 Gains on sales of auto loans, net 2,864 — — 2,864 Gains on sales of consumer real estate loans, net 8,891 — — 8,891 Servicing fee income 11,313 338 — 11,651 Subtotal 23,068 338 — 23,406 Leasing and equipment finance — 28,298 — 28,298 Other 2,360 310 33 2,703 Fees and other revenue 72,762 30,719 33 103,514 Total non-interest income 72,762 30,719 33 103,514 Non-interest expense: Compensation and employee benefits 61,220 22,433 40,645 124,298 Occupancy and equipment 25,668 4,896 9,036 39,600 Other 78,796 26,227 (40,807 ) 64,216 Subtotal 165,684 53,556 8,874 228,114 Operating lease depreciation — 11,242 — 11,242 Foreclosed real estate and repossessed assets, net 3,579 688 282 4,549 Other credit costs, net 25 76 — 101 Total non-interest expense 169,288 65,562 9,156 244,006 Income (loss) before income tax expense (benefit) 38,440 45,957 (14,968 ) 69,429 Income tax expense (benefit) 13,510 15,068 (7,735 ) 20,843 Income (loss) after income tax expense (benefit) 24,930 30,889 (7,233 ) 48,586 Income attributable to non-controlling interest — 2,308 — 2,308 Preferred stock dividends — — 4,847 4,847 Net income (loss) available to common stockholders $ 24,930 $ 28,581 $ (12,080 ) $ 41,431 Revenues from external customers: Interest income $ 109,833 $ 122,365 $ 10,109 $ 242,307 Non-interest income 72,762 30,719 33 103,514 Total $ 182,595 $ 153,084 $ 10,142 $ 345,821 Total assets $ 8,876,967 $ 10,845,817 $ 2,113,784 $ 21,836,568

Accumulated Other Comprehensi41

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Summary of Components of Other Comprehensive Income (Loss), Reclassifications from Accumulated Cther Comprehensive Income (Loss) to Various Financial Statement Line Items and the Related Tax Effects	The components of other comprehensive income (loss), reclassifications from accumulated other comprehensive income (loss) to various financial statement line items and the related tax effects were as follows: Quarter Ended March 31, 2018 2017 (In thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Net unrealized gains (losses) on debt securities available for sale and interest-only strips: Net unrealized gains (losses) arising during the period $ (37,892 ) $ 9,538 $ (28,354 ) $ 4,162 $ (1,582 ) $ 2,580 Reclassification of net (gains) losses from accumulated other comprehensive income (loss) to: Total interest income 276 (69 ) 207 48 (18 ) 30 Other non-interest expense 437 (109 ) 328 257 (98 ) 159 Amounts reclassified from accumulated other comprehensive income (loss) 713 (178 ) 535 305 (116 ) 189 Net unrealized gains (losses) on debt securities available for sale and interest-only strips (37,179 ) 9,360 (27,819 ) 4,467 (1,698 ) 2,769 Net unrealized gains (losses) on net investment hedges 2,137 (533 ) 1,604 (504 ) 191 (313 ) Foreign currency translation adjustment (1) (2,110 ) — (2,110 ) 581 — 581 Recognized postretirement prior service cost: Reclassification of amortization of prior service cost to Other non-interest expense (12 ) 3 (9 ) (12 ) 5 (7 ) Total other comprehensive income (loss) $ (37,164 ) $ 8,830 $ (28,334 ) $ 4,532 $ (1,502 ) $ 3,030 (1) Foreign investments are deemed to be permanent in nature and, therefore, TCF does not provide for taxes on foreign currency translation adjustments.
Schedule of Components of Accumulated Other Comprehensive Income (Loss)	The components of accumulated other comprehensive income (loss) were as follows: (In thousands) Net Unrealized Gains (Losses) on Debt Securities Available for Sale and Interest-only Strips Net Unrealized Gains (Losses) on Net Investment Hedges Foreign Currency Translation Adjustment Recognized Postretirement Prior Service Cost Total At or For the Quarter Ended March 31, 2018: Balance, beginning of period $ (16,353 ) $ 4,536 $ (6,843 ) $ 143 $ (18,517 ) Other comprehensive income (loss) (28,354 ) 1,604 (2,110 ) — (28,860 ) Amounts reclassified from accumulated other comprehensive income (loss) 535 — — (9 ) 526 Net other comprehensive income (loss) (27,819 ) 1,604 (2,110 ) (9 ) (28,334 ) Balance, end of period $ (44,172 ) $ 6,140 $ (8,953 ) $ 134 $ (46,851 ) At or For the Quarter Ended March 31, 2017: Balance, beginning of period $ (28,601 ) $ 6,493 $ (11,764 ) $ 147 $ (33,725 ) Other comprehensive income (loss) 2,580 (313 ) 581 — 2,848 Amounts reclassified from accumulated other comprehensive income (loss) 189 — — (7 ) 182 Net other comprehensive income (loss) 2,769 (313 ) 581 (7 ) 3,030 Balance, end of period $ (25,832 ) $ 6,180 $ (11,183 ) $ 140 $ (30,695 )

Summary of Significant Accoun42

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in Accounting Principle
Change in accounting principle		$ (116)	$ 0
Retained Earnings
Change in Accounting Principle
Change in accounting principle		$ (116)	$ (1,319)
Accounting Standards Update 2017-12 | Retained Earnings
Change in Accounting Principle
Change in accounting principle	$ 116

Cash and Due from Banks (Detail

Cash and Due from Banks (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
Reserve in cash on hand or at the Federal Reserve as required by Federal Reserve regulations	$ 112.7	$ 107
Total restricted cash balance	35.4	36.5
Cash held in interest-bearing accounts	$ 326.4	$ 324.2

Debt Securities Available for44

Debt Securities Available for Sale and Debt Securities Held to Maturity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Debt securities available for sale:
Amortized Cost	$ 2,001,814,000		$ 1,718,354,000
Gross Unrealized Gains	895,000		8,275,000
Gross Unrealized Losses	(48,463,000)		(17,611,000)
Fair Value	1,954,246,000		1,709,018,000
Debt securities available for sale sold during the period	0	$ 0
Impairment charges on debt securities available for sale	0	0
Debt securities held to maturity:
Amortized Cost	158,099,000		161,576,000
Gross Unrealized Gains	1,408,000		4,462,000
Gross Unrealized Losses	1,011,000		412,000
Fair Value	158,496,000		165,626,000
Debt securities held to maturity sold during the period	0	0
Impairment charges on debt securities held to maturity	0	0
Recoveries on previously impaired debt securities held to maturity	63,000	$ 0
Mortgage-backed securities:
Debt securities available for sale:
Debt securities available for sale pledged as collateral	1,100,000		900,000
Mortgage-backed securities, U.S. Government sponsored enterprises and federal agencies
Debt securities available for sale:
Amortized Cost	1,171,513,000		908,189,000
Gross Unrealized Gains	553,000		308,000
Gross Unrealized Losses	(30,414,000)		(13,812,000)
Fair Value	1,141,652,000		894,685,000
Debt securities held to maturity:
Amortized Cost	155,299,000		158,776,000
Gross Unrealized Gains	1,408,000		4,462,000
Gross Unrealized Losses	1,011,000		412,000
Fair Value	155,696,000		162,826,000
Mortgage-backed securities, Other
Debt securities available for sale:
Amortized Cost	5,000		6,000
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Fair Value	5,000		6,000
Obligations of states and political subdivisions
Debt securities available for sale:
Amortized Cost	830,296,000		810,159,000
Gross Unrealized Gains	342,000		7,967,000
Gross Unrealized Losses	(18,049,000)		(3,799,000)
Fair Value	812,589,000		814,327,000
Other securities
Debt securities held to maturity:
Amortized Cost	2,800,000		2,800,000
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Fair Value	$ 2,800,000		$ 2,800,000

Gross Unrealized Losses and Fai

Gross Unrealized Losses and Fair Value of Debt Securities Available for Sale and Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Gross unrealized losses and fair value of debt securities available for sale that are in a loss position
Less than 12 months, Fair Value	$ 1,094,397	$ 510,057
Less than 12 months, Unrealized Losses	21,459	3,172
12 months or more, Fair Value	607,147	636,101
12 months or more, Unrealized Losses	27,004	14,439
Total, Fair Value	1,701,544	1,146,158
Total, Unrealized Losses	48,463	17,611
Gross unrealized losses and fair value of debt securities held to maturity that are in a loss position
Less than 12 months, Fair Value	24,530	13,309
Less than 12 months, Unrealized Losses	489	132
12 months or more, Fair Value	11,576	11,470
12 months or more, Unrealized Losses	522	280
Total, Fair Value	36,106	24,779
Total, Unrealized Losses	1,011	412
Mortgage-backed securities, U.S. Government sponsored enterprises and federal agencies
Gross unrealized losses and fair value of debt securities available for sale that are in a loss position
Less than 12 months, Fair Value	565,752	406,298
Less than 12 months, Unrealized Losses	12,193	2,686
12 months or more, Fair Value	406,236	428,585
12 months or more, Unrealized Losses	18,221	11,126
Total, Fair Value	971,988	834,883
Total, Unrealized Losses	30,414	13,812
Gross unrealized losses and fair value of debt securities held to maturity that are in a loss position
Less than 12 months, Fair Value	24,530	13,309
Less than 12 months, Unrealized Losses	489	132
12 months or more, Fair Value	11,576	11,470
12 months or more, Unrealized Losses	522	280
Total, Fair Value	36,106	24,779
Total, Unrealized Losses	1,011	412
Obligations of states and political subdivisions
Gross unrealized losses and fair value of debt securities available for sale that are in a loss position
Less than 12 months, Fair Value	528,645	103,759
Less than 12 months, Unrealized Losses	9,266	486
12 months or more, Fair Value	200,911	207,516
12 months or more, Unrealized Losses	8,783	3,313
Total, Fair Value	729,556	311,275
Total, Unrealized Losses	$ 18,049	$ 3,799

Amortized Cost and Fair Value o

Amortized Cost and Fair Value of Debt Securities Available for Sale and Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Amortized cost, debt securities available for sale
Due in one year or less	$ 5	$ 6
Due in 1-5 years	29,294	15,178
Due in 5-10 years	558,110	514,336
Due after 10 years	1,414,405	1,188,834
Amortized Cost	2,001,814	1,718,354
Fair value, debt securities available for sale
Due in one year or less	5	6
Due in 1-5 years	29,201	15,312
Due in 5-10 years	547,706	517,867
Due after 10 years	1,377,334	1,175,833
Fair Value	1,954,246	1,709,018
Amortized cost, debt securities held to maturity
Due in one year or less	1,000	1,000
Due in 1-5 years	1,400	1,400
Due in 5-10 years	418	400
Due after 10 years	155,281	158,776
Amortized Cost	158,099	161,576
Fair value, debt securities held to maturity
Due in one year or less	1,000	1,000
Due in 1-5 years	1,400	1,400
Due in 5-10 years	421	400
Due after 10 years	155,675	162,826
Fair Value	$ 158,496	$ 165,626

Interest Income Attributable to

Interest Income Attributable to Debt Securities Available for Sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest Income on Debt Securities Available for Sale by Taxable Status
Total interest income, securities available for sale	$ 10,123	$ 7,980
Debt securities available for sale
Interest Income on Debt Securities Available for Sale by Taxable Status
Taxable interest income	5,813	4,654
Tax-exempt interest income	4,310	3,326
Total interest income, securities available for sale	$ 10,123	$ 7,980

Loan and Lease Balances (Detail

Loan and Lease Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure
Loans and leases	$ 19,383,154	$ 19,104,460
Loan and lease adjustments	22,000	33,300
Consumer real estate
Loans and Leases Receivable Disclosure
Loans and leases	4,721,662	4,819,696
Consumer real estate | First mortgage lien
Loans and Leases Receivable Disclosure
Loans and leases	1,878,441	1,959,387
Consumer real estate | Junior lien
Loans and Leases Receivable Disclosure
Loans and leases	2,843,221	2,860,309
Commercial
Loans and Leases Receivable Disclosure
Loans and leases	3,678,181	3,561,193
Commercial | Commercial real estate
Loans and Leases Receivable Disclosure
Loans and leases	2,809,452	2,751,285
Commercial | Permanent
Loans and Leases Receivable Disclosure
Loans and leases	2,445,780	2,385,752
Commercial | Construction and development
Loans and Leases Receivable Disclosure
Loans and leases	363,672	365,533
Commercial | Commercial business
Loans and Leases Receivable Disclosure
Loans and leases	868,729	809,908
Leasing and equipment finance
Loans and Leases Receivable Disclosure
Loans and leases	4,666,239	4,761,661
Inventory finance
Loans and Leases Receivable Disclosure
Loans and leases	3,457,855	2,739,754
Auto finance
Loans and Leases Receivable Disclosure
Loans and leases	2,839,363	3,199,639
Other
Loans and Leases Receivable Disclosure
Loans and leases	$ 19,854	$ 22,517

Loan Sales (Details)

Loan Sales (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Consumer real estate
Accounts, Notes, Loans and Financing Receivable
Loans sold during the period	$ 266,300,000	$ 379,400,000
Proceeds from loan sale	272,900,000	399,200,000
Net gains recognized	9,100,000	8,900,000
Interest-only strips retained on consumer loan sales	3,300,000	1,300,000
Consumer real estate non-accrual loans sold		49,400,000
Servicing asset	0		$ 0
Servicing liability	0		0
Auto finance
Accounts, Notes, Loans and Financing Receivable
Loans sold during the period	0	250,600,000
Proceeds from loan sale		254,800,000
Net gains recognized		$ 2,900,000
Servicing asset	0		0
Servicing liability	$ 0		$ 0

Interest-only Strips and Contra

Interest-only Strips and Contractual Liabilities Related to Loan Sales (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable
Interest-only strips	$ 21,851		$ 21,386
Consumer real estate
Accounts, Notes, Loans and Financing Receivable
Interest-only strips	18,099		16,440
Contractual liabilities related to sale of loans	990		1,234
Impairment charges on interest-only strips	268	$ 579
Auto finance
Accounts, Notes, Loans and Financing Receivable
Interest-only strips	3,752		$ 4,946
Impairment charges on interest-only strips	$ 335	$ 24

Rollfowards of the Allowance fo

Rollfowards of the Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance for loan and lease losses
Balance, beginning of period	$ 171,041	$ 160,269
Charge-offs	(19,865)	(18,902)
Recoveries	5,714	13,813
Net (charge-offs) recoveries	(14,151)	(5,089)
Provision for credit losses	11,368	12,193
Other	(555)	(7,207)
Balance, end of period	167,703	160,166
Consumer Real Estate
Allowance for loan and lease losses
Balance, beginning of period	47,168	59,448
Charge-offs	(2,154)	(3,452)
Recoveries	1,037	10,692
Net (charge-offs) recoveries	(1,117)	7,240
Provision for credit losses	2,104	(8,137)
Other	(470)	(4,700)
Balance, end of period	47,685	53,851
Commercial
Allowance for loan and lease losses
Balance, beginning of period	37,195	32,695
Charge-offs	0	(2,732)
Recoveries	14	65
Net (charge-offs) recoveries	14	(2,667)
Provision for credit losses	(11)	3,669
Other	0	0
Balance, end of period	37,198	33,697
Leasing and Equipment Finance
Allowance for loan and lease losses
Balance, beginning of period	22,528	21,350
Charge-offs	(1,956)	(2,046)
Recoveries	616	614
Net (charge-offs) recoveries	(1,340)	(1,432)
Provision for credit losses	1,996	1,386
Other	(2)	(47)
Balance, end of period	23,182	21,257
Inventory Finance
Allowance for loan and lease losses
Balance, beginning of period	13,233	13,932
Charge-offs	(549)	(219)
Recoveries	140	119
Net (charge-offs) recoveries	(409)	(100)
Provision for credit losses	512	1,965
Other	(83)	19
Balance, end of period	13,253	15,816
Auto Finance
Allowance for loan and lease losses
Balance, beginning of period	50,225	32,310
Charge-offs	(13,441)	(8,813)
Recoveries	2,785	1,233
Net (charge-offs) recoveries	(10,656)	(7,580)
Provision for credit losses	6,253	12,857
Other	0	(2,479)
Balance, end of period	45,822	35,108
Other
Allowance for loan and lease losses
Balance, beginning of period	692	534
Charge-offs	(1,765)	(1,640)
Recoveries	1,122	1,090
Net (charge-offs) recoveries	(643)	(550)
Provision for credit losses	514	453
Other	0	0
Balance, end of period	$ 563	$ 437

Allowance for Loan and Lease 52

Allowance for Loan and Lease Losses and Balances Outstanding by Allowance Methodology (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Allowance for loan and lease losses:
Collectively evaluated for impairment	$ 143,441	$ 147,105
Individually evaluated for impairment	24,262	23,936
Total	167,703	171,041	$ 160,166	$ 160,269
Loans and leases outstanding:
Collectively evaluated for impairment	19,154,209	18,869,356
Individually evaluated for impairment	219,862	223,260
Loans acquired with deteriorated credit quality	9,083	11,844
Total loans and leases	19,383,154	19,104,460
Consumer Real Estate
Allowance for loan and lease losses:
Collectively evaluated for impairment	29,591	28,851
Individually evaluated for impairment	18,094	18,317
Total	47,685	47,168	53,851	59,448
Loans and leases outstanding:
Collectively evaluated for impairment	4,579,706	4,675,626
Individually evaluated for impairment	141,956	144,070
Loans acquired with deteriorated credit quality	0	0
Total loans and leases	4,721,662	4,819,696
Commercial
Allowance for loan and lease losses:
Collectively evaluated for impairment	35,635	35,635
Individually evaluated for impairment	1,563	1,560
Total	37,198	37,195	33,697	32,695
Loans and leases outstanding:
Collectively evaluated for impairment	3,642,783	3,524,864
Individually evaluated for impairment	35,398	36,329
Loans acquired with deteriorated credit quality	0	0
Total loans and leases	3,678,181	3,561,193
Leasing and Equipment Finance
Allowance for loan and lease losses:
Collectively evaluated for impairment	18,975	19,083
Individually evaluated for impairment	4,207	3,445
Total	23,182	22,528	21,257	21,350
Loans and leases outstanding:
Collectively evaluated for impairment	4,629,020	4,721,905
Individually evaluated for impairment	28,136	27,912
Loans acquired with deteriorated credit quality	9,083	11,844
Total loans and leases	4,666,239	4,761,661
Inventory Finance
Allowance for loan and lease losses:
Collectively evaluated for impairment	13,065	12,945
Individually evaluated for impairment	188	288
Total	13,253	13,233	15,816	13,932
Loans and leases outstanding:
Collectively evaluated for impairment	3,454,234	2,735,638
Individually evaluated for impairment	3,621	4,116
Loans acquired with deteriorated credit quality	0	0
Total loans and leases	3,457,855	2,739,754
Auto finance
Allowance for loan and lease losses:
Collectively evaluated for impairment	45,613	49,900
Individually evaluated for impairment	209	325
Total	45,822	50,225	35,108	32,310
Loans and leases outstanding:
Collectively evaluated for impairment	2,828,616	3,188,810
Individually evaluated for impairment	10,747	10,829
Loans acquired with deteriorated credit quality	0	0
Total loans and leases	2,839,363	3,199,639
Other
Allowance for loan and lease losses:
Collectively evaluated for impairment	562	691
Individually evaluated for impairment	1	1
Total	563	692	$ 437	$ 534
Loans and leases outstanding:
Collectively evaluated for impairment	19,850	22,513
Individually evaluated for impairment	4	4
Loans acquired with deteriorated credit quality	0	0
Total loans and leases	$ 19,854	$ 22,517

Accruing and Non-accrual Loans

Accruing and Non-accrual Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	$ 19,237,685	$ 18,962,699
60-89 Days Delinquent and Accruing	14,255	16,247
90 Days or More Delinquent and Accruing	4,786	6,932
Total Accruing	19,256,726	18,985,878
Non-accrual	126,428	118,582
Total loans and leases	19,383,154	19,104,460
Portfolios acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	7,907	10,283
60-89 Days Delinquent and Accruing	0	361
90 Days or More Delinquent and Accruing	1,176	1,200
Total Accruing	9,083	11,844
Non-accrual	0	0
Total loans and leases	9,083	11,844
Consumer real estate
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	4,631,576	4,730,538
60-89 Days Delinquent and Accruing	5,271	5,341
90 Days or More Delinquent and Accruing	578	593
Total Accruing	4,637,425	4,736,472
Non-accrual	84,237	83,224
Total loans and leases	4,721,662	4,819,696
Consumer real estate | First mortgage lien
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	1,813,418	1,892,771
60-89 Days Delinquent and Accruing	3,670	4,073
90 Days or More Delinquent and Accruing	578	593
Total Accruing	1,817,666	1,897,437
Non-accrual	60,775	61,950
Total loans and leases	1,878,441	1,959,387
Consumer real estate | Junior lien
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	2,818,158	2,837,767
60-89 Days Delinquent and Accruing	1,601	1,268
90 Days or More Delinquent and Accruing	0	0
Total Accruing	2,819,759	2,839,035
Non-accrual	23,462	21,274
Total loans and leases	2,843,221	2,860,309
Commercial
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	3,666,780	3,554,407
60-89 Days Delinquent and Accruing	0	1
90 Days or More Delinquent and Accruing	0	0
Total Accruing	3,666,780	3,554,408
Non-accrual	11,401	6,785
Total loans and leases	3,678,181	3,561,193
Commercial | Commercial real estate
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	2,802,819	2,744,500
60-89 Days Delinquent and Accruing	0	0
90 Days or More Delinquent and Accruing	0	0
Total Accruing	2,802,819	2,744,500
Non-accrual	6,633	6,785
Total loans and leases	2,809,452	2,751,285
Commercial | Commercial business
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	863,961	809,907
60-89 Days Delinquent and Accruing	0	1
90 Days or More Delinquent and Accruing	0	0
Total Accruing	863,961	809,908
Non-accrual	4,768	0
Total loans and leases	868,729	809,908
Leasing and equipment finance
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	4,632,004	4,726,339
60-89 Days Delinquent and Accruing	4,600	4,272
90 Days or More Delinquent and Accruing	584	2,117
Total Accruing	4,637,188	4,732,728
Non-accrual	19,968	17,089
Total loans and leases	4,657,156	4,749,817
Inventory finance
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	3,454,189	2,735,430
60-89 Days Delinquent and Accruing	44	191
90 Days or More Delinquent and Accruing	1	17
Total Accruing	3,454,234	2,735,638
Non-accrual	3,621	4,116
Total loans and leases	3,457,855	2,739,754
Auto finance
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	2,825,425	3,183,196
60-89 Days Delinquent and Accruing	4,323	6,078
90 Days or More Delinquent and Accruing	2,416	2,999
Total Accruing	2,832,164	3,192,273
Non-accrual	7,199	7,366
Total loans and leases	2,839,363	3,199,639
Other
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	19,804	22,506
60-89 Days Delinquent and Accruing	17	3
90 Days or More Delinquent and Accruing	31	6
Total Accruing	19,852	22,515
Non-accrual	2	2
Total loans and leases	19,854	22,517
Total loans and leases excluding portfolios acquired with deteriorated credit quality
Financing Receivable, Recorded Investment, Past Due
Current-59 Days Delinquent and Accruing	19,229,778	18,952,416
60-89 Days Delinquent and Accruing	14,255	15,886
90 Days or More Delinquent and Accruing	3,610	5,732
Total Accruing	19,247,643	18,974,034
Non-accrual	126,428	118,582
Total loans and leases	$ 19,374,071	$ 19,092,616

Interest Income for Loans and L

Interest Income for Loans and Leases in Non-accrual Status (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Contractual Interest Due and Interest Recognized on Non-accrual Loans
Contractual interest due on non-accrual loans and leases	$ 2,927	$ 4,498
Interest income recognized on non-accrual loans and leases	458	1,056
Unrecognized interest income	$ 2,469	$ 3,442

Consumer Real Estate Loans to C

Consumer Real Estate Loans to Customers in Bankruptcy (Details) - Consumer real estate - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Consumer Real Estate Loans to Customers Involved in Bankruptcy
0-59 days delinquent and accruing	$ 6,589	$ 7,324
Non-accrual	11,845	10,552
Total consumer real estate loans to customers in bankruptcy	$ 18,434	$ 17,876

Loan Modifications to Borrowers

Loan Modifications to Borrowers with Financial Difficulties (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Loan Modifications for Borrowers with Financial Difficulties
Accruing TDR Loans	$ 105,074,000		$ 114,071,000
Non-accrual TDR Loans	45,697,000		41,606,000
Total TDR loans	$ 150,771,000		$ 155,677,000
Delinquency period of performing loans and leases	60 days		60 days
Consumer real estate
Loan Modifications for Borrowers with Financial Difficulties
Accruing TDR Loans	$ 87,314,000		$ 88,092,000
Non-accrual TDR Loans	33,531,000		34,282,000
Total TDR loans	120,845,000		122,374,000
Allowance on accruing TDR loans	$ 16,800,000		$ 17,100,000
Allowance on accruing TDR loans (as a percent)	19.20%		19.40%
Percent of accruing TDR loans more than 60 days delinquent	0.10%		0.50%
Maximum period past due to be considered accruing status for consumer real estate TDR loans	90 days		90 days
Portion of non-accrual TDR balance, loans discharged in Chapter 7 bankruptcy that are not reaffirmed	$ 21,100,000		$ 22,300,000
Portion of non-accrual TDR balance, loans discharged in Chapter 7 bankruptcy that are not reaffirmed (as a percent)	63.00%		65.00%
Portion of non-accrual TDR balance, loans discharged in Chapter 7 bankruptcy that are not reaffirmed, current (as a percent)	72.50%		70.00%
Average yield on TDR loans (as a percent)	4.20%	4.20%
Contractual average rate of TDR loans (as a percent)	6.70%	6.60%
Consumer real estate | First mortgage lien
Loan Modifications for Borrowers with Financial Difficulties
Unrecognized interest income on accruing TDRs	$ 400,000	$ 500,000
Consumer real estate | Junior lien
Loan Modifications for Borrowers with Financial Difficulties
Unrecognized interest income on accruing TDRs	100,000	$ 200,000
Commercial
Loan Modifications for Borrowers with Financial Difficulties
Accruing TDR Loans	6,843,000		$ 12,249,000
Non-accrual TDR Loans	4,807,000		83,000
Total TDR loans	11,650,000		12,332,000
Leasing and equipment finance
Loan Modifications for Borrowers with Financial Difficulties
Accruing TDR Loans	7,365,000		10,263,000
Non-accrual TDR Loans	1,691,000		1,413,000
Total TDR loans	9,056,000		11,676,000
Unfunded commitments to loans classified as TDRs	0		0
Inventory finance
Loan Modifications for Borrowers with Financial Difficulties
Accruing TDR Loans	0		0
Non-accrual TDR Loans	371,000		476,000
Total TDR loans	371,000		476,000
Unfunded commitments to loans classified as TDRs	0		0
Auto finance
Loan Modifications for Borrowers with Financial Difficulties
Accruing TDR Loans	3,549,000		3,464,000
Non-accrual TDR Loans	5,296,000		5,351,000
Total TDR loans	8,845,000		8,815,000
Unfunded commitments to loans classified as TDRs	0		0
Other
Loan Modifications for Borrowers with Financial Difficulties
Accruing TDR Loans	3,000		3,000
Non-accrual TDR Loans	1,000		1,000
Total TDR loans	4,000		4,000
Consumer real estate and commercial
Loan Modifications for Borrowers with Financial Difficulties
Unfunded commitments to loans classified as TDRs	$ 2,300,000		$ 900,000

Modified TDR Loan Balances that

Modified TDR Loan Balances that Defaulted During the Period (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Loan Modifications for Borrowers with Financial Difficulties
Minimum period for loans to be delinquent to be considered in default	90 days	90 days
Defaulted TDR loan balance modified during the period	$ 6,569	$ 11,223
Consumer real estate
Loan Modifications for Borrowers with Financial Difficulties
Defaulted TDR loan balance modified during the period	1,508	480
Consumer real estate | First mortgage lien
Loan Modifications for Borrowers with Financial Difficulties
Defaulted TDR loan balance modified during the period	1,480	368
Consumer real estate | Junior lien
Loan Modifications for Borrowers with Financial Difficulties
Defaulted TDR loan balance modified during the period	28	112
Commercial
Loan Modifications for Borrowers with Financial Difficulties
Defaulted TDR loan balance modified during the period	4,697	10,034
Commercial | Commercial real estate
Loan Modifications for Borrowers with Financial Difficulties
Defaulted TDR loan balance modified during the period	0	6,681
Commercial | Commercial business
Loan Modifications for Borrowers with Financial Difficulties
Defaulted TDR loan balance modified during the period	4,697	3,353
Leasing and equipment finance
Loan Modifications for Borrowers with Financial Difficulties
Defaulted TDR loan balance modified during the period	0	407
Auto Finance
Loan Modifications for Borrowers with Financial Difficulties
Defaulted TDR loan balance modified during the period	$ 364	$ 302

Impaired Loans (Details)

Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Impaired Loans
Unpaid Contractual Balance with an Allowance Recorded	$ 154,553		$ 158,339
Unpaid Contractual Balance without an Allowance Recorded	45,237		48,854
Total Unpaid Contractual Balance	199,790		207,193
Loan Balance with an Allowance Recorded	141,180		144,312
Loan Balance without an Allowance Recorded	26,927		27,136
Total Loan Balance	168,107		171,448
Related Allowance Recorded	21,364		21,394
Average Loan Balance with an Allowance Recorded	142,746	$ 168,836
Average Loan Balance without an Allowance Recorded	27,032	35,818
Total Average Loan Balance	169,778	204,654
Interest Income Recognized with an Allowance Recorded	1,074	1,336
Interest Income Recognized without an Allowance Recorded	422	788
Total Interest Income Recognized	1,496	2,124
Consumer real estate
Impaired Loans
Unpaid Contractual Balance with an Allowance Recorded	121,828		123,951
Unpaid Contractual Balance without an Allowance Recorded	26,621		30,595
Loan Balance with an Allowance Recorded	108,887		110,346
Loan Balance without an Allowance Recorded	11,958		12,028
Related Allowance Recorded	17,577		17,957
Average Loan Balance with an Allowance Recorded	109,617	140,806
Average Loan Balance without an Allowance Recorded	11,993	14,225
Interest Income Recognized with an Allowance Recorded	959	1,171
Interest Income Recognized without an Allowance Recorded	238	570
Consumer real estate | First mortgage lien
Impaired Loans
Unpaid Contractual Balance with an Allowance Recorded	90,065		91,624
Unpaid Contractual Balance without an Allowance Recorded	12,844		12,898
Loan Balance with an Allowance Recorded	79,687		80,802
Loan Balance without an Allowance Recorded	10,397		10,445
Related Allowance Recorded	13,491		13,792
Average Loan Balance with an Allowance Recorded	80,245	96,979
Average Loan Balance without an Allowance Recorded	10,421	12,342
Interest Income Recognized with an Allowance Recorded	654	725
Interest Income Recognized without an Allowance Recorded	183	318
Consumer real estate | Junior lien
Impaired Loans
Unpaid Contractual Balance with an Allowance Recorded	31,763		32,327
Unpaid Contractual Balance without an Allowance Recorded	13,777		17,697
Loan Balance with an Allowance Recorded	29,200		29,544
Loan Balance without an Allowance Recorded	1,561		1,583
Related Allowance Recorded	4,086		4,165
Average Loan Balance with an Allowance Recorded	29,372	43,827
Average Loan Balance without an Allowance Recorded	1,572	1,883
Interest Income Recognized with an Allowance Recorded	305	446
Interest Income Recognized without an Allowance Recorded	55	252
Commercial
Impaired Loans
Unpaid Contractual Balance with an Allowance Recorded	14,028		14,651
Unpaid Contractual Balance without an Allowance Recorded	4,483		4,552
Loan Balance with an Allowance Recorded	13,823		14,543
Loan Balance without an Allowance Recorded	4,421		4,491
Related Allowance Recorded	1,563		1,560
Average Loan Balance with an Allowance Recorded	14,183	7,785
Average Loan Balance without an Allowance Recorded	4,457	18,365
Interest Income Recognized with an Allowance Recorded	86	64
Interest Income Recognized without an Allowance Recorded	58	174
Commercial | Commercial real estate
Impaired Loans
Unpaid Contractual Balance with an Allowance Recorded	6,766		6,810
Unpaid Contractual Balance without an Allowance Recorded	4,483		4,552
Loan Balance with an Allowance Recorded	6,559		6,702
Loan Balance without an Allowance Recorded	4,421		4,491
Related Allowance Recorded	1,000		1,000
Average Loan Balance with an Allowance Recorded	6,631	6,733
Average Loan Balance without an Allowance Recorded	4,457	17,936
Interest Income Recognized with an Allowance Recorded	0	16
Interest Income Recognized without an Allowance Recorded	58	174
Commercial | Commercial business
Impaired Loans
Unpaid Contractual Balance with an Allowance Recorded	7,262		7,841
Unpaid Contractual Balance without an Allowance Recorded	0		0
Loan Balance with an Allowance Recorded	7,264		7,841
Loan Balance without an Allowance Recorded	0		0
Related Allowance Recorded	563		560
Average Loan Balance with an Allowance Recorded	7,552	1,052
Average Loan Balance without an Allowance Recorded	0	429
Interest Income Recognized with an Allowance Recorded	86	48
Interest Income Recognized without an Allowance Recorded	0	0
Leasing and equipment finance
Impaired Loans
Unpaid Contractual Balance with an Allowance Recorded	16,548		17,105
Loan Balance with an Allowance Recorded	16,548		17,105
Related Allowance Recorded	1,897		1,345
Average Loan Balance with an Allowance Recorded	16,826	10,620
Interest Income Recognized with an Allowance Recorded	6	3
Inventory finance
Impaired Loans
Unpaid Contractual Balance with an Allowance Recorded	1,185		1,296
Unpaid Contractual Balance without an Allowance Recorded	2,426		2,810
Loan Balance with an Allowance Recorded	1,189		1,298
Loan Balance without an Allowance Recorded	2,432		2,818
Related Allowance Recorded	188		288
Average Loan Balance with an Allowance Recorded	1,243	4,510
Average Loan Balance without an Allowance Recorded	2,625	638
Interest Income Recognized with an Allowance Recorded	23	52
Interest Income Recognized without an Allowance Recorded	57	44
Auto finance
Impaired Loans
Unpaid Contractual Balance with an Allowance Recorded	961		1,333
Unpaid Contractual Balance without an Allowance Recorded	11,376		10,566
Loan Balance with an Allowance Recorded	729		1,016
Loan Balance without an Allowance Recorded	8,116		7,799
Related Allowance Recorded	138		243
Average Loan Balance with an Allowance Recorded	873	5,109
Average Loan Balance without an Allowance Recorded	7,957	2,590
Interest Income Recognized with an Allowance Recorded	0	46
Interest Income Recognized without an Allowance Recorded	69	0
Other
Impaired Loans
Unpaid Contractual Balance with an Allowance Recorded	3		3
Unpaid Contractual Balance without an Allowance Recorded	331		331
Loan Balance with an Allowance Recorded	4		4
Loan Balance without an Allowance Recorded	0		0
Related Allowance Recorded	1		$ 1
Average Loan Balance with an Allowance Recorded	4	6
Interest Income Recognized with an Allowance Recorded	$ 0	$ 0

Other Real Estate Owned and Rep

Other Real Estate Owned and Repossessed and Returned Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Other Real Estate Owned and Repossessed and Returned Assets
Other real estate owned	$ 17,179		$ 18,225
Repossessed and returned assets	13,248		12,630
Consumer real estate loans in process of foreclosure	21,449		$ 22,622
Other real estate owned and repossessed and returned assets
Other Real Estate Owned and Repossessed and Returned Assets
Amount written down, included in foreclosed real estate and repossessed assets, net expense	$ 1,200	$ 1,700

Long-term Borrowings (Details)

Long-term Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt instrument
Long-term borrowings	$ 1,457,976	$ 1,249,449
Federal Home Loan Bank advances
Debt instrument
FHLB advances, amount prepayable	1,100,000
Federal Home Loan Bank advances
Debt instrument
Long-term borrowings	1,100,000	875,000
Federal Home Loan Bank advances | TCF Bank
Debt instrument
Loans pledged as collateral	4,300,000
Federal Home Loan Bank advances | Maturity Year 2019
Debt instrument
Long-term borrowings	$ 0	$ 600,000
Stated Rate	0.00%
Federal Home Loan Bank advances | Maturity Year 2019 | Minimum
Debt instrument
Stated Rate		1.40%
Federal Home Loan Bank advances | Maturity Year 2019 | Maximum
Debt instrument
Stated Rate		1.75%
Federal Home Loan Bank advances | Maturity Year 2020
Debt instrument
Long-term borrowings	$ 1,100,000	$ 275,000
Federal Home Loan Bank advances | Maturity Year 2020 | Minimum
Debt instrument
Stated Rate	1.86%	1.76%
Federal Home Loan Bank advances | Maturity Year 2020 | Maximum
Debt instrument
Stated Rate	2.25%	1.78%
Subordinated bank notes
Debt instrument
Long-term borrowings	$ 251,419	$ 254,962
Subordinated bank notes | Maturity Year 2022
Debt instrument
Long-term borrowings	$ 108,923	$ 108,867
Stated Rate	6.25%	6.25%
Subordinated bank notes | Maturity Year 2025
Debt instrument
Long-term borrowings	$ 148,304	$ 148,252
Stated Rate	4.60%	4.60%
Subordinated bank notes | Maturity Year 2025, Interest Rate Swap
Debt instrument
Long-term borrowings	$ (5,808)	$ (2,157)
Discounted lease rentals
Debt instrument
Long-term borrowings	106,557	119,487
Discounted lease rentals | Maturity Year 2018
Debt instrument
Long-term borrowings	$ 36,140	$ 52,347
Discounted lease rentals | Maturity Year 2018 | Minimum
Debt instrument
Stated Rate	2.73%	2.55%
Discounted lease rentals | Maturity Year 2018 | Maximum
Debt instrument
Stated Rate	7.95%	7.95%
Discounted lease rentals | Maturity Year 2019
Debt instrument
Long-term borrowings	$ 36,042	$ 34,978
Discounted lease rentals | Maturity Year 2019 | Minimum
Debt instrument
Stated Rate	2.53%	2.53%
Discounted lease rentals | Maturity Year 2019 | Maximum
Debt instrument
Stated Rate	6.00%	6.00%
Discounted lease rentals | Maturity Year 2020
Debt instrument
Long-term borrowings	$ 20,843	$ 19,736
Discounted lease rentals | Maturity Year 2020 | Minimum
Debt instrument
Stated Rate	2.64%	2.64%
Discounted lease rentals | Maturity Year 2020 | Maximum
Debt instrument
Stated Rate	6.50%	6.50%
Discounted lease rentals | Maturity Year 2021
Debt instrument
Long-term borrowings	$ 10,700	$ 10,077
Discounted lease rentals | Maturity Year 2021 | Minimum
Debt instrument
Stated Rate	2.88%	2.88%
Discounted lease rentals | Maturity Year 2021 | Maximum
Debt instrument
Stated Rate	5.49%	5.00%
Discounted lease rentals | Maturity Year 2022
Debt instrument
Long-term borrowings	$ 2,829	$ 2,349
Discounted lease rentals | Maturity Year 2022 | Minimum
Debt instrument
Stated Rate	3.04%	3.04%
Discounted lease rentals | Maturity Year 2022 | Maximum
Debt instrument
Stated Rate	5.43%	5.43%
Discounted lease rentals | Maturity Year 2023
Debt instrument
Long-term borrowings	$ 3	$ 0
Stated Rate		0.00%
Discounted lease rentals | Maturity Year 2023 | Minimum
Debt instrument
Stated Rate	5.40%
Discounted lease rentals | Maturity Year 2023 | Maximum
Debt instrument
Stated Rate	5.40%

Preferred Stock (Details)

Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Preferred Stock
Preferred stock, value outstanding		$ 169,302		$ 265,821
Preferred stock, par value (in dollars per share)		$ 0.01		$ 0.01
Cash dividends paid on preferred stock		$ 4,106	$ 4,847
Redemption of Series B Preferred Stock		100,000
Deferred stock issuance costs of Series B Preferred Stock		3,500
Series B Preferred Stock
Schedule of Preferred Stock
Preferred stock, value outstanding		0		$ 96,519
Annual rate of dividend (as a percent)	6.45%
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock, liquidation preference per share	$ 25
Cash dividends paid on preferred stock		1,600	$ 1,600
Redemption of Series B Preferred Stock (in shares)	4,000,000
Redemption of Series B Preferred Stock	$ 100,000
Series C Preferred Stock
Schedule of Preferred Stock
Preferred stock, value outstanding		$ 169,302		$ 169,302
Preferred stock, depositary shares outstanding		7,000,000		7,000,000
Annual rate of dividend (as a percent)		5.70%		5.70%
Preferred stock, par value (in dollars per share)		$ 0.01		$ 0.01
Preferred stock, liquidation preference per share		25,000		25,000
Preferred stock, liquidation preference per depositary share		$ 25		$ 25
Cash dividends paid on preferred stock		$ 2,500

Treasury Stock and Other (Detai

Treasury Stock and Other (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Treasury Stock and Other
Treasury stock, at cost	$ 67,938		$ 10,265
Shares held in trust for deferred compensation plans, at cost	29,862		30,532
Total	$ 97,800		$ 40,797
Repurchase of common stock (in shares)	2,567,171	0
Average cost per share of treasury stock repurchased (in dollars per share)	$ 22.45
Aggregate value of shares remaining in the stock repurchase program	$ 83,200

Regulatory Capital Requiremen63

Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations
Number of prior calendar years considered for payment of dividends in excess of net retained profit	2 years
Net profits for the current year combined with retained net profits for preceding two calendar years	$ 253,700
Maximum
Compliance with Regulatory Capital Requirements under Banking Regulations
Percentage of net retained profits for the current year combined with retained net profits for the preceding two calendar years that can be declared as dividend	100.00%
TCF
Regulatory Capital:
Common equity Tier 1 capital	$ 2,222,390	$ 2,242,410
Tier 1 capital	2,414,838	2,522,178
Total capital	$ 2,786,637	$ 2,889,323
Common equity Tier 1 capital ratio
Actual, Ratio	10.57%	10.79%
Tier 1 risk-based capital ratio
Actual, Ratio	11.49%	12.14%
Total risk-based capital ratio
Actual, Ratio	13.26%	13.90%
Tier 1 leverage ratio
Actual, Ratio	10.52%	11.12%
TCF Bank
Compliance with Regulatory Capital Requirements under Banking Regulations
Capital conservation buffer excluded from minimum capital requirement	1.875%	1.25%
Regulatory Capital:
Common equity Tier 1 capital	$ 2,300,115	$ 2,409,027
Tier 1 capital	2,328,552	2,426,854
Total capital	$ 2,736,257	$ 2,837,374
Common equity Tier 1 capital ratio
Actual, Ratio	10.94%	11.59%
Well-Capitalized Capital Requirement, Ratio	6.50%
Minimum Capital Requirement, Ratio	4.50%
Tier 1 risk-based capital ratio
Actual, Ratio	11.08%	11.68%
Well-Capitalized Capital Requirement, Ratio	8.00%
Minimum Capital Requirement, Ratio	6.00%
Total risk-based capital ratio
Actual, Ratio	13.02%	13.65%
Well-Capitalized Capital Requirement, Ratio	10.00%
Minimum Capital Requirement, Ratio	8.00%
Tier 1 leverage ratio
Actual, Ratio	10.14%	10.70%
Well-Capitalized Capital Requirement, Ratio	5.00%
Minimum Capital Requirement, Ratio	4.00%

Restricted Stock Award and Stoc

Restricted Stock Award and Stock Option Transactions (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Restricted Stock Awards (RSAs)
Restricted Stock Awards, Shares Activity
Outstanding at the beginning of the period (in shares)	2,639,663
Granted (in shares)	450,795
Forfeited/cancelled (in shares)	(93,820)
Vested (in shares)	(477,179)
Outstanding at the end of the period (in shares)	2,519,459	2,639,663
Restricted Stock Awards, Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Outstanding at the beginning (in dollars per share)	$ 13.65
Weighted-Average Grant Date Fair Value, Granted (in dollars per share)	22.19
Weighted-Average Grant Date Fair Value, Forfeited/cancelled (in dollars per share)	14.78
Weighted-Average Grant Date Fair Value, Vested (in dollars per share)	10.73
Weighted-Average Grant Date Fair Value, Outstanding at the end (in dollars per share)	$ 15.69	$ 13.65
Stock Options
Stock options, shares activity
Outstanding at the beginning of the period (in shares)	366,000
Granted (in shares)	0
Exercised (in shares)	(366,000)
Forfeited/canceled (in shares)	0
Vested (in shares)	0
Outstanding at the end of the period (in shares)	0	366,000
Stock Options, Weighted-Average Remaining Contractual Life
Weighted- Average Remaining Contractual Life	0 days	22 days
Weighted-Average Exercise Price
Weighted-Average Exercise Price, Outstanding at the beginning (in dollars per share)	$ 15.75
Weighted-Average Exercise Price, Granted (in dollars per share)	0
Weighted-Average Exercise Price, Exercised (in dollars per share)	15.75
Weighted-Average Exercise Price, Forfeited/canceled (in dollars per share)	0
Weighted-Average Exercise Price, Vested (in dollars per share)	0
Weighted-Average Exercise Price, Outstanding at the end (in dollars per share)	$ 0	$ 15.75
Stock options outstanding and exercisable
Stock Options Exercisable (in shares)	0
Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 0

Stock Compensation Information

Stock Compensation Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restricted Stock Awards (RSAs)
Share-based compensation
Outstanding number of shares to vest only if certain performance goals and service conditions are achieved (in shares)	264,373
Unrecognized stock compensation expense for restricted stock awards	$ 22
Weighted-average remaining amortization period	1 year 6 months
Restricted Stock Awards and Restricted Stock Units
Share-based compensation
Compensation expense	$ 5.9	$ 1.9
Omnibus Incentive Plan | Restricted Stock Units (RSUs)
Share-based compensation
Restricted stock units, granted (in shares)	411,825
Restricted stock, maximum multiplier	150.00%
Remaining weighted-average performance period for RSUs	2 years 1 month 21 days

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Plan
Net periodic benefit plan (income) cost included in non-interest expense
Interest cost	$ 246,000	$ 285,000
Return on plan assets	(132,000)	(142,000)
Net periodic benefit plan (income) cost	114,000	143,000
TCF contributions	0	0
Postretirement Plan
Net periodic benefit plan (income) cost included in non-interest expense
Interest cost	28,000	34,000
Amortization of prior service cost	(12,000)	(12,000)
Net periodic benefit plan (income) cost	16,000	22,000
TCF contributions	$ 100,000	$ 100,000

Derivative Instruments (Details

Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative Assets:
Gross Amounts Recognized	$ 1,791	$ 2,020
Gross Amounts Offset	(705)	(457)
Net Amount Presented	1,086	1,563
Derivative Liabilities:
Gross Amounts Recognized	7,842	8,666
Gross Amounts Offset	(3,097)	(7,098)
Net Amount Presented	4,745	1,568
Derivatives designated as hedging instruments
Derivative Assets:
Gross Amounts Recognized	311	405
Gross Amounts Offset	(311)	(405)
Net Amount Presented	0	0
Derivative Liabilities:
Gross Amounts Recognized	291	1,744
Gross Amounts Offset	(94)	(1,744)
Net Amount Presented	197	0
Derivatives designated as hedging instruments | Interest rate contracts
Derivative Assets:
Notional Amount	150,000	150,000
Gross Amounts Recognized	311	405
Gross Amounts Offset	(311)	(405)
Net Amount Presented	0	0
Derivatives designated as hedging instruments | Forward foreign exchange contracts
Derivative Liabilities:
Notional Amount	78,248	77,879
Gross Amounts Recognized	291	1,744
Gross Amounts Offset	(94)	(1,744)
Net Amount Presented	197	0
Derivatives not designated as hedging instruments
Derivative Assets:
Gross Amounts Recognized	1,480	1,615
Gross Amounts Offset	(394)	(52)
Net Amount Presented	1,086	1,563
Derivative Liabilities:
Gross Amounts Recognized	7,551	6,922
Gross Amounts Offset	(3,003)	(5,354)
Net Amount Presented	4,548	1,568
Derivatives not designated as hedging instruments | Interest rate contracts
Derivative Assets:
Notional Amount	101,172	169,377
Gross Amounts Recognized	704	1,392
Gross Amounts Offset	(176)	(52)
Net Amount Presented	528	1,340
Derivative Liabilities:
Notional Amount	576,844	423,006
Gross Amounts Recognized	4,799	1,688
Gross Amounts Offset	(388)	(457)
Net Amount Presented	4,411	1,231
Derivatives not designated as hedging instruments | Forward foreign exchange contracts
Derivative Assets:
Notional Amount	85,305
Gross Amounts Recognized	218
Gross Amounts Offset	(218)
Net Amount Presented	0
Derivative Liabilities:
Notional Amount	241,103	330,928
Gross Amounts Recognized	2,214	4,619
Gross Amounts Offset	(2,077)	(4,282)
Net Amount Presented	137	337
Derivatives not designated as hedging instruments | Interest rate lock commitments
Derivative Assets:
Notional Amount	37,820	17,974
Gross Amounts Recognized	558	223
Gross Amounts Offset	0	0
Net Amount Presented	558	223
Derivative Liabilities:
Notional Amount		41
Gross Amounts Recognized		0
Gross Amounts Offset		0
Net Amount Presented		0
Derivatives not designated as hedging instruments | Other contracts
Derivative Liabilities:
Notional Amount	13,804	13,804
Gross Amounts Recognized	538	615
Gross Amounts Offset	(538)	(615)
Net Amount Presented	$ 0	$ 0

Derivatives Designated as Hedgi

Derivatives Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Interest Rate Contract
Fixed-rate subordinated notes, face amount	$ 150,000
Carrying amount of the hedged liability - Long-term borrowings	142,496		$ 146,095
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged liability - Long-term borrowings	(5,808)		$ (2,157)
Gains and losses related to changes in the fair vale of the interest rate swap and hedged debt
Total amount presented in the Consolidated Statements of Income - Interest expense - borrowings	9,553	$ 6,478
Total amount presented in the Consolidated Statements of Income - Other non-interest income	3,716	2,703
Interest expense - borrowings
Gains and losses related to changes in the fair vale of the interest rate swap and hedged debt
Effect of fair value hedge: Hedged item	3,806
Effect of fair value hedge: Derivative designated as a hedging instrument	(3,858)
Other non-interest Income
Gains and losses related to changes in the fair vale of the interest rate swap and hedged debt
Effect of fair value hedge: Hedged item		513
Effect of fair value hedge: Derivative designated as a hedging instrument		(501)
Net investment hedge | Derivatives designated as hedges | Forward foreign exchange contracts
Forward Foreign Exchange Contracts
Effect of net investment hedges on accumulated other comprehensive income	$ 2,137	$ (504)

Derivatives Not Designated as H

Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Forward foreign exchange contracts
Credit risk-related contingent features
Forward foreign exchange contracts with credit risk-related contingent features, notional value	$ 93,100		$ 39,800
Additional collateral required, if TCF was rated less than BB- by Standard and Poor's	1,900		800
Forward foreign exchange contracts with credit risk-related contingent features, net liability amount	700		$ 400
Derivative, Collateral
Cash collateral posted	2,000
Interest rate contracts
Derivative, Collateral
Cash collateral posted	7,400
Other contracts
Derivative, Collateral
Cash collateral posted	1,400
Derivatives not designated as hedges
Derivative instruments, gain (loss)
Effect of derivatives included in the Consolidated Statements of Income	9,667	$ (3,101)
Derivatives not designated as hedges | Forward foreign exchange contracts | Other non-interest expense
Derivative instruments, gain (loss)
Effect of derivatives included in the Consolidated Statements of Income	8,944	(3,259)
Derivatives not designated as hedges | Interest rate lock commitments | Gains on sales of consumer real estate loans, net
Derivative instruments, gain (loss)
Effect of derivatives included in the Consolidated Statements of Income	624	167
Derivatives not designated as hedges | Interest rate contracts | Other non-interest income
Derivative instruments, gain (loss)
Effect of derivatives included in the Consolidated Statements of Income	$ 99	$ (9)

Valuation Methodologies of Asse

Valuation Methodologies of Assets and Liabilities at Fair Value (Details) $ in Millions	Mar. 31, 2018USD ($)
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Fixed-rate subordinated notes, face amount	$ 150
Subordinated bank notes | Maturity Year 2025
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Fixed-rate subordinated notes, face amount	$ 150

Assets and Liabilities Measured

Assets and Liabilities Measured at Fair Value (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value, Adjustment Disclosure [Abstract]
Transfers between fair value levels	$ 0	$ 0
Measurement of fair value on a recurring basis
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	40,983,000		$ 35,406,000
Liabilities, Fair value carrying amount	37,541,000		36,889,000
Measurement of fair value on a recurring basis | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	29,952,000		29,962,000
Liabilities, Fair value carrying amount	29,952,000		29,962,000
Measurement of fair value on a recurring basis | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	1,233,000		1,797,000
Liabilities, Fair value carrying amount	7,013,000		6,307,000
Measurement of fair value on a recurring basis | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	9,798,000		3,647,000
Liabilities, Fair value carrying amount	576,000		620,000
Measurement of fair value on a recurring basis | Loans held for sale
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	9,058,000		3,356,000
Measurement of fair value on a recurring basis | Loans held for sale | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Loans held for sale | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Loans held for sale | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	9,058,000		3,356,000
Measurement of fair value on a recurring basis | Forward foreign exchange contracts
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	218,000
Liabilities, Fair value carrying amount	2,214,000		4,619,000
Measurement of fair value on a recurring basis | Forward foreign exchange contracts | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0
Liabilities, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Forward foreign exchange contracts | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	218,000
Liabilities, Fair value carrying amount	2,214,000		4,619,000
Measurement of fair value on a recurring basis | Forward foreign exchange contracts | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0
Liabilities, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Interest rate contracts
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	1,015,000		1,797,000
Liabilities, Fair value carrying amount	4,799,000		1,688,000
Measurement of fair value on a recurring basis | Interest rate contracts | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Liabilities, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Interest rate contracts | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	1,015,000		1,797,000
Liabilities, Fair value carrying amount	4,799,000		1,688,000
Measurement of fair value on a recurring basis | Interest rate contracts | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Liabilities, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Interest rate lock commitments
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	558,000		223,000
Measurement of fair value on a recurring basis | Interest rate lock commitments | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Interest rate lock commitments | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Interest rate lock commitments | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	558,000		223,000
Measurement of fair value on a recurring basis | Forward loan sales commitments
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	182,000		68,000
Liabilities, Fair value carrying amount	38,000		5,000
Measurement of fair value on a recurring basis | Forward loan sales commitments | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Liabilities, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Forward loan sales commitments | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Liabilities, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Forward loan sales commitments | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	182,000		68,000
Liabilities, Fair value carrying amount	38,000		5,000
Measurement of fair value on a recurring basis | Assets held in trust for deferred compensation plans
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	29,952,000		29,962,000
Measurement of fair value on a recurring basis | Assets held in trust for deferred compensation plans | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	29,952,000		29,962,000
Measurement of fair value on a recurring basis | Assets held in trust for deferred compensation plans | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Assets held in trust for deferred compensation plans | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Other contracts
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Liabilities, Fair value carrying amount	538,000		615,000
Measurement of fair value on a recurring basis | Other contracts | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Liabilities, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Other contracts | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Liabilities, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Other contracts | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Liabilities, Fair value carrying amount	538,000		615,000
Measurement of fair value on a recurring basis | Liabilities held in trust for deferred compensation plans
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Liabilities, Fair value carrying amount	29,952,000		29,962,000
Measurement of fair value on a recurring basis | Liabilities held in trust for deferred compensation plans | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Liabilities, Fair value carrying amount	29,952,000		29,962,000
Measurement of fair value on a recurring basis | Liabilities held in trust for deferred compensation plans | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Liabilities, Fair value carrying amount	0		0
Measurement of fair value on a recurring basis | Liabilities held in trust for deferred compensation plans | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Liabilities, Fair value carrying amount	0		0
Measurement of fair value on a non-recurring basis
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	97,595,000		94,380,000
Loans	76,424,000		72,287,000
Repossessed and returned assets	8,084,000		8,057,000
Measurement of fair value on a non-recurring basis | Consumer
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Other real estate owned	13,002,000		13,951,000
Measurement of fair value on a non-recurring basis | Commercial
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Other real estate owned	85,000		85,000
Measurement of fair value on a non-recurring basis | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Loans	0		0
Repossessed and returned assets	0		0
Measurement of fair value on a non-recurring basis | Level 1 | Consumer
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Other real estate owned	0		0
Measurement of fair value on a non-recurring basis | Level 1 | Commercial
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Other real estate owned	0		0
Measurement of fair value on a non-recurring basis | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	4,505,000		3,669,000
Loans	0		0
Repossessed and returned assets	4,505,000		3,669,000
Measurement of fair value on a non-recurring basis | Level 2 | Consumer
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Other real estate owned	0		0
Measurement of fair value on a non-recurring basis | Level 2 | Commercial
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Other real estate owned	0		0
Measurement of fair value on a non-recurring basis | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	93,090,000		90,711,000
Loans	76,424,000		72,287,000
Repossessed and returned assets	3,579,000		4,388,000
Measurement of fair value on a non-recurring basis | Level 3 | Consumer
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Other real estate owned	13,002,000		13,951,000
Measurement of fair value on a non-recurring basis | Level 3 | Commercial
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Other real estate owned	85,000		85,000
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	1,976,097,000		1,730,404,000
Liabilities, Fair value carrying amount	291,000		1,744,000
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Liabilities, Fair value carrying amount	0		0
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	1,954,241,000		1,709,012,000
Liabilities, Fair value carrying amount	291,000		1,744,000
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	21,856,000		21,392,000
Liabilities, Fair value carrying amount	0		0
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Forward foreign exchange contracts
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Liabilities, Fair value carrying amount	291,000		1,744,000
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Forward foreign exchange contracts | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Liabilities, Fair value carrying amount	0		0
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Forward foreign exchange contracts | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Liabilities, Fair value carrying amount	291,000		1,744,000
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Forward foreign exchange contracts | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Liabilities, Fair value carrying amount	0		0
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | U.S. Government sponsored enterprises and federal agencies
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	1,141,652,000		894,685,000
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | U.S. Government sponsored enterprises and federal agencies | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | U.S. Government sponsored enterprises and federal agencies | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	1,141,652,000		894,685,000
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | U.S. Government sponsored enterprises and federal agencies | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Mortgage-backed securities, Other
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	5,000		6,000
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Mortgage-backed securities, Other | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Mortgage-backed securities, Other | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Mortgage-backed securities, Other | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	5,000		6,000
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Obligations of states and political subdivisions
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	812,589,000		814,327,000
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Obligations of states and political subdivisions | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Obligations of states and political subdivisions | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	812,589,000		814,327,000
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Obligations of states and political subdivisions | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Interest-only strips
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	21,851,000		21,386,000
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Interest-only strips | Level 1
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Interest-only strips | Level 2
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	0		0
Other Comprehensive Income (Loss) | Measurement of fair value on a recurring basis | Interest-only strips | Level 3
Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis
Assets, Fair value carrying amount	$ 21,851,000		$ 21,386,000

Changes in Level 3 Assets and L

Changes in Level 3 Assets and Liabilities Measured at Fair Value (Details) - Level 3 - Measurement of fair value on a recurring basis - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest Rate Lock Commitments
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 223	$ 297
Total net gains (losses) included in net income	335	167
Total net gains (losses) include in other comprehensive income (loss)	0	0
Sales	0	0
Originations	0	0
Principal paydowns / settlements	0	0
Ending balance	558	464
Forward Loan Sales Commitments
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	63	361
Total net gains (losses) included in net income	81	(453)
Total net gains (losses) include in other comprehensive income (loss)	0	0
Sales	0	0
Originations	0	0
Principal paydowns / settlements	0	0
Ending balance	144	(92)
Other Contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	(615)	(619)
Total net gains (losses) included in net income	0	0
Total net gains (losses) include in other comprehensive income (loss)	0	0
Sales	0	0
Originations	0	0
Principal paydowns / settlements	77	78
Ending balance	(538)	(541)
Debt Securities Available for Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	6	18
Total net gains (losses) included in net income	0	0
Total net gains (losses) included in other comprehensive income (loss)	0	0
Sales	0	0
Originations	0	0
Principal paydowns / settlements	(1)	(4)
Ending balance	5	14
Loans Held for Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	3,356	6,498
Total net gains (losses) included in net income	97	104
Total net gains (losses) included in other comprehensive income (loss)	0	0
Sales	(59,747)	(46,714)
Originations	65,355	43,479
Principal paydowns / settlements	(3)	(5)
Ending balance	9,058	3,362
Interest-only Strips
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	21,386	40,152
Total net gains (losses) included in net income	331	1,113
Total net gains (losses) included in other comprehensive income (loss)	777	(328)
Sales	0	0
Originations	3,299	1,347
Principal paydowns / settlements	(3,942)	(6,501)
Ending balance	$ 21,851	$ 35,783

Fair Value Option (Details)

Fair Value Option (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures
Amount of loans recorded under the fair value option that were delinquent or on non-accrual status	$ 0		$ 0
Loans Held for Sale
Fair Value, Option, Quantitative Disclosures
Fair value carrying amount	9,058,000		3,356,000
Aggregate unpaid principal amount	8,911,000		3,268,000
Fair value carrying amount less aggregate unpaid principal	147,000		$ 88,000
Loans Held for Sale | Gains on sales of consumer real estate loans, net
Fair Value, Option, Quantitative Disclosures
Net gain from initial measurement of the correspondent lending loans held for sale and subsequent changes in fair value for loans outstanding	$ 1,600,000	$ 1,100,000

Estimated Fair Value of Financi

Estimated Fair Value of Financial Instrument Assets, Liabilities, and Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financial instrument assets:
Debt securities held to maturity	$ 158,099	$ 161,576
Loans:
Consumer real estate	4,721,662	4,819,696
Inventory finance	3,457,855	2,739,754
Auto finance	2,839,363	3,199,639
Other	19,854	22,517
Allowance for loan losses	(167,703)	(171,041)	$ (160,166)	$ (160,269)
Carrying Amount
Financial instrument assets:
Investments	91,661	82,644
Debt securities held to maturity	158,099	161,576
Loans held for sale	50,075	134,752
Loans:
Consumer real estate	4,721,662	4,819,696
Commercial real estate	2,809,452	2,751,285
Commercial business	868,729	809,908
Equipment finance	2,220,591	2,300,479
Inventory finance	3,457,855	2,739,754
Auto finance	2,839,363	3,199,639
Other	19,854	22,517
Allowance for loan losses	(167,703)	(171,041)
Securitization receivable	19,242	19,179
Total financial instrument assets	17,088,880	16,870,388
Financial instrument liabilities:
Deposits	18,697,672	18,335,002
Long-term borrowings	1,457,976	1,249,449
Total financial instrument liabilities	20,155,648	19,584,451
Financial instruments with off-balance sheet risk:
Commitments to extend credit	19,081	19,423
Standby letters of credit	(64)	(83)
Total financial instruments with off-balance sheet risk	19,017	19,340
Estimated Fair Value
Financial instrument assets:
Investments	91,661	82,644
Debt securities held to maturity	158,496	165,626
Loans held for sale	51,654	139,458
Loans:
Consumer real estate	4,791,418	4,916,475
Commercial real estate	2,757,467	2,710,237
Commercial business	843,412	776,989
Equipment finance	2,174,558	2,260,692
Inventory finance	3,441,004	2,723,045
Auto finance	2,813,761	3,197,794
Other	18,517	21,129
Allowance for loan losses	0	0
Securitization receivable	18,702	18,595
Total financial instrument assets	17,160,650	17,012,684
Financial instrument liabilities:
Deposits	18,733,779	18,376,257
Long-term borrowings	1,461,557	1,255,333
Total financial instrument liabilities	20,195,336	19,631,590
Financial instruments with off-balance sheet risk:
Commitments to extend credit	19,081	19,423
Standby letters of credit	(64)	(83)
Total financial instruments with off-balance sheet risk	19,017	19,340
Estimated Fair Value | Level 1
Financial instrument assets:
Investments	0	0
Debt securities held to maturity	0	0
Loans held for sale	0	0
Loans:
Consumer real estate	0	0
Commercial real estate	0	0
Commercial business	0	0
Equipment finance	0	0
Inventory finance	0	0
Auto finance	0	0
Other	0	0
Allowance for loan losses	0	0
Securitization receivable	0	0
Total financial instrument assets	0	0
Financial instrument liabilities:
Deposits	13,702,036	13,352,731
Long-term borrowings	0	0
Total financial instrument liabilities	13,702,036	13,352,731
Financial instruments with off-balance sheet risk:
Commitments to extend credit	0	0
Standby letters of credit	0	0
Total financial instruments with off-balance sheet risk	0	0
Estimated Fair Value | Level 2
Financial instrument assets:
Investments	91,661	82,644
Debt securities held to maturity	155,696	162,826
Loans held for sale	0	0
Loans:
Consumer real estate	0	0
Commercial real estate	0	0
Commercial business	0	0
Equipment finance	0	0
Inventory finance	0	0
Auto finance	0	0
Other	0	0
Allowance for loan losses	0	0
Securitization receivable	0	0
Total financial instrument assets	247,357	245,470
Financial instrument liabilities:
Deposits	5,031,743	5,023,526
Long-term borrowings	1,461,557	1,255,333
Total financial instrument liabilities	6,493,300	6,278,859
Financial instruments with off-balance sheet risk:
Commitments to extend credit	19,081	19,423
Standby letters of credit	(64)	(83)
Total financial instruments with off-balance sheet risk	19,017	19,340
Estimated Fair Value | Level 3
Financial instrument assets:
Investments	0	0
Debt securities held to maturity	2,800	2,800
Loans held for sale	51,654	139,458
Loans:
Consumer real estate	4,791,418	4,916,475
Commercial real estate	2,757,467	2,710,237
Commercial business	843,412	776,989
Equipment finance	2,174,558	2,260,692
Inventory finance	3,441,004	2,723,045
Auto finance	2,813,761	3,197,794
Other	18,517	21,129
Allowance for loan losses	0	0
Securitization receivable	18,702	18,595
Total financial instrument assets	16,913,293	16,767,214
Financial instrument liabilities:
Deposits	0	0
Long-term borrowings	0	0
Total financial instrument liabilities	0	0
Financial instruments with off-balance sheet risk:
Commitments to extend credit	0	0
Standby letters of credit	0	0
Total financial instruments with off-balance sheet risk	$ 0	$ 0

Computation of basic and dilute

Computation of basic and diluted earnings per common share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic Earnings Per Common Share:
Net income attributable to TCF Financial Corporation	$ 73,761	$ 46,278
Preferred stock dividends	4,106	4,847
Impact of preferred stock redemption	3,481	0
Net income available to common stockholders	66,174	41,431
Earnings allocated to participating securities	9	8
Earnings allocated to common stock	$ 66,165	$ 41,423
Weighted-average common shares outstanding for basic earnings per common share (in shares)	168,507,448	167,902,615
Basic earnings per common share (in dollars per share)	$ 0.39	$ 0.25
Diluted Earnings Per Common Share:
Earnings allocated to common stock	$ 66,165	$ 41,423
Weighted-average common shares outstanding used in basic earnings per common share calculation (in shares)	168,507,448	167,902,615
Net dilutive effect of:
Non-participating restricted stock (in shares)	721,353	436,442
Stock options (in shares)	8,278	41,626
Warrants (in shares)	760,067	149,051
Weighted-average common shares outstanding for diluted earnings per common share (in shares)	169,997,146	168,529,734
Diluted earnings per common share (in dollars per share)	$ 0.39	$ 0.25

Antidilutive securities exclude

Antidilutive securities excluded from computation of earnings per common share (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	0.6	0.5

Other Non-interest Expense (Det

Other Non-interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Advertising and marketing	$ 7,297	$ 6,406
Professional fees	5,321	7,193
Outside processing	5,236	4,481
Card processing and issuance costs	4,457	4,109
FDIC insurance	4,070	3,959
Loan and lease processing	3,587	6,181
Severance Costs	2,091	6,633
Other	26,760	25,254
Total other non-interest expense	$ 58,819	$ 64,216

Business Segments (Details)

Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Interest income:
Loans and leases	$ 260,375	$ 219,548
Debt securities available for sale	10,123	7,980
Debt securities held to maturity	1,019	1,280
Loans held for sale and other	3,745	13,499
Funds transfer pricing - credits	0	0
Total interest income	275,262	242,307
Interest expense:
Deposits	22,510	13,715
Borrowings	9,553	6,478
Funds transfer pricing - charges	0	0
Total interest expense	32,063	20,193
Net interest income	243,199	222,114
Provision for credit losses	11,368	12,193
Net interest income after provision for credit losses	231,831	209,921
Non-interest income:
Fees and service charges	30,751	31,282
Card revenue	13,759	13,150
ATM revenue	4,650	4,675
Subtotal	49,160	49,107
Gains on sales of auto loans, net	0	2,864
Gains on sales of consumer real estate loans, net	9,123	8,891
Servicing fee income	8,295	11,651
Subtotal	17,418	23,406
Leasing and equipment finance	41,847	28,298
Other	3,716	2,703
Fees and other revenue	112,141	103,514
Gains (losses) on debt securities, net	63	0
Total non-interest income	112,204	103,514
Non-interest expense:
Compensation and employee benefits	123,840	124,298
Occupancy and equipment	40,514	39,600
Other	58,819	64,216
Subtotal	223,173	228,114
Operating lease depreciation	17,274	11,242
Foreclosed real estate and repossessed assets, net	4,916	4,549
Other credit costs, net	617	101
Total non-interest expense	245,980	244,006
Income before income tax expense	98,055	69,429
Income tax expense (benefit)	21,631	20,843
Income after income tax expense	76,424	48,586
Income attributable to non-controlling interest	2,663	2,308
Preferred stock dividends	4,106	4,847
Impact of preferred stock redemption	3,481	0
Net income available to common stockholders	66,174	41,431
Total assets	23,385,052	21,836,568	$ 23,002,159
Revenues from external customers:
Interest Income	275,262	242,307
Non-interest income	112,204	103,514
Total	387,466	345,821
Consumer Banking
Interest income:
Loans and leases	109,760	97,233
Debt securities available for sale	0	0
Debt securities held to maturity	0	0
Loans held for sale and other	2,057	12,600
Funds transfer pricing - credits	96,582	87,882
Total interest income	208,399	197,715
Interest expense:
Deposits	17,855	12,042
Borrowings	12,407	11,083
Funds transfer pricing - charges	38,229	34,273
Total interest expense	68,491	57,398
Net interest income	139,908	140,317
Provision for credit losses	8,889	5,351
Net interest income after provision for credit losses	131,019	134,966
Non-interest income:
Fees and service charges	28,597	29,509
Card revenue	13,750	13,150
ATM revenue	4,649	4,675
Subtotal	46,996	47,334
Gains on sales of auto loans, net		2,864
Gains on sales of consumer real estate loans, net	9,123	8,891
Servicing fee income	7,926	11,313
Subtotal	17,049	23,068
Leasing and equipment finance	0	0
Other	3,065	2,360
Fees and other revenue	67,110	72,762
Gains (losses) on debt securities, net	0
Total non-interest income	67,110	72,762
Non-interest expense:
Compensation and employee benefits	55,230	61,220
Occupancy and equipment	25,868	25,668
Other	76,100	78,796
Subtotal	157,198	165,684
Operating lease depreciation	0	0
Foreclosed real estate and repossessed assets, net	4,259	3,579
Other credit costs, net	9	25
Total non-interest expense	161,466	169,288
Income before income tax expense	36,663	38,440
Income tax expense (benefit)	8,823	13,510
Income after income tax expense	27,840	24,930
Income attributable to non-controlling interest	0	0
Preferred stock dividends	0	0
Impact of preferred stock redemption	0
Net income available to common stockholders	27,840	24,930
Total assets	8,325,213	8,876,967
Revenues from external customers:
Interest Income	111,817	109,833
Non-interest income	67,110	72,762
Total	178,927	182,595
Wholesale Banking
Interest income:
Loans and leases	151,525	123,726
Debt securities available for sale	0	0
Debt securities held to maturity	23	28
Loans held for sale and other	21	22
Funds transfer pricing - credits	7,748	5,357
Total interest income	159,317	129,133
Interest expense:
Deposits	1,434	325
Borrowings	17,398	9,932
Funds transfer pricing - charges	44,885	31,234
Total interest expense	63,717	41,491
Net interest income	95,600	87,642
Provision for credit losses	2,479	6,842
Net interest income after provision for credit losses	93,121	80,800
Non-interest income:
Fees and service charges	2,154	1,773
Card revenue	9	0
ATM revenue	1	0
Subtotal	2,164	1,773
Gains on sales of auto loans, net		0
Gains on sales of consumer real estate loans, net	0	0
Servicing fee income	369	338
Subtotal	369	338
Leasing and equipment finance	41,847	28,298
Other	607	310
Fees and other revenue	44,987	30,719
Gains (losses) on debt securities, net	63
Total non-interest income	45,050	30,719
Non-interest expense:
Compensation and employee benefits	24,288	22,433
Occupancy and equipment	4,907	4,896
Other	28,645	26,227
Subtotal	57,840	53,556
Operating lease depreciation	17,274	11,242
Foreclosed real estate and repossessed assets, net	650	688
Other credit costs, net	608	76
Total non-interest expense	76,372	65,562
Income before income tax expense	61,799	45,957
Income tax expense (benefit)	13,877	15,068
Income after income tax expense	47,922	30,889
Income attributable to non-controlling interest	2,663	2,308
Preferred stock dividends	0	0
Impact of preferred stock redemption	0
Net income available to common stockholders	45,259	28,581
Total assets	12,293,798	10,845,817
Revenues from external customers:
Interest Income	150,659	122,365
Non-interest income	45,050	30,719
Total	195,709	153,084
Enterprise Services
Interest income:
Loans and leases	(910)	(1,411)
Debt securities available for sale	10,123	7,980
Debt securities held to maturity	996	1,252
Loans held for sale and other	1,667	877
Funds transfer pricing - credits	(104,330)	(93,239)
Total interest income	(92,454)	(84,541)
Interest expense:
Deposits	3,221	1,348
Borrowings	(20,252)	(14,537)
Funds transfer pricing - charges	(83,114)	(65,507)
Total interest expense	(100,145)	(78,696)
Net interest income	7,691	(5,845)
Provision for credit losses	0	0
Net interest income after provision for credit losses	7,691	(5,845)
Non-interest income:
Fees and service charges	0	0
Card revenue	0	0
ATM revenue	0	0
Subtotal	0	0
Gains on sales of auto loans, net		0
Gains on sales of consumer real estate loans, net	0	0
Servicing fee income	0	0
Subtotal	0	0
Leasing and equipment finance	0	0
Other	44	33
Fees and other revenue	44	33
Gains (losses) on debt securities, net	0
Total non-interest income	44	33
Non-interest expense:
Compensation and employee benefits	44,322	40,645
Occupancy and equipment	9,739	9,036
Other	(45,926)	(40,807)
Subtotal	8,135	8,874
Operating lease depreciation	0	0
Foreclosed real estate and repossessed assets, net	7	282
Other credit costs, net	0	0
Total non-interest expense	8,142	9,156
Income before income tax expense	(407)	(14,968)
Income tax expense (benefit)	(1,069)	(7,735)
Income after income tax expense	662	(7,233)
Income attributable to non-controlling interest	0	0
Preferred stock dividends	4,106	4,847
Impact of preferred stock redemption	3,481
Net income available to common stockholders	(6,925)	(12,080)
Total assets	2,766,041	2,113,784
Revenues from external customers:
Interest Income	12,786	10,109
Non-interest income	44	33
Total	$ 12,830	$ 10,142

Accumulated Other Comprehensi79

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss)
Total other comprehensive income (loss), before tax	$ (37,164)	$ 4,532
Total other comprehensive income (loss), tax effect	8,830	(1,502)
Total other comprehensive income (loss), net of tax	(28,334)	3,030
Debt securities available for sale and interest-only strips
Net unrealized gains (losses) arising during the period, before tax	(37,892)	4,162
Net unrealized gains (losses) arising during the period, tax effect	9,538	(1,582)
Net unrealized gains (losses) arising during the period, net of tax	(28,354)	2,580
Reclassification of net (gains) losses from accumulated other comprehensive income (loss), before tax	713	(305)
Reclassification of net (gains) losses from accumulated other comprehensive income (loss), tax effect	(178)	116
Reclassification of net (gains) losses from accumulated other comprehensive income (loss), net of tax	535	(189)
Net unrealized gains (losses), before taxes	(37,179)	4,467
Net unrealized gains (losses), tax effect	9,360	(1,698)
Net unrealized gains (losses), net of tax	(27,819)	2,769
Net investment hedges
Net unrealized gains (losses) on net investment hedges, before tax	2,137	(504)
Net unrealized gains (losses) on net investment hedges, tax effect	(533)	191
Net unrealized gains (losses) on net investment hedges, net of tax	1,604	(313)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Foreign currency translation adjustment, before tax	(2,110)	581
Foreign currency translation adjustment, tax effect	0	0
Foreign currency translation adjustment, net of tax	(2,110)	581
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Reclassification of amortization of prior service cost, before tax	(12)	(12)
Reclassification of amortization of prior service cost, tax effect	3	5
Reclassification of amortization of prior service cost, net of tax	(9)	(7)
Total interest income
Debt securities available for sale and interest-only strips
Reclassification of net (gains) losses from accumulated other comprehensive income (loss), before tax	276	(48)
Reclassification of net (gains) losses from accumulated other comprehensive income (loss), tax effect	(69)	18
Reclassification of net (gains) losses from accumulated other comprehensive income (loss), net of tax	207	(30)
Other non-interest expense
Debt securities available for sale and interest-only strips
Reclassification of net (gains) losses from accumulated other comprehensive income (loss), before tax	437	(257)
Reclassification of net (gains) losses from accumulated other comprehensive income (loss), tax effect	(109)	98
Reclassification of net (gains) losses from accumulated other comprehensive income (loss), net of tax	$ 328	$ (159)

Components of Accumulated Other

Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Changes in accumulated other comprehensive income by component
Balance, beginning of period	$ (18,517)	$ (33,725)
Other comprehensive income (loss)	(28,860)	2,848
Amounts reclassified from accumulated other comprehensive income (loss)	526	182
Total other comprehensive income (loss), net of tax	(28,334)	3,030
Balance, end of period	(46,851)	(30,695)
Net Unrealized Gains (Losses) on Debt Securities Available for Sale and Interest-Only Strips
Changes in accumulated other comprehensive income by component
Balance, beginning of period	(16,353)	(28,601)
Other comprehensive income (loss)	(28,354)	2,580
Amounts reclassified from accumulated other comprehensive income (loss)	535	189
Total other comprehensive income (loss), net of tax	(27,819)	2,769
Balance, end of period	(44,172)	(25,832)
Net Unrealized Gains (Losses) on Net Investment Hedges
Changes in accumulated other comprehensive income by component
Balance, beginning of period	4,536	6,493
Other comprehensive income (loss)	1,604	(313)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive income (loss), net of tax	1,604	(313)
Balance, end of period	6,140	6,180
Foreign Currency Translation Adjustment
Changes in accumulated other comprehensive income by component
Balance, beginning of period	(6,843)	(11,764)
Other comprehensive income (loss)	(2,110)	581
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive income (loss), net of tax	(2,110)	581
Balance, end of period	(8,953)	(11,183)
Recognized Postretirement Prior Service Cost
Changes in accumulated other comprehensive income by component
Balance, beginning of period	143	147
Other comprehensive income (loss)	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	(9)	(7)
Total other comprehensive income (loss), net of tax	(9)	(7)
Balance, end of period	$ 134	$ 140