Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income
Interest and fees on loans and leases	$ 417,370	$ 269,167	$ 983,890	$ 806,935
Interest on investment securities:
Taxable	31,038	11,498	69,745	27,491
Tax-exempt	3,385	4,328	7,277	12,991
Interest on loans held-for-sale	1,408	3,625	2,832	5,281
Interest on other earning assets	6,607	3,089	13,739	8,722
Total interest income	459,808	291,707	1,077,483	861,420
Interest expense
Interest on deposits	70,900	27,479	149,154	74,228
Interest on borrowings	17,115	10,726	48,050	31,850
Total interest expense	88,015	38,205	197,204	106,078
Net interest income	371,793	253,502	880,279	755,342
Provision for credit losses	27,188	2,270	50,879	27,874
Net interest income after provision for credit losses	344,605	251,232	829,400	727,468
Noninterest income
Noninterest income	49,631	55,492	154,903	162,636
Net (losses) gains on sales of loans and leases	(5,984)	8,502	13,374	24,900
Net gains (losses) on investment securities	5,900	94	7,417	181
Other	(12,309)	6,243	(312)	20,620
Total noninterest income	94,258	112,064	307,480	330,529
Noninterest expense
Compensation and employee benefits	155,745	124,996	395,953	372,174
Occupancy and equipment	49,229	42,337	132,789	123,562
Lease financing equipment depreciation	19,408	19,525	57,797	54,744
Net foreclosed real estate and repossessed assets	2,203	3,880	9,281	12,654
Merger-related expenses	111,259	0	124,943	0
Other	87,776	55,685	194,781	201,308
Total noninterest expense	425,620	246,423	915,544	764,442
Income before income tax expense	13,243	116,873	221,336	293,555
Income tax (benefit) expense	(11,735)	28,034	28,866	66,083
Income after income tax (benefit) expense	24,978	88,839	192,470	227,472
Income attributable to non-controlling interest	2,830	2,643	9,401	8,766
Net income attributable to TCF Financial Corporation	22,148	86,196	183,069	218,706
Preferred stock dividends	2,494	2,494	7,481	9,094
Impact of preferred stock redemption	0	0	0	3,481
Net income available to common shareholders	$ 19,654	$ 83,702	$ 175,588	$ 206,131
Earnings per common share:
Basic earnings per common share (in usd per share)	$ 0.15	$ 1.00	$ 1.79	$ 2.44
Diluted earnings per common share (in usd per share)	$ 0.15	$ 1.00	$ 1.79	$ 2.43
Fees and service charges on deposit accounts
Noninterest income
Noninterest income	$ 34,384	$ 29,175	$ 88,504	$ 83,703
Leasing revenue
Noninterest income
Noninterest income	39,590	41,944	117,032	121,001
Wealth management revenue
Noninterest income
Noninterest income	4,241	0	4,241	0
Card and ATM revenue
Noninterest income
Noninterest income	23,315	20,074	62,470	58,313
Servicing fee revenue
Noninterest income
Noninterest income	$ 5,121	$ 6,032	$ 14,754	$ 21,811