Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Total	Series C Preferred Stock	Total	Total Series C Preferred Stock	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Series C Preferred Stock	Accumulated Other Comprehensive Income (Loss)	Other	Non-controlling Interest	Cumulative Effect, Period of Adoption, Adjustment	[1]	Cumulative Effect, Period of Adoption, Adjustment Total	[1]	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings	[1]	Cumulative Effect, Period of Adoption, Adjustment Non-controlling Interest	[1]	Cumulative Effect, Period of Adoption, Adjusted Balance	Cumulative Effect, Period of Adoption, Adjusted Balance Total	Cumulative Effect, Period of Adoption, Adjusted Balance Preferred Stock	Cumulative Effect, Period of Adoption, Adjusted Balance Common Stock	Cumulative Effect, Period of Adoption, Adjusted Balance Additional Paid-in Capital	Cumulative Effect, Period of Adoption, Adjusted Balance Retained Earnings	Cumulative Effect, Period of Adoption, Adjusted Balance Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjusted Balance Other	Cumulative Effect, Period of Adoption, Adjusted Balance Non-controlling Interest
Balance (in shares) at Dec. 31, 2018					7,000	88,198,460
Balance at Dec. 31, 2018	$ 2,556,260		$ 2,537,801		$ 169,302	$ 88,198	$ 798,627	$ 1,766,994		$ (33,138)	$ (252,182)	$ 18,459
Increase (Decrease) in Equity
Net income	167,492		160,921					160,921				6,571
Other comprehensive income (loss), net of tax	70,472		70,472							70,472
Net investment by (distribution to) non-controlling interest	$ (172)											(172)
Repurchases of shares of common stock (in shares)	(673,192)
Repurchases of shares of common stock	$ (26,495)		(26,495)								(26,495)
Dividends on 5.70% Series C Preferred Stock		$ (4,987)		$ (4,987)				(4,987)
Dividends on common stock	(48,620)		(48,620)					(48,620)
Stock compensation plans, net of tax (in shares)						(254,600)
Stock compensation plans, net of tax	(3,433)		(3,433)			$ (254)	(18,696)				15,517
Change in shares held in trust for deferred compensation plans, at cost							1,857				(1,857)
Balance (in shares) at Jun. 30, 2019					7,000	87,943,860
Balance at Jun. 30, 2019	2,710,517		2,685,659		$ 169,302	$ 87,944	781,788	1,874,308		37,334	(265,017)	24,858
Balance (in shares) at Mar. 31, 2019					7,000	88,063,038
Balance at Mar. 31, 2019	2,645,845		2,616,393		$ 169,302	$ 88,063	789,467	1,810,701		5,481	(246,621)	29,452
Increase (Decrease) in Equity
Net income	94,043		90,427					90,427				3,616
Other comprehensive income (loss), net of tax	31,853		31,853							31,853
Net investment by (distribution to) non-controlling interest	$ (8,210)											(8,210)
Repurchases of shares of common stock (in shares)	(673,192)
Repurchases of shares of common stock	$ (26,495)		(26,495)								(26,495)
Dividends on 5.70% Series C Preferred Stock		(2,494)		(2,494)					$ (2,494)
Dividends on common stock	(24,326)		(24,326)					(24,326)
Common shares purchased by TCF employee benefit plans	0
Stock compensation plans, net of tax (in shares)						(119,178)
Stock compensation plans, net of tax	301		301			$ (119)	(8,306)				8,726
Change in shares held in trust for deferred compensation plans, at cost							627				(627)
Balance (in shares) at Jun. 30, 2019					7,000	87,943,860
Balance at Jun. 30, 2019	2,710,517		2,685,659		$ 169,302	$ 87,944	781,788	1,874,308		37,334	(265,017)	24,858
Balance (in shares) at Dec. 31, 2019					7,000	152,965,571																	7,000	152,965,571
Balance at Dec. 31, 2019	5,727,241		5,707,015		$ 169,302	$ 152,966	3,462,080	1,896,427		54,277	(28,037)	20,226	$ (159,249)		$ (159,323)		$ (159,323)		$ 74		$ 5,567,992	$ 5,547,692	$ 169,302	$ 152,966	$ 3,462,080	$ 1,737,104	$ 54,277	$ (28,037)	$ 20,300
Increase (Decrease) in Equity
Net income	80,049		75,663					75,663				4,386
Other comprehensive income (loss), net of tax	144,131		144,131							144,131
Net investment by (distribution to) non-controlling interest	$ (1,386)											(1,386)
Repurchases of shares of common stock (in shares)	(873,376)					(873,376)
Repurchases of shares of common stock	$ (33,098)		(33,098)			$ (873)	(32,225)
Dividends on 5.70% Series C Preferred Stock		(4,987)		(4,987)				(4,987)
Dividends on common stock	(107,300)		(107,300)					(107,300)
Stock compensation plans, net of tax (in shares)						140,911
Stock compensation plans, net of tax	13,154		13,154			$ 140	13,014
Change in shares held in trust for deferred compensation plans, at cost							(944)				944
Balance (in shares) at Jun. 30, 2020					7,000	152,233,106
Balance at Jun. 30, 2020	5,658,555		5,635,255		$ 169,302	$ 152,233	3,441,925	1,700,480		198,408	(27,093)	23,300
Balance (in shares) at Mar. 31, 2020					7,000	152,185,984
Balance at Mar. 31, 2020	5,655,833		5,625,684		$ 169,302	$ 152,186	3,433,234	1,732,932		166,170	(28,140)	30,149
Increase (Decrease) in Equity
Net income	26,233		23,764					23,764				2,469
Other comprehensive income (loss), net of tax	32,238		32,238							32,238
Net investment by (distribution to) non-controlling interest	$ (9,318)											(9,318)
Repurchases of shares of common stock (in shares)	0
Dividends on 5.70% Series C Preferred Stock		$ (2,494)		$ (2,494)					$ (2,494)
Dividends on common stock	$ (53,722)		(53,722)					(53,722)
Stock compensation plans, net of tax (in shares)						47,122
Stock compensation plans, net of tax	9,785		9,785			$ 47	9,738
Change in shares held in trust for deferred compensation plans, at cost							(1,047)				1,047
Balance (in shares) at Jun. 30, 2020					7,000	152,233,106
Balance at Jun. 30, 2020	$ 5,658,555		$ 5,635,255		$ 169,302	$ 152,233	$ 3,441,925	$ 1,700,480		$ 198,408	$ (27,093)	$ 23,300

[1] Note 3. Summary of Significant Accounting Policies" for further information