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Reportable Segments
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Reportable Segments Reportable Segments
 
The Corporation's reportable segments are Consumer Banking, Commercial Banking and Enterprise Services. Consumer Banking is comprised of all of the Corporation's consumer-facing businesses and includes retail banking, consumer lending, wealth management and small business banking. Commercial Banking, previously named Wholesale Banking, is comprised of commercial and industrial and commercial real estate banking and lease financing. Enterprise Services is comprised of (i) corporate treasury, which includes the Corporation'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) TCF Financial and (iv) eliminations.

The Corporation evaluates performance and allocates resources based on each reportable segment's net income or loss. The reportable segments follow GAAP as described in "Note 1. Basis of Presentation," 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. The Corporation generally accounts for inter-segment sales and transfers at cost.

Certain information for each of the reportable segments, including reconciliations of the Corporation's consolidated totals, was as follows:
(In thousands)Consumer BankingCommercial BankingEnterprise ServicesConsolidated
At or For the Year Ended December 31, 2020:
Net interest income$834,106 $697,190 $7,105 $1,538,401 
Provision for credit losses16,945 240,206 — 257,151 
Net interest income after provision for credit losses817,161 456,984 7,105 1,281,250 
Noninterest income318,029 186,304 11,730 516,063 
Noninterest expense852,733 430,158 244,480 1,527,371 
Income (loss) before income tax expense (benefit)282,457 213,130 (225,645)269,942 
Income tax expense (benefit)62,654 35,128 (57,881)39,901 
Income (loss) after income tax expense (benefit)219,803 178,002 (167,764)230,041 
Income attributable to non-controlling interest— 7,282 — 7,282 
Preferred stock dividends— — 9,975 9,975 
Net income (loss) available to common shareholders$219,803 $170,720 $(177,739)$212,784 
Total assets$13,663,990 $24,063,599 $10,074,898 $47,802,487 
Revenues from external customers:
Interest income$558,729 $1,027,896 $179,037 $1,765,662 
Noninterest income318,029 186,304 11,730 516,063 
Total$876,758 $1,214,200 $190,767 $2,281,725 
(In thousands)Consumer BankingCommercial BankingEnterprise ServicesConsolidated
At or For the Year Ended December 31, 2019:
Net interest income$676,552 $536,154 $76,326 $1,289,032 
Provision for credit losses16,550 48,732 — 65,282 
Net interest income after provision for credit losses660,002 487,422 76,326 1,223,750 
Noninterest income273,915 198,898 (7,281)465,532 
Noninterest expense753,904 383,390 194,821 1,332,115 
Income (loss) before income tax expense (benefit)180,013 302,930 (125,776)357,167 
Income tax expense (benefit)38,353 50,581 (38,693)50,241 
Income (loss) after income tax expense (benefit)141,660 252,349 (87,083)306,926 
Income attributable to non-controlling interest— 11,458 — 11,458 
Preferred stock dividends— — 9,975 9,975 
Net income (loss) available to common shareholders$141,660 $240,891 $(97,058)$285,493 
Total assets$14,224,545 $20,395,308 $12,031,700 $46,651,553 
Revenues from external customers:
Interest income$533,545 $919,091 $134,625 $1,587,261 
Noninterest income273,915 198,898 (7,281)465,532 
Total$807,460 $1,117,989 $127,344 $2,052,793 
(In thousands)Consumer BankingCommercial BankingEnterprise ServicesConsolidated
At or For the Year Ended December 31, 2018:
Net interest income (expense)$569,220 $383,031 $56,244 $1,008,495 
Provision for credit losses24,661 22,107 — 46,768 
Net interest income after provision for credit losses544,559 360,924 56,244 961,727 
Noninterest income262,797 190,442 1,158 454,397 
Noninterest expense669,967 308,727 35,706 1,014,400 
Income (loss) before income tax expense (benefit)137,389 242,639 21,696 401,724 
Income tax expense (benefit)31,645 52,675 1,776 86,096 
Income (loss) after income tax expense (benefit)105,744 189,964 19,920 315,628 
Income attributable to non-controlling interest— 11,270 — 11,270 
Preferred stock dividends— — 11,588 11,588 
Impact of preferred stock call— — 3,481 3,481 
Net income (loss) available to common shareholders$105,744 $178,694 $4,851 $289,289 
Total assets$6,414,228 $9,086,125 $8,199,259 $23,699,612 
Revenues from external customers:
Interest income$456,904 $636,108 $66,317 $1,159,329 
Noninterest income262,797 190,442 1,158 454,397 
Total$719,701 $826,550 $67,475 $1,613,726