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Segment Information
 9 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
Segment Information Segment Information
The Company’s operations consist of three primary segments: community banking, specialty finance and wealth management.

The three reportable segments are strategic business units that are separately managed as they offer different products and services and have different marketing strategies. In addition, each segment’s customer base has varying characteristics and each segment has a different regulatory environment. While the Company’s management monitors each of the fifteen bank subsidiaries’ operations and profitability separately, these subsidiaries have been aggregated into one reportable operating segment due to the similarities in products and services, customer base, operations, profitability measures, and economic characteristics.

For purposes of internal segment profitability, management allocates certain intersegment and parent company balances. Management allocates a portion of revenues to the specialty finance segment related to loans and leases originated by the specialty finance segment and sold or assigned to the community banking segment. Similarly, for purposes of analyzing the contribution from the wealth management segment, management allocates a portion of the net interest income earned by the community banking segment on deposit balances of customers of the wealth management segment to the wealth management segment. See Note 9 — Deposits, for more information on these deposits. Finally, expenses incurred at the Wintrust parent company are allocated to each segment based on each segment's risk-weighted assets.

The segment financial information provided in the following table has been derived from the internal profitability reporting system used by management to monitor and manage the financial performance of the Company. The accounting policies of the segments are substantially similar to those described in “Summary of Significant Accounting Policies” in Note 1 of the Company’s 2020 Form 10-K. The Company evaluates segment performance based on after-tax profit or loss and other appropriate profitability measures common to each segment.
The following is a summary of certain operating information for reportable segments:
Three Months Ended$ Change in
Contribution		% Change  in
Contribution
(Dollars in thousands)September 30,
2021		September 30,
2020
Net interest income:
Community Banking$220,007 $196,803 $23,204 12 %
Specialty Finance52,659 46,454 6,205 13 
Wealth Management7,983 6,894 1,089 16 
Total Operating Segments280,649 250,151 30,498 12 
Intersegment Eliminations6,847 5,785 1,062 18 
Consolidated net interest income$287,496 $255,936 $31,560 12 %
Provision for credit losses:
Community Banking$(7,433)$23,342 $(30,775)NM
Specialty Finance(483)1,684 (2,167)NM
Wealth Management— — — — %
Total Operating Segments(7,916)25,026 (32,942)NM
Intersegment Eliminations— — — — 
Consolidated provision for credit losses$(7,916)$25,026 $(32,942)NM
Non-interest income:
Community Banking$94,292 $136,996 $(42,704)(31)%
Specialty Finance24,426 21,409 3,017 14 
Wealth Management33,557 26,152 7,405 28 
Total Operating Segments152,275 184,557 (32,282)(17)
Intersegment Eliminations(15,801)(13,964)(1,837)13 
Consolidated non-interest income$136,474 $170,593 $(34,119)(20)%
Net revenue:
Community Banking$314,299 $333,799 $(19,500)(6)%
Specialty Finance77,085 67,863 9,222 14 
Wealth Management41,540 33,046 8,494 26 
Total Operating Segments432,924 434,708 (1,784)0 
Intersegment Eliminations(8,954)(8,179)(775)9 
Consolidated net revenue$423,970 $426,529 $(2,559)(1)%
Segment profit:
Community Banking$68,790 $70,584 $(1,794)(3)%
Specialty Finance30,202 29,859 343 1 %
Wealth Management10,145 6,872 3,273 48 
Consolidated net income$109,137 $107,315 $1,822 2 %
Segment assets:
Community Banking$38,464,169 $35,729,021 $2,735,148 8 %
Specialty Finance7,918,933 6,732,765 1,186,168 18 
Wealth Management1,449,169 1,269,932 179,237 14 
Consolidated total assets$47,832,271 $43,731,718 $4,100,553 9 %
NM - Not meaningful
Nine Months Ended$ Change in
Contribution		% Change  in
Contribution
(Dollars in thousands)September 30,
2021		September 30,
2020
Net interest income:
Community Banking$643,175 $609,316 $33,859 6 %
Specialty Finance142,752 129,581 13,171 10 
Wealth Management23,197 23,272 (75)0 
Total Operating Segments809,124 762,169 46,955 6 
Intersegment Eliminations19,857 18,341 1,516 8 
Consolidated net interest income$828,981 $780,510 $48,471 6 %
Provision for credit losses:
Community Banking$(69,168)$207,168 $(276,336)NM
Specialty Finance606 5,872 (5,266)(90)%
Wealth Management— — — — 
Total Operating Segments(68,562)213,040 (281,602)NM
Intersegment Eliminations— — — — 
Consolidated provision for credit losses$(68,562)$213,040 $(281,602)NM
Non-interest income:
Community Banking$331,970 $347,697 $(15,727)(5)%
Specialty Finance69,999 64,548 5,451 8 
Wealth Management95,651 74,747 20,904 28 
Total Operating Segments497,620 486,992 10,628 2 
Intersegment Eliminations(45,267)(41,164)(4,103)10 
Consolidated non-interest income$452,353 $445,828 $6,525 1 %
Net revenue:
Community Banking$975,145 $957,013 $18,132 2 %
Specialty Finance212,751 194,129 18,622 10 
Wealth Management118,848 98,019 20,829 21 
Total Operating Segments1,306,744 1,249,161 57,583 5 
Intersegment Eliminations(25,410)(22,823)(2,587)11 
Consolidated net revenue$1,281,334 $1,226,338 $54,996 4 %
Segment profit:
Community Banking$263,343 $97,858 $165,485 NM
Specialty Finance77,955 74,680 3,275 4 %
Wealth Management26,096 19,248 6,848 36 
Consolidated net income$367,394 $191,786 $175,608 92 %