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Segment Information
 3 Months Ended
Mar. 31, 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)March 31,
2021		March 31,
2020
Net interest income:
Community Banking$203,489 $206,835 $(3,346)(2)%
Specialty Finance44,899 40,712 4,187 10 
Wealth Management7,449 7,792 (343)(4)
Total Operating Segments255,837 255,339 498 — 
Intersegment Eliminations6,058 6,104 (46)(1)
Consolidated net interest income$261,895 $261,443 $452 — %
Provision for credit losses:
Community Banking$(46,572)$51,677 $(98,249)(190)%
Specialty Finance1,225 1,284 (59)(5)
Wealth Management— — — — 
Total Operating Segments(45,347)52,961 (98,308)(186)
Intersegment Eliminations— — — — 
Consolidated provision for credit losses$(45,347)$52,961 $(98,308)(186)%
Non-interest income:
Community Banking$147,268 $81,003 $66,265 82 %
Specialty Finance23,109 21,308 1,801 8 
Wealth Management30,251 24,130 6,121 25 
Total Operating Segments200,628 126,441 74,187 59 
Intersegment Eliminations(14,122)(13,199)(923)7 
Consolidated non-interest income$186,506 $113,242 $73,264 65 %
Net revenue:
Community Banking$350,757 $287,838 $62,919 22 %
Specialty Finance68,008 62,020 5,988 10 
Wealth Management37,700 31,922 5,778 18 
Total Operating Segments456,465 381,780 74,685 20 
Intersegment Eliminations(8,064)(7,095)(969)14 
Consolidated net revenue$448,401 $374,685 $73,716 20 %
Segment profit:
Community Banking$121,801 $34,589 $87,212 252 %
Specialty Finance23,903 22,133 1,770 8 
Wealth Management7,444 6,090 1,354 22 
Consolidated net income$153,148 $62,812 $90,336 144 %
Segment assets:
Community Banking$37,102,603 $31,499,899 $5,602,704 18 %
Specialty Finance7,174,269 6,133,548 1,040,721 17 
Wealth Management1,405,330 1,166,400 238,930 20 
Consolidated total assets$45,682,202 $38,799,847 $6,882,355 18 %