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Segment Information
 12 Months Ended
Dec. 31, 2022
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 (10) “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 tables 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 Note (1) “Summary of Significant Accounting Policies”. 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:

(In thousands)Community
Banking		Specialty
Finance		Wealth
Management		Total Operating SegmentsIntersegment EliminationsConsolidated
2022
Net interest income$1,180,198 $246,681 $38,304 $1,465,183 $30,179 $1,495,362 
Provision for credit losses74,184 4,405 — 78,589 — 78,589 
Non-interest income298,572 97,701 124,609 520,882 (59,829)461,053 
Non-interest expense926,298 172,784 107,839 1,206,921 (29,650)1,177,271 
Income tax expense128,939 46,286 15,648 190,873 — 190,873 
Net income$349,349 $120,907 $39,426 $509,682 $— $509,682 
Total assets at end of year$41,368,200 $9,826,254 $1,755,195 $52,949,649 $— $52,949,649 
2021
Net interest income$868,477 $197,958 $31,939 $1,098,374 $26,583 $1,124,957 
Provision for credit losses(60,309)1,046 — (59,263)— (59,263)
Non-interest income422,698 95,822 128,951 647,471 (61,351)586,120 
Non-interest expense912,296 143,526 111,490 1,167,312 (34,768)1,132,544 
Income tax expense 120,092 40,040 11,513 171,645 — 171,645 
Net income$319,096 $109,168 $37,887 $466,151 $— $466,151 
Total assets at end of year$40,253,818 $8,382,722 $1,505,603 $50,142,143 $— $50,142,143 
2020
Net interest income$808,443 $177,025 $30,612 $1,016,080 $23,827 $1,039,907 
Provision for credit losses206,774 7,446 — 214,220 — 214,220 
Non-interest income469,187 86,268 103,438 658,893 (54,704)604,189 
Non-interest expense855,797 118,560 96,615 1,070,972 (30,877)1,040,095 
Income tax expense 51,439 36,956 8,396 96,791 — 96,791 
Net income$163,620 $100,331 $29,039 $292,990 $— $292,990 
Total assets at end of year$36,769,640 $7,015,590 $1,295,538 $45,080,768 $— $45,080,768