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Segment Information
 12 Months Ended
Dec. 31, 2024
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 sixteen 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”.

Our Chief Executive Officer is our chief operating decision maker (“CODM”). The CODM uses income before taxes to review segment performance and allocate resources for each reportable segment. Financial information regarding each significant segment expense outlined below is regularly provided (at least monthly) to the CODM. For community banking and specialty finance segments, ‘Interest expense’ is a significant segment expense. Additionally, for each of the three reportable segments, ‘Salaries’, ‘Commissions and incentive compensation’ and ‘Benefits’ are significant segment expenses.
The following is a summary of certain operating information for reportable segments:

(In thousands)
Community
Banking		Specialty
Finance		Wealth
Management		Total Operating SegmentsIntersegment EliminationsConsolidated
2024
Interest income$3,001,500 $405,317 $30,765 $3,437,582 $40,015 $3,477,597 
Interest expense1,465,237 49,030 795 1,515,062 — 1,515,062 
Net interest income1,536,263 356,287 29,970 1,922,520 40,015 1,962,535 
Provision for credit losses88,345 12,702 — 101,047 — 101,047 
Non-interest income279,845 119,339 168,134 567,318 (78,993)488,325 
Non-interest expense:
Salaries364,144 61,070 38,989 464,203 1,769 465,972 
Commissions and incentive compensation130,516 36,130 48,873 215,519 — 215,519 
Benefits106,994 18,686 9,937 135,617 — 135,617 
Other segment expenses(1)
500,327 91,479 34,557 626,363 (40,747)585,616 
Total non-interest expense1,101,981 207,365 132,356 1,441,702 (38,978)1,402,724 
Income before taxes625,782 255,559 65,748 947,089 — 947,089 
Income tax expense167,072 69,214 15,758 252,044 — 252,044 
Net income$458,710 $186,345 $49,990 $695,045 $— $695,045 
Total assets at end of year$52,500,643 $11,234,012 $1,145,013 $64,879,668 $— $64,879,668 
2023
Interest income$2,462,103 $362,035 $33,867 $2,858,005 $35,109 $2,893,114 
Interest expense1,021,128 32,991 1,131 1,055,250 — 1,055,250 
Net interest income1,440,975 329,044 32,736 1,802,755 35,109 1,837,864 
Provision for credit losses104,895 9,495 — 114,390 — 114,390 
Non-interest income263,023 105,992 136,561 505,576 (71,470)434,106 
Non-interest expense:
Salaries340,993 57,024 39,129 437,146 1,666 438,812 
Commissions and incentive compensation110,986 30,395 40,720 182,101 — 182,101 
Benefits100,190 17,070 9,840 127,100 — 127,100 
Other segment expenses(1)
484,263 82,024 36,226 602,513 (38,027)564,486 
Total non-interest expense1,036,432 186,513 125,915 1,348,860 (36,361)1,312,499 
Income before taxes562,671 239,028 43,382 845,081 — 845,081 
Income tax expense 148,612 63,484 10,359 222,455 — 222,455 
Net income$414,059 $175,544 $33,023 $622,626 $— $622,626 
Total assets at end of year$44,355,786 $10,664,887 $1,239,261 $56,259,934 $— $56,259,934 
2022
Interest income$1,411,485 $266,238 $39,541 $1,717,264 $30,179 $1,747,443 
Interest expense231,287 19,557 1,237 252,081 — 252,081 
Net interest income1,180,198 246,681 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 expense:
Salaries306,062 45,043 29,526 380,631 1,550 382,181 
Commissions and incentive compensation127,178 31,329 39,366 197,873 — 197,873 
Benefits91,875 15,812 8,366 116,053 — 116,053 
Other segment expenses(1)
401,183 80,600 30,581 512,364 (31,200)481,164 
Total non-interest expense926,298 172,784 107,839 1,206,921 (29,650)1,177,271 
Income before taxes478,288 167,193 55,074 700,555 — 700,555 
Income tax expense 128,939 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 
(1)Other segment items include non-interest expense categories such as ‘Software & Equipment’, ‘Data processing’, ‘Advertising and Marketing’, ‘FDIC Insurance’, and ‘Occupancy’. See “Non-Interest Expense” under Management’s Discussion and Analysis of Financial Condition and Results of Operations in Item 7 of this Annual Report on Form 10-K for further discussion on non-interest expense.