v3.26.1
Revenue from Contracts with Customers - Summary of Noninterest Income (Loss) Disaggregated by Reportable Operating Segment and Revenue Stream (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts $ 10,375 $ 10,585 $ 21,029 $ 21,221
Bank card and other fees 8,743 8,754 16,731 16,418
Mortgage banking, net 8,914 8,602 17,848 17,373
Wealth management 10,922 9,638 21,315 19,181
Other, net 3,617 2,311 7,993 8,281
Total Noninterest Income 42,571 39,890 84,916 82,474
Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 10,375 10,585 21,029 21,221
Bank card and other fees 7,854 8,006 14,979 15,425
Wealth management 10,922 9,638 21,315 19,181
Other, net 2,407 2,442 5,078 7,907
Total Noninterest Income 31,558 30,671 62,401 63,734
Not Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Bank card and other fees 889 [1] 748 [1] 1,752 [2] 993 [2]
Mortgage banking, net 8,914 [1] 8,602 [1] 17,848 [2] 17,373 [2]
Other, net 1,210 [1] (131) [1] 2,915 [2] 374 [2]
Total Noninterest Income 11,013 [1] 9,219 [1] 22,515 [2] 18,740 [2]
General Banking Segment [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 10,299 10,562 20,884 21,177
Bank card and other fees 8,742 8,716 16,699 16,341
Mortgage banking, net 8,914 8,602 17,848 17,373
Wealth management 161 196 314 377
Other, net 3,397 2,164 7,580 7,986
Total Noninterest Income 31,513 30,240 63,325 63,254
General Banking Segment [Member] | Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 10,299 10,562 20,884 21,177
Bank card and other fees 7,853 7,968 14,947 15,348
Wealth management 161 196 314 377
Other, net 2,318 2,388 4,892 7,801
Total Noninterest Income 20,631 21,114 41,037 44,703
General Banking Segment [Member] | Not Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Bank card and other fees 889 [1] 748 [1] 1,752 [2] 993 [2]
Mortgage banking, net 8,914 [1] 8,602 [1] 17,848 [2] 17,373 [2]
Other, net 1,079 [1] (224) [1] 2,688 [2] 185 [2]
Total Noninterest Income 10,882 [1] 9,126 [1] 22,288 [2] 18,551 [2]
Wealth Management Segment [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 76 23 145 44
Bank card and other fees 1 38 32 77
Mortgage banking, net 0 0 0
Wealth management 10,761 9,442 21,001 18,804
Other, net 220 147 413 295
Total Noninterest Income 11,058 9,650 21,591 19,220
Wealth Management Segment [Member] | Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 76 23 145 44
Bank card and other fees 1 38 32 77
Wealth management 10,761 9,442 21,001 18,804
Other, net 89 54 186 106
Total Noninterest Income 10,927 9,557 21,364 19,031
Wealth Management Segment [Member] | Not Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Other, net 131 [1] 93 [1] 227 [2] 189 [2]
Total Noninterest Income $ 131 [1] $ 93 [1] $ 227 [2] $ 189 [2]
[1] Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and securities gains (losses), net.
[2] Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and securities gains (losses), net.