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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts $ 11,251 $ 11,272 $ 32,472 $ 33,154
Bank card and other fees 8,318 7,931 24,736 24,584
Mortgage banking, net 8,182 6,119 25,555 19,238
Wealth management 9,798 9,288 28,979 27,932
Other, net 2,382 2,952 10,663 13,515
Securities gains (losses), net 0 0 0 (182,792)
Total Noninterest Income (loss) 39,931 37,562 122,405 (64,369)
Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 11,251 11,272 32,472 33,154
Bank card and other fees 7,683 7,713 23,108 23,408
Wealth management 9,798 9,288 28,979 27,932
Other, net 2,836 3,195 10,743 13,874
Total Noninterest Income (loss) 31,568 31,468 95,302 98,368
Not Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Bank card and other fees 635 [1] 218 [1] 1,628 [2] 1,176 [2]
Mortgage banking, net 8,182 [1] 6,119 [1] 25,555 [2] 19,238 [2]
Other, net (454) [1] (243) [1] (80) [2] (359) [2]
Securities gains (losses), net [2]       (182,792)
Total Noninterest Income (loss) 8,363 [1] 6,094 [1] 27,103 [2] (162,737) [2]
General Banking Segment [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 11,188 11,250 32,365 33,089
Bank card and other fees 8,260 7,879 24,601 24,457
Mortgage banking, net 8,182 6,119 25,555 19,238
Wealth management 185 175 562 538
Other, net 2,200 2,799 10,186 13,094
Securities gains (losses), net       (182,792)
Total Noninterest Income (loss) 30,015 28,222 93,269 (92,376)
General Banking Segment [Member] | Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 11,188 11,250 32,365 33,089
Bank card and other fees 7,625 7,661 22,973 23,281
Wealth management 185 175 562 538
Other, net 2,753 3,136 10,554 13,735
Total Noninterest Income (loss) 21,751 22,222 66,454 70,643
General Banking Segment [Member] | Not Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Bank card and other fees 635 [1] 218 [1] 1,628 [2] 1,176 [2]
Mortgage banking, net 8,182 [1] 6,119 [1] 25,555 [2] 19,238 [2]
Other, net (553) [1] (337) [1] (368) [2] (641) [2]
Securities gains (losses), net [2]       (182,792)
Total Noninterest Income (loss) 8,264 [1] 6,000 [1] 26,815 [2] (163,019) [2]
Wealth Management Segment [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 63 22 107 65
Bank card and other fees 58 52 135 127
Mortgage banking, net 0 0 0 0
Wealth management 9,613 9,113 28,417 27,394
Other, net 182 153 477 421
Securities gains (losses), net       0
Total Noninterest Income (loss) 9,916 9,340 29,136 28,007
Wealth Management Segment [Member] | Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 63 22 107 65
Bank card and other fees 58 52 135 127
Wealth management 9,613 9,113 28,417 27,394
Other, net 83 59 189 139
Total Noninterest Income (loss) 9,817 9,246 28,848 27,725
Wealth Management Segment [Member] | Not Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Other, net 99 [1] 94 [1] 288 [2] 282 [2]
Total Noninterest Income (loss) $ 99 [1] $ 94 [1] $ 288 [2] $ 282 [2]
[1] Noninterest income (loss) 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 (loss) 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.