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
Mar. 31, 2026
Mar. 31, 2025
Revenue From Contract With Customer [Line Items]    
Service charges on deposit accounts $ 10,654 $ 10,636
Bank card and other fees 7,988 7,664
Mortgage banking, net 8,934 8,771
Wealth management 10,393 9,543
Other, net 4,376 5,970
Total Noninterest Income 42,345 42,584
Topic 606 [Member]    
Revenue From Contract With Customer [Line Items]    
Service charges on deposit accounts 10,654 10,636
Bank card and other fees 7,125 7,419
Wealth management 10,393 9,543
Other, net 2,671 5,465
Total Noninterest Income 30,843 33,063
Not Topic 606 [Member]    
Revenue From Contract With Customer [Line Items]    
Bank card and other fees [1] 863 245
Mortgage banking, net [1] 8,934 8,771
Other, net [1] 1,705 505
Total Noninterest Income [1] 11,502 9,521
General Banking Segment [Member]    
Revenue From Contract With Customer [Line Items]    
Service charges on deposit accounts 10,585 10,615
Bank card and other fees 7,957 7,625
Mortgage banking, net 8,934 8,771
Wealth management 153 181
Other, net 4,183 5,822
Total Noninterest Income 31,812 33,014
General Banking Segment [Member] | Topic 606 [Member]    
Revenue From Contract With Customer [Line Items]    
Service charges on deposit accounts 10,585 10,615
Bank card and other fees 7,094 7,380
Wealth management 153 181
Other, net 2,574 5,413
Total Noninterest Income 20,406 23,589
General Banking Segment [Member] | Not Topic 606 [Member]    
Revenue From Contract With Customer [Line Items]    
Bank card and other fees [1] 863 245
Mortgage banking, net [1] 8,934 8,771
Other, net [1] 1,609 409
Total Noninterest Income [1] 11,406 9,425
Wealth Management Segment [Member]    
Revenue From Contract With Customer [Line Items]    
Service charges on deposit accounts 69 21
Bank card and other fees 31 39
Mortgage banking, net 0 0
Wealth management 10,240 9,362
Other, net 193 148
Total Noninterest Income 10,533 9,570
Wealth Management Segment [Member] | Topic 606 [Member]    
Revenue From Contract With Customer [Line Items]    
Service charges on deposit accounts 69 21
Bank card and other fees 31 39
Wealth management 10,240 9,362
Other, net 97 52
Total Noninterest Income 10,437 9,474
Wealth Management Segment [Member] | Not Topic 606 [Member]    
Revenue From Contract With Customer [Line Items]    
Other, net [1] 96 96
Total Noninterest Income [1] $ 96 $ 96
[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.