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Revenue from Contracts with Customers - Summary of Noninterest Income Disaggregated by Reportable Operating Segment and Revenue Stream (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts $ 11,074 $ 11,318 $ 32,105 $ 30,995
Bank card and other fees 8,217 9,305 24,937 27,914
Mortgage banking, net 6,458 6,876 20,697 24,898
Insurance commissions 15,303 13,911 44,372 41,702
Wealth management 8,773 8,778 26,435 26,934
Other, net 2,399 2,418 8,608 7,531
Total Noninterest Income 52,224 52,606 157,154 159,974
Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 11,074 11,318 32,105 30,995
Bank card and other fees 7,344 7,657 23,047 23,761
Insurance commissions 15,303 13,911 44,372 41,702
Wealth management 8,773 8,778 26,435 26,934
Other, net 2,884 2,169 9,839 6,606
Total Noninterest Income 45,378 43,833 135,798 129,998
Not Topic 606 [Member        
Revenue From Contract With Customer [Line Items]        
Bank card and other fees [1] 873 1,648 1,890 4,153
Mortgage banking, net [1] 6,458 6,876 20,697 24,898
Other, net [1] (485) 249 (1,231) 925
Total Noninterest Income [1] 6,846 8,773 21,356 29,976
General Banking Segment [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 11,052 11,296 32,040 30,932
Bank card and other fees 8,205 9,292 24,901 27,879
Mortgage banking, net 6,458 6,876 20,697 24,898
Wealth management 202 263 650 468
Other, net 2,264 1,963 7,247 6,993
Total Noninterest Income 28,181 29,690 85,535 91,170
General Banking Segment [Member] | Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 11,052 11,296 32,040 30,932
Bank card and other fees 7,332 7,644 23,011 23,726
Wealth management 202 263 650 468
Other, net 2,843 1,724 8,763 6,097
Total Noninterest Income 21,429 20,927 64,464 61,223
General Banking Segment [Member] | Not Topic 606 [Member        
Revenue From Contract With Customer [Line Items]        
Bank card and other fees [1] 873 1,648 1,890 4,153
Mortgage banking, net [1] 6,458 6,876 20,697 24,898
Other, net [1] (579) 239 (1,516) 896
Total Noninterest Income [1] 6,752 8,763 21,071 29,947
Wealth Management Segment [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 22 22 65 63
Bank card and other fees 12 13 36 35
Wealth management 8,571 8,515 25,785 26,466
Other, net 135 457 407 541
Total Noninterest Income 8,740 9,007 26,293 27,105
Wealth Management Segment [Member] | Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Service charges on deposit accounts 22 22 65 63
Bank card and other fees 12 13 36 35
Wealth management 8,571 8,515 25,785 26,466
Other, net 41 447 122 512
Total Noninterest Income 8,646 8,997 26,008 27,076
Wealth Management Segment [Member] | Not Topic 606 [Member        
Revenue From Contract With Customer [Line Items]        
Other, net [1] 94 10 285 29
Total Noninterest Income [1] 94 10 285 29
Insurance Segment [Member]        
Revenue From Contract With Customer [Line Items]        
Insurance commissions 15,303 13,911 44,372 41,702
Other, net   (2) 954 (3)
Total Noninterest Income 15,303 13,909 45,326 41,699
Insurance Segment [Member] | Topic 606 [Member]        
Revenue From Contract With Customer [Line Items]        
Insurance commissions 15,303 13,911 44,372 41,702
Other, net   (2) 954 (3)
Total Noninterest Income $ 15,303 13,909 $ 45,326 41,699
Insurance Segment [Member] | Not Topic 606 [Member        
Revenue From Contract With Customer [Line Items]        
Total Noninterest Income [1]   $ 0   $ 0
[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, accretion of the FDIC indemnification asset, 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 security gains (losses), net.