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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
Mar. 31, 2023
Mar. 31, 2022
Revenue From Contract With Customer [Line Items]    
Service charges on deposit accounts $ 10,336 $ 9,451
Bank card and other fees 7,803 8,442
Mortgage banking, net 7,639 9,873
Insurance commissions 14,305 14,089
Wealth management 8,780 9,054
Other, net 2,514 3,206
Total Noninterest Income 51,377 54,115
Topic 606 [Member]    
Revenue From Contract With Customer [Line Items]    
Service charges on deposit accounts 10,336 9,451
Bank card and other fees 7,654 7,427
Insurance commissions 14,305 14,089
Wealth management 8,780 9,054
Other, net 3,027 2,542
Total Noninterest Income 44,102 42,563
Not Topic 606 [Member    
Revenue From Contract With Customer [Line Items]    
Bank card and other fees [1] 149 1,015
Mortgage banking, net [1] 7,639 9,873
Other, net [1] (513) 664
Total Noninterest Income [1] 7,275 11,552
General Banking Segment [Member]    
Revenue From Contract With Customer [Line Items]    
Service charges on deposit accounts 10,315 9,431
Bank card and other fees 7,792 8,432
Mortgage banking, net 7,639 9,873
Wealth management 233 24
Other, net 2,380 3,175
Total Noninterest Income 28,359 30,935
General Banking Segment [Member] | Topic 606 [Member]    
Revenue From Contract With Customer [Line Items]    
Service charges on deposit accounts 10,315 9,431
Bank card and other fees 7,643 7,417
Wealth management 233 24
Other, net 2,988 2,518
Total Noninterest Income 21,179 19,390
General Banking Segment [Member] | Not Topic 606 [Member    
Revenue From Contract With Customer [Line Items]    
Bank card and other fees [1] 149 1,015
Mortgage banking, net [1] 7,639 9,873
Other, net [1] (608) 657
Total Noninterest Income [1] 7,180 11,545
Wealth Management Segment [Member]    
Revenue From Contract With Customer [Line Items]    
Service charges on deposit accounts 21 20
Bank card and other fees 11 10
Wealth management 8,547 9,030
Other, net 140 39
Total Noninterest Income 8,719 9,099
Wealth Management Segment [Member] | Topic 606 [Member]    
Revenue From Contract With Customer [Line Items]    
Service charges on deposit accounts 21 20
Bank card and other fees 11 10
Wealth management 8,547 9,030
Other, net 45 32
Total Noninterest Income 8,624 9,092
Wealth Management Segment [Member] | Not Topic 606 [Member    
Revenue From Contract With Customer [Line Items]    
Other, net [1] 95 7
Total Noninterest Income [1] 95 7
Insurance Segment [Member]    
Revenue From Contract With Customer [Line Items]    
Insurance commissions 14,305 14,089
Other, net (6) (8)
Total Noninterest Income 14,299 14,081
Insurance Segment [Member] | Topic 606 [Member]    
Revenue From Contract With Customer [Line Items]    
Insurance commissions 14,305 14,089
Other, net (6) (8)
Total Noninterest Income $ 14,299 14,081
Insurance Segment [Member] | Not Topic 606 [Member    
Revenue From Contract With Customer [Line Items]    
Total Noninterest Income [1]   $ 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.