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Leases - Components of the Trustmark's Net Investment in its Sales-Type and Direct Financing Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Capital Leases, Net Investment in Direct Financing Leases [Abstract]    
Leases receivable $ 409,347 $ 282,771
Unearned income (64,921) (45,585)
Initial direct costs 3,093 2,252
Unguaranteed lease residual 16,806 7,084
Total net investment $ 364,325 $ 246,522