XML 54 R39.htm IDEA: XBRL DOCUMENT
v3.25.4

Mortgage Banking (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2025
Mortgage Banking [Abstract] |
Schedule of Activity in the Mortgage Servicing Rights | The activity in the MSR is detailed in the table below for the periods presented ($ in thousands):
|  | Years Ended December 31, |
|  | 2025 |  |  | 2024 |
Balance at beginning of period |  | $ | 139,317 |  |  | $ | 131,870 |
Origination of servicing assets |  |  | 15,052 |  |  |  | 13,291 |
Change in fair value: |  |  |  |  |  |
Due to market changes |  |  | (9,840 | ) |  |  | 5,801 |
Due to runoff |  |  | (13,240 | ) |  |  | (11,645 | )
Balance at end of period |  | $ | 131,289 |  |  | $ | 139,317 |
Schedule of Mortgage Loans Sold and Serviced for Others | The table below details the mortgage loans sold and serviced for others at December 31, 2025 and 2024 ($ in thousands):
|  | December 31, |
|  | 2025 |  |  | 2024 |
Federal National Mortgage Association |  | $ | 4,745,556 |  |  | $ | 4,821,246 |
Government National Mortgage Association |  |  | 3,872,151 |  |  |  | 3,695,419 |
Federal Home Loan Mortgage Corporation |  |  | 314,383 |  |  |  | 213,358 |
Other |  |  | 23,872 |  |  |  | 32,686 |
Total mortgage loans sold and serviced for others |  | $ | 8,955,962 |  |  | $ | 8,762,709 |

X
- Definition Tabular disclosure of mortgage loans sold and serviced for others. + References No definition available. + Details
Name: | trmk_ScheduleOfMortgageLoansSoldAndServicedForOthersTableTextBlock
Namespace Prefix: | trmk_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_MortgageBankingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the activity in the balance of servicing assets (including a description of where changes in fair value are reported in the statement of income for each period for which results of operations are presented), including but not limited to, the following: beginning and ending balances, additions (for instance, through purchases of servicing assets), disposals, changes in fair value during the period resulting from changes in inputs or assumptions used in the valuation model, other changes in fair value along with a description of those changes, and other changes that affect the balance along with a description of those changes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-3 + Details
Name: | us-gaap_ScheduleOfServicingAssetsAtFairValueTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration