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Retirement Benefit Plans (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |
Newly eligible associates initial savings rate | 3.00% |  |
First 1% Of Contribution Saved [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Matching percentage | 100.00% |  |
Percentage of compensation saved | 1.00% |  |
Next 5% Of Contribution Saved [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Matching percentage | 50.00% |  |
Percentage of compensation saved | 5.00% |  |
Amended Hancock 401K Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Additional matching percentage | 2.00% |  |
Period of employment for eligibility | 3 years |  |
Amended Hancock 401K Plan [Member] | 2% Of Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Matching percentage | 2.00% |  |
Amended Hancock 401K Plan [Member] | 4% Of Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Matching percentage | 4.00% |  |
Amended Hancock 401K Plan [Member] | 6% Of Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Matching percentage | 6.00% |  |
Whitney 401K Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 18,800,000 | $ 17,800,000 | $ 17,900,000
Minimum age for increase in per capita cost of health care benefit | 55 years |  |
Years of credited service reaching 55 years of age | 10 years |  |
Hancock Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum age for increase in per capita cost of health care benefit | 55 years |  |
Years of credited service reaching 55 years of age | 10 years |  |
Increase (decrease) in pre- and post-Medicare age health costs rate | 7.50% |  |
Increased (decreased) pre- and post-Medicare age health costs rate | 8.00% |  |
Period of assumed health rate decline | 3 years |  |
Decrease in ultimate rate over a period of time | 5.75% |  |
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributed to pension plan | $ 0 | 0 |
Employer contributions | 1,320,000 | 1,264,000 |
Funded status at end of year-net asset (liability) | 281,094,000 | $ 248,589,000 |
Excess of plan assets over the benefit obligation | 292,400,000 |  |
Unfunded benefit obligation | $ 11,300,000 |  |

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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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