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Retirement Benefit Plans (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) Participant | Dec. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Newly eligible associates initial savings rate | 3.00% |  |
Eligible participants under VERIP | Participant |  | 260 |
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 | $ 17,300,000 | $ 16,600,000 | $ 17,400,000
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 | 6.50% |  |
Period of assumed health rate decline | 3 years |  |
Decrease in ultimate rate over a period of time | 5.20% |  |
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributed to pension plan | $ 0 | 0 |
Employer contributions | 1,150,000 | 1,181,000 |
Funded status at end of year-net asset (liability) | 204,789,000 | $ 213,051,000 |
Excess of plan assets over the benefit obligation | 216,800,000 |  |
Unfunded benefit obligation | $ 12,000,000.0 |  |

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