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Retirement Plans | 9 Months Ended
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Sep. 30, 2016
Retirement Plans [Abstract] |
Retirement Plans | 11. Retirement Plans The Company has a qualified defined benefit pension plan covering all eligible employees. Eligibility is based on minimum age-related and service-related requirements as well as job classification. Accrued benefits under a nonqualified plan covering certain legacy Whitney employees were frozen as of December 31, 2012 and no future benefits will be accrued under this plan. The Company also sponsors defined benefit postretirement plans for both legacy Hancock and legacy Whitney employees that provide health care and life insurance benefits. Benefits under the Hancock plan are not available to employees hired on or after January 1, 2000. Benefits under the Whitney plan are restricted to retirees who were already receiving benefits at the time of plan amendments in 2007 or active participants who were eligible to receive benefits as of December 31, 2007. The following tables show the components of net periodic benefits cost included in expense for the plans for the periods indicated. ﻿ ﻿
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﻿ |  |  |  |  |  |  |  | Other Post-
﻿(in thousands) |  | Pension Benefits |  | retirement Benefits
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﻿Three Months Ended September 30, 2016 |  | 2016 |  | 2015 |  | 2016 |  | 2015
﻿Service cost |  | $ | 3,611 |  | $ | 3,383 |  | $ | 45 |  | $ | 23
﻿Interest cost |  |  | 4,022 |  |  | 4,672 |  |  | 204 |  |  | 174
﻿Expected return on plan assets |  |  | (8,554) |  |  | (8,207) |  |  | — |  |  | —
﻿Amortization of net loss |  |  | 1,426 |  |  | 842 |  |  | 53 |  |  | (40)
﻿Net periodic benefit cost |  | $ | 505 |  | $ | 690 |  | $ | 302 |  | $ | 157
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿Nine Months Ended September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |
﻿Service cost |  | $ | 10,487 |  | $ | 10,128 |  | $ | 119 |  | $ | 95
﻿Interest cost |  |  | 13,033 |  |  | 13,963 |  |  | 613 |  |  | 717
﻿Expected return on plan assets |  |  | (25,999) |  |  | (24,626) |  |  | — |  |  | —
﻿Amortization of net loss |  |  | 4,320 |  |  | 2,328 |  |  | 75 |  |  | 45
﻿Net periodic benefit cost |  | $ | 1,841 |  | $ | 1,793 |  | $ | 807 |  | $ | 857
﻿ ﻿ No contribution is required in 2016 to meet minimum funding requirements, and the Company has no plans to make a contribution in the current year. The Company also provides a defined contribution 401(k) retirement benefit plan. Under the plan, the Company matches 100% of the first 1% of compensation saved by a participant, and 50% of the next 5% of compensation saved.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 + Details
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