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Employee Benefit and Deferred Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Information relating to the defined benefit pension plan and post-retirement health and life plans | Information relating to the legacy Renasant defined benefit pension plan (“Pension Benefits - Renasant”), the assumed HeritageBank defined benefit pension plan (“Pension Benefits - HeritageBank”) and post-retirement health and life plan (“Other Benefits”) as of December 31, 2017 and 2016 is as follows:
| Pension Benefits Renasant |  | Pension Benefits HeritageBank(2) |  | Other Benefits
| 2017 |  | 2016 |  | 2016 |  | 2017 |  | 2016
Change in benefit obligation |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 28,012 |  |  | $ | 27,856 |  |  | $ | 12,913 |  |  | $ | 1,566 |  |  | $ | 1,704 |
Service cost | — |  |  | — |  |  | — |  |  | 9 |  |  | 12 |
Interest cost | 1,168 |  |  | 1,216 |  |  | 172 |  |  | 42 |  |  | 58 |
Plan participants’ contributions | — |  |  | — |  |  | — |  |  | 77 |  |  | 76 |
Actuarial loss (gain) | 582 |  |  | (115 | ) |  | (481 | ) |  | (328 | ) |  | (56 | )
Benefits paid | (1,903 | ) |  | (2,018 | ) |  | (22 | ) |  | (196 | ) |  | (228 | )
Settlements(1) | — |  |  | — |  |  | (11,509 | ) |  | — |  |  | — |
Transfer from HeritageBank Pension Plan | — |  |  | 1,073 |  |  | (1,073 | ) |  | — |  |  | — |
Benefit obligation at end of year | $ | 27,859 |  |  | $ | 28,012 |  |  | $ | — |  |  | $ | 1,170 |  |  | $ | 1,566 |
Change in fair value of plan assets |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 25,241 |  |  | $ | 24,434 |  |  | $ | 12,458 |  |  |  |  |
Actual return on plan assets | 3,575 |  |  | 1,752 |  |  | 29 |  |  |  |  |
Contribution by employer | — |  |  | — |  |  | 142 |  |  |  |  |
Benefits paid | (1,903 | ) |  | (2,018 | ) |  | (22 | ) |  |  |  |
Settlements(1) | — |  |  | — |  |  | (11,509 | ) |  |  |  |
Expenses paid from plan trust | — |  |  | — |  |  | (25 | ) |  |  |  |
Transfer from HeritageBank Pension Plan | — |  |  | 1,073 |  |  | (1,073 | ) |  |  |  |
Fair value of plan assets at end of year | $ | 26,913 |  |  | $ | 25,241 |  |  | $ | — |  |  |  |  |
Funded status at end of year | $ | (946 | ) |  | $ | (2,771 | ) |  | $ | — |  |  | $ | (1,170 | ) |  | $ | (1,566 | )
Weighted-average assumptions as of December 31 |  |  |  |  |  |  |  |  |
Discount rate used to determine the benefit obligation | 3.96 | % |  | 4.35 | % |  | — | % |  | 3.37 | % |  | 3.57 | %
(1) | Settlements from the HeritageBank defined benefit pension plan represent the lump sum payments made to participants upon final distribution of benefits as a result of the plan’s termination.
(2) | Because final distribution of all benefits under the HeritageBank defined benefit pension plan was completed in August 2016, there was no impact on the Company’s consolidated financial statements as of and for the year ended December 31, 2017.
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans | The components of net periodic benefit cost and other amounts recognized in other comprehensive income for the defined benefit pension and post-retirement health and life plans for the year ended December 31, 2017, 2016 and 2015 are as follows:
| Pension Benefits Renasant |  | Pension Benefits HeritageBank(1) |  | Other Benefits
| 2017 |  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 9 |  |  | $ | 12 |  |  | $ | 17 |
Interest cost | 1,168 |  |  | 1,216 |  |  | 1,095 |  |  | 172 |  |  | 305 |  |  | 42 |  |  | 58 |  |  | 60 |
Expected return on plan assets | (1,941 | ) |  | (1,872 | ) |  | (2,040 | ) |  | (113 | ) |  | (216 | ) |  | — |  |  | — |  |  | — |
Prior service cost recognized | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Recognized actuarial loss | 401 |  |  | 404 |  |  | 331 |  |  | — |  |  | — |  |  | 6 |  |  | 76 |  |  | 101 |
Settlement/curtailment/termination losses | — |  |  | — |  |  | — |  |  | (780 | ) |  | (65 | ) |  | — |  |  | — |  |  | — |
Net periodic benefit cost | (372 | ) |  | (252 | ) |  | (614 | ) |  | (721 | ) |  | 24 |  |  | 57 |  |  | 146 |  |  | 178 |
Net actuarial loss/(gain) arising during the period | (1,051 | ) |  | 5 |  |  | 2,812 |  |  | (397 | ) |  | (448 | ) |  | (328 | ) |  | (56 | ) |  | (37 | )
Net Settlement/curtailment/termination losses | — |  |  | — |  |  | — |  |  | 780 |  |  | 65 |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss recognized in net periodic pension cost | (401 | ) |  | (404 | ) |  | (331 | ) |  | — |  |  | — |  |  | (6 | ) |  | (76 | ) |  | (101 | )
Total recognized in other comprehensive income | (1,452 | ) |  | (399 | ) |  | 2,481 |  |  | 383 |  |  | (383 | ) |  | (334 | ) |  | (132 | ) |  | (138 | )
Total recognized in net periodic benefit cost and other comprehensive income | $ | (1,824 | ) |  | $ | (651 | ) |  | $ | 1,867 |  |  | $ | (338 | ) |  | $ | (359 | ) |  | $ | (277 | ) |  | $ | 14 |  |  | $ | 40 |
Weighted-average assumptions as of December 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate used to determine net periodic pension cost | 4.35 | % |  | 4.56 | % |  | 4.00 | % |  | 4.27 | % |  | 4.00 | % |  | 3.57 | % |  | 3.63 | % |  | 3.22 | %
Expected return on plan assets | 8.00 | % |  | 8.00 | % |  | 8.00 | % |  | 3.00 | % |  | 3.00 | % |  | N/A |  |  | N/A |  |  | N/A |
(1) | Because final distribution of all benefits under the HeritageBank defined benefit pension plan was completed in August 2016, there was no impact on the Company’s consolidated financial statements as of and for the year ended December 31, 2017.
Future estimated benefit payments under the defined benefit pension plan and post-retirement health and life plan | Future estimated benefit payments under the Renasant defined benefit pension plan and post-retirement health and life plan are as follows:
| Pension Benefits Renasant |  | Other Benefits
2018 | $ | 2,019 |  |  | $ | 214 |
2019 | 2,036 |  |  | 182 |
2020 | 2,043 |  |  | 151 |
2021 | 2,048 |  |  | 148 |
2022 | 2,033 |  |  | 120 |
2023 - 2027 | 9,659 |  |  | 386 |
Amounts recognized in accumulated other comprehensive income, net of tax | Amounts recognized in accumulated other comprehensive income, before tax, for the year ended December 31, 2017 are as follows:
| Pension Benefits Renasant |  | Other Benefits
Prior service cost | $ | — |  |  | $ | — |
Actuarial loss | 10,063 |  |  | 85 |
Total | $ | 10,063 |  |  | $ | 85 |
Estimated costs that will be amortized from accumulated other comprehensive income into net periodic cost | The estimated costs that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year are as follows:
| Pension Benefits Renasant |  | Other Benefits
Prior service cost | $ | — |  |  | $ | — |
Actuarial loss | 349 |  |  | — |
Total | $ | 349 |  |  | $ | — |
Fair values of defined benefit pension plan assets by category of the firm | The fair values of these instruments are based on quoted market prices of similar instruments or a discounted cash flow model (Level 2).
| Quoted Prices In Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Totals
December 31, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 387 |  |  | $ | — |  |  | $ | — |  |  | $ | 387 |
U.S. government securities | — |  |  | 2,496 |  |  | — |  |  | 2,496 |
Corporate debt | — |  |  | 1,908 |  |  | — |  |  | 1,908 |
Corporate stocks | 20,557 |  |  | — |  |  | — |  |  | 20,557 |
Investments in registered investment companies | 921 |  |  | — |  |  | — |  |  | 921 |
Foreign obligations | — |  |  | 644 |  |  | — |  |  | 644 |
| $ | 21,865 |  |  | $ | 5,048 |  |  | $ | — |  |  | $ | 26,913 |
| Quoted Prices In Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Totals
December 31, 2016 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 1,639 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,639 |
U.S. government securities | — |  |  | 2,270 |  |  | — |  |  | 2,270 |
Corporate debt | — |  |  | 1,991 |  |  | — |  |  | 1,991 |
Corporate stocks | 17,823 |  |  | — |  |  | — |  |  | 17,823 |
Investments in registered investment companies | 871 |  |  | — |  |  | — |  |  | 871 |
Foreign obligations | — |  |  | 647 |  |  | — |  |  | 647 |
| $ | 20,333 |  |  | $ | 4,908 |  |  | $ | — |  |  | $ | 25,241 |
Summarizes information about options issued under the long-term equity incentive plan | n March 2011, the Company adopted a long-term equity incentive plan, which provides for the grant of stock options and the award of restricted stoc
Summary of the changes in restricted stock | The following table summarizes the changes in restricted stock as of and for the year ended December 31, 2017:
| Performance- Based Restricted Stock(1) |  | Weighted Average Grant-Date Fair Value |  | Time- Based Restricted Stock |  | Weighted Average Grant-Date Fair Value
Nonvested at beginning of year | — |  |  | $ | — |  |  | 117,345 |  |  | $ | 31.76 |
Granted | 57,204 |  |  | 42.22 |  |  | 153,270 |  |  | 42.81 |
Vested | (55,204 | ) |  | 42.22 |  |  | (43,305 | ) |  | 32.36 |
Cancelled | (2,000 | ) |  | 42.22 |  |  | (9,235 | ) |  | 39.49 |
Nonvested at end of year | — |  |  | $ | — |  |  | 218,075 |  |  | $ | 39.08 |
(1) In January 2017, the Company awarded 54,450 shares of performance-based restricted stock based on the target level of performance goals of which 2,000 were cancelled prior to the attainment of performance goals. The Company exceeded the financial performance measures for the award; therefore, an additional 2,754 shares were issued for a total award of 55,204 shares.

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- Definition Defined benefit plan amounts that will be amortized from accumulated other comprehensive income loss in next fiscal year. + References No definition available. + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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